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Faisal, Abrar
Publications (10 of 13) Show all publications
Amjad, U.-e., Tajjamal, A., Ul-Hamid, A., Faisal, A., Zaidi, S. A., Sherin, L., . . . Park, Y.-K. (2022). Catalytic cracking of polystyrene pyrolysis oil: Effect of Nb2O5 and NiO/Nb2O5 catalyst on the liquid product composition. Waste Management, 141, 240-250
Open this publication in new window or tab >>Catalytic cracking of polystyrene pyrolysis oil: Effect of Nb2O5 and NiO/Nb2O5 catalyst on the liquid product composition
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2022 (English)In: Waste Management, ISSN 0956-053X, E-ISSN 1879-2456, Vol. 141, p. 240-250Article in journal (Refereed) Published
Abstract [en]

The catalytic cracking of polystyrene pyrolysis oil was investigated over a Nb2O5 and a NiO/Nb2O5 catalyst in a fixed bed reactor. First, the pyrolysis of two different polystyrene feedstock (polystyrene foam and polystyrene pellet) was carried out in a semi-batch reactor, and the resulting polystyrene pellets pyrolysis oil was selected for catalytic cracking reaction because of its high liquid yield (85%). Catalytic cracking experiments were then performed at different temperatures (350–500 °C) using Nb2O5 or NiO/Nb2O5 catalyst. Gas chromatography–mass spectrometry analysis of liquid product obtained from the catalytic cracking process showed that the dimers in the pyrolysis oil were converted to monomers during the catalytic cracking process. The catalytic cracking results also showed that the NiO/Nb2O5 catalyst (having slightly higher acidic sites) had slightly higher activity for monomer conversion than the Nb2O5 catalyst (having less acidic sites). X-ray diffraction, transmission electron microscopy, pyridine Fourier transform infrared spectroscopy, NH3 Temperature Programmed Desorption and X-ray photoelectron spectroscopy were used to characterize the catalyst. The highest catalytic cracking activity was observed at 400 °C with the Nb2O5 catalyst with 4% toluene, 6% ethylbenzene, approximately 50% styrene, 13% α-methyl styrene, and only 6% of dimers in the liquid oil. The increase in temperature positively affected the yield of gases during catalytic cracking process.

Place, publisher, year, edition, pages
Elsevier, 2022
Keywords
Pyrolysis, Catalytic Cracking, Acid catalyst, Polystyrene, Plastic waste
National Category
Energy Engineering Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-89556 (URN)10.1016/j.wasman.2022.02.002 (DOI)000784289000015 ()35150974 (PubMedID)2-s2.0-85124243296 (Scopus ID)
Note

Validerad;2022;Nivå 2;2022-03-14 (joosat);

Funder: Higher Education Commission of Pakistan (HEC), (7869/Federal/NRPU/R&D/HEC/2017); The World Academy of Sciences (TWAS), (17-028 RG/ENG/AS_C – FR3240300052); Ministry of Trade, Industry & Energy (MOTIE, Korea), (20015401); National Research Foundation of Korea (NRF-2021R1A2C3011274)

Available from: 2022-03-14 Created: 2022-03-14 Last updated: 2022-05-09Bibliographically approved
Hedlund, J., Zhou, M., Faisal, A., Öhrman, O. G. .., Finelli, V., Signorile, M., . . . Grahn, M. (2022). Controlling diffusion resistance, selectivity and deactivation of ZSM-5 catalysts by crystal thickness and defects. Journal of Catalysis, 410, 320-332
Open this publication in new window or tab >>Controlling diffusion resistance, selectivity and deactivation of ZSM-5 catalysts by crystal thickness and defects
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2022 (English)In: Journal of Catalysis, ISSN 0021-9517, E-ISSN 1090-2694, Vol. 410, p. 320-332Article in journal (Refereed) Published
Abstract [en]

A systematic investigation of two sets of defect free and defective ZSM-5 crystals with controlled thickness (T) between 30 and 400 nm and of their performances in methanol conversion was reported for the first time in the present work. The defect free ZSM-5 crystals with a thickness of 35 nm are by far the smallest ever reported and displayed superior activity, stability and selectivity to slower diffusing compounds, which resulted in high yield of e.g. gasoline and the 1,2,4-trimethylbenzene isomer with high octane number, as compared to the other studied catalysts. Almost only products forming in the zeolite pores were detected and consequently, the external surface must be nearly inactive. Strong correlations between T and deactivation rate were observed. Thick crystals deactivated much faster than thin crystals, probably due to formation of carbon species in the zeolite pores, which results in pronounced percolation effects and faster deactivation of the former. At comparable thickness, crystals with defects deactivated much faster than defect free crystals, due to formation of additional small molecular coke species in the former. Strong correlations between T and selectivity were also observed and assigned to control of diffusion resistance by crystal thickness.

Place, publisher, year, edition, pages
Elsevier, 2022
Keywords
H-ZSM-5, Defects, Gasoline, Deactivation, MTG
National Category
Chemical Process Engineering Biochemistry and Molecular Biology
Research subject
Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-90477 (URN)10.1016/j.jcat.2022.04.013 (DOI)000799277700003 ()2-s2.0-85129698365 (Scopus ID)
Funder
Swedish Research Council, 2014-04585_VRBio4EnergySwedish Energy Agency, P41164-1
Note

Validerad;2022;Nivå 2;2022-06-01 (hanlid)

Available from: 2022-05-02 Created: 2022-05-02 Last updated: 2023-09-05Bibliographically approved
Hassan, M., Faisal, A., Javid, K., Khan, S., Ahmad, A. & Khan, R. (2022). The Impact of Different Arrangements of Molecular Chains in Terms of Low and High Shear Rate’s Viscosities on Heat and Mass Flow of Nonnewtonian Shear thinning Fluids. Combinatorial chemistry & high throughput screening, 25(7), 1115-1126
Open this publication in new window or tab >>The Impact of Different Arrangements of Molecular Chains in Terms of Low and High Shear Rate’s Viscosities on Heat and Mass Flow of Nonnewtonian Shear thinning Fluids
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2022 (English)In: Combinatorial chemistry & high throughput screening, ISSN 1386-2073, E-ISSN 1875-5402, Vol. 25, no 7, p. 1115-1126Article in journal (Refereed) Published
Abstract [en]

Background: Non-newtonian fluids, especially shear thinning fluids, have several applications in the polymer industry, food industry, and even everyday life. The viscosity of shear thinning fluids is decreased by two or three orders of magnitude due to the alignment of the molecules in order when the shear rate is increased, and it cannot be ignored in the case of polymer processing and lubrication problems.

Objective: So, the effects of viscosities at the low and high shear rates on the heat and mass boundary layer flow of shear thinning fluid over moving belts are investigated in this study. For this purpose the generalized Carreau model of viscosity relate to shear rate is used in the momentum equation. The Carreau model contains the five parameters: low shear rate viscosity, high shear rate viscosity, viscosity curvature, consistency index, and flow behavior index. For the heat flow, the expression of the thermal conductivity model similar to the viscosity equation due to the non-Newtonian nature of the fluid is used in the energy equation.

Methods: On the mathematical model of the problem, boundary layer approximations are applied and then simplified by applying the similarity transformations to get the solution. The solution of the simplified equations is obtained by numerical technique RK-shooting method. The results are compared with existing results for limited cases and found good agreement.

Results: The results in the form of velocity and temperature profiles under the impact of all the viscosity’s parameters are obtained and displayed in graphical form. Moreover, the boundary layer parameters such as the thickness of the regions, momentum thickness, and displacement thickness are calculated to understand the structure of the boundary layer flow of fluid.

Conclusion: The velocity and temperature of the fluid are decreased and increased respectively by all viscosity’s parameters of the model. So, the results of the boundary layer fluid flow under rheological parameters will not only help engineers to design superior chemical equipment but also help improve the economy and efficiency of the overall process.

Place, publisher, year, edition, pages
Bentham Science Publishers, 2022
Keywords
Low and high shear rates viscosities, shear thinning fluid flow, five parameters contained carreau model, heat and mass flow, polymer industry, temperature of the fluid
National Category
Computational Mathematics Geotechnical Engineering
Research subject
Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-90944 (URN)10.2174/1386207324666210719111909 (DOI)000838052200003 ()34554900 (PubMedID)2-s2.0-85130823648 (Scopus ID)
Note

Validerad;2022;Nivå 2;2022-06-03 (joosat);

Available from: 2022-06-03 Created: 2022-06-03 Last updated: 2022-09-05Bibliographically approved
Hassan, M., Mebarek-Oudina, F., Faisal, A., Ghafar, A. & Ismail, A. (2022). Thermal Energy and Mass Transport of Shear Thinning Fluid under Effects of Low to High Shear Rate Viscosity. International Journal of Thermofluids, 15, Article ID 100176.
Open this publication in new window or tab >>Thermal Energy and Mass Transport of Shear Thinning Fluid under Effects of Low to High Shear Rate Viscosity
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2022 (English)In: International Journal of Thermofluids, ISSN 2666-2027, Vol. 15, article id 100176Article in journal (Refereed) Published
Abstract [en]

The current investigation is deliberated the flow and heat transfer of a shear thinning fluid over a non-linear stretching sheet has variable thickness. All rheological aspects at low to high shear rates are accounted theoretical by using generalized Carreau model of viscosity. Theoretical flow model is formulated for boundary layer phenomena by applying boundary layer approximations and then convert it from partial differential equations to ordinary differential equations with the help of similarity transformations. The solution is obtained by numerical method and the result are displayed in the form of velocity and temperature profiles under impact of rheological and geometrical governing parameters. In addition, the results of skin friction coefficient and Nusselt number are obtained under effects of these parameters. It is found that Nusselt number is significantly decreased when stretching is increased by velocity index parameter.

Place, publisher, year, edition, pages
Elsevier, 2022
Keywords
Shear thinning fluid, Generalized Carreau model, Viscosity effects, Variable thicker stretching sheet, velocity and thermal boundary layer flow
National Category
Other Chemical Engineering
Research subject
Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-92029 (URN)10.1016/j.ijft.2022.100176 (DOI)2-s2.0-85133257144 (Scopus ID)
Note

Godkänd;2022;Nivå 0;2022-12-02 (sofila); Funder: Deanship of Scientific Research, Umm Al-Qura University (grant no. 22UQU4240002DSR06) 

Available from: 2022-07-01 Created: 2022-07-01 Last updated: 2022-12-02Bibliographically approved
Grahn, M., Faisal, A., Öhrman, O. G. ., Zhou, M., Signorile, M., Crocellà, V., . . . Hedlund, J. (2020). Small ZSM-5 crystals with low defect density as an effective catalyst for conversion of methanol to hydrocarbons. Paper presented at 8th Czech-Italian-Spanish Symposium on Zeolites and Catalysis, JUN, 2019, Amantea, ITALY. Catalysis Today, 345, 136-146
Open this publication in new window or tab >>Small ZSM-5 crystals with low defect density as an effective catalyst for conversion of methanol to hydrocarbons
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2020 (English)In: Catalysis Today, ISSN 0920-5861, E-ISSN 1873-4308, Vol. 345, p. 136-146Article in journal (Refereed) Published
Abstract [en]

This work presents the synthesis of nearly defect-free ZSM-5 nanosized crystals, prepared in fluoride medium by seeding with silicalite-1. This material was carefully characterized and its catalytic performances in the methanol to hydrocarbons (MTH) reaction were assessed. Such fluoride-based material was compared to a reference ZSM-5, produced through a conventional alkaline synthesis but from the same seeding. Despite both the materials show closely identical morphology and they have a comparable acid site population, the catalyst prepared using the fluoride route showed significantly longer lifetime in MTH compared to the catalyst prepared using conventional synthesis at high pH. The slower deactivation for the samples prepared using the fluoride route was ascribed, thanks to a thorough in situ IR spectroscopy study, to its lower density of internal defects. According to the UV-Raman characterization of coke on the spent catalyst, the fluoride-based ZSM-5 catalyst produces less molecular coke species, most probably because of the absence of enlarged cavities/channels as due to the presence of internal defects. On the basis of these observations, the deactivation mechanism in the ZSM-5 synthesized by fluoride medium could be mostly related to the deposition of an external layer of bulk coke, whereas in the alkali-synthesized catalyst an additional effect from molecular coke accumulating within the porous network accelerates the deactivation process.

Place, publisher, year, edition, pages
Elsevier, 2020
Keywords
ZSM-5, defects, hydrocarbons, deactivation, MTH, IR spectroscopy, OH groups
National Category
Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-76102 (URN)10.1016/j.cattod.2019.09.023 (DOI)000522039100016 ()2-s2.0-85073006485 (Scopus ID)
Conference
8th Czech-Italian-Spanish Symposium on Zeolites and Catalysis, JUN, 2019, Amantea, ITALY
Note

Godkänd;2020;Nivå 0;2020-04-20 (alebob);Konferensartikel i tidskrift

Available from: 2019-09-24 Created: 2019-09-24 Last updated: 2023-09-05Bibliographically approved
Hassan, M., Faisal, A., Ali, I., Bhatti, M. M. & Yousaf, M. (2019). Effects of Cu–Ag hybrid nanoparticles on the momentum and thermal boundary layer flow over the wedge. Proceedings of the Institution of mechanical engineers. Part E, journal of process mechanical engineering, 233(5), 1128-1136
Open this publication in new window or tab >>Effects of Cu–Ag hybrid nanoparticles on the momentum and thermal boundary layer flow over the wedge
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2019 (English)In: Proceedings of the Institution of mechanical engineers. Part E, journal of process mechanical engineering, ISSN 0954-4089, E-ISSN 2041-3009, Vol. 233, no 5, p. 1128-1136Article in journal (Refereed) Published
Abstract [en]

In this work, the effects of hybrid nanoparticles on the momentum and thermal boundary layers as well as flow characteristics and thermal performance of the hybrid nanofluid are investigated over the wedge. The fluid in the enclosure is water containing hybrid nanoparticles Cu–Ag. The physical model of homogenous hybrid nanofluid is derived using the elementary equations of thermo-hydrodynamic and co-relation's model of a mixture that supports the effective physical features. The results are calculated to measure the effects of nanoparticle concentration on thermal and momentum boundary layers and displayed in graphs for discussions. In addition, the effects of nanoparticles concentration and different compositions of hybrid nanoparticles on temperature and velocity profiles, physical properties, skin friction, and convective heat transfer coefficient are deliberated through graphs and tables. To check its heat transfer performance, a comparison of hybrid nanofluid is made between the base fluid and single material nanofluids. It is found that the efficiency of hybrid nanofluids as a heat transfer fluid is much more than conventional fluids or single nanoparticles-based nanofluids. These results in terms of boundary layers phenomena, heat transfer performance, and temperature and velocity profiles under hybrid nanomaterial could help chemical engineers to design the critical equipment in a process industry such as heat exchangers and pumps and others.

Place, publisher, year, edition, pages
Sage Publications, 2019
Keywords
Hybrid nanofluid, thermal boundary layer, momentum boundary layer, heat transfer performance, flow characteristics
National Category
Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-74911 (URN)10.1177/0954408919844668 (DOI)000483609400017 ()2-s2.0-85064940518 (Scopus ID)
Note

Validerad;2019;Nivå 2;2019-09-11 (johcin)

Available from: 2019-06-24 Created: 2019-06-24 Last updated: 2019-10-07Bibliographically approved
Faisal, A., Holmlund, M., Ginesy, M., Holmgren, A., Enman, J., Hedlund, J. & Grahn, M. (2019). Recovery of l-Arginine from Model Solutions and Fermentation Broth Using Zeolite-Y Adsorbent. ACS Sustainable Chemistry and Engineering, 7(9), 8900-8907
Open this publication in new window or tab >>Recovery of l-Arginine from Model Solutions and Fermentation Broth Using Zeolite-Y Adsorbent
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2019 (English)In: ACS Sustainable Chemistry and Engineering, E-ISSN 2168-0485, Vol. 7, no 9, p. 8900-8907Article in journal (Refereed) Published
Abstract [en]

Arginine was produced via fermentation of sugars using the engineered microorganism Escherichia coli. Zeolite-Y adsorbents in the form of powder and extrudates were used to recover arginine from both a real fermentation broth and aqueous model solutions. An adsorption isotherm was determined using model solutions and zeolite-Y powder. The saturation loading was determined to be 0.2 g/g using the Sips model. Arginine adsorbed from a real fermentation broth using either zeolite-Y powder or extrudates both showed a maximum loading of 0.15 g/g at pH 11. This adsorbed loading is very close to the corresponding value obtained from the model solution showing that under the experimental conditions the presence of additional components in the broth did not have a significant effect on the adsorption of arginine. Furthermore, a breakthrough curve was determined for extrudates using a 1 wt % arginine model solution. The selectivity for arginine over ammonia and alanine from the real fermentation broth at pH 11 was 1.9 and 8.3, respectively, for powder, and 1.0, and 4.1, respectively, for extrudates. To the best of our knowledge, this is the first time recovery of arginine from real fermentation broths using any type of adsorbent has been reported.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2019
Keywords
Arginine, FAU, Fermentation broth, Escherichia coli, Adsorption, Selectivity, Breakthrough
National Category
Chemical Process Engineering Bioprocess Technology
Research subject
Chemical Technology; Biochemical Process Engineering
Identifiers
urn:nbn:se:ltu:diva-73954 (URN)10.1021/acssuschemeng.9b00918 (DOI)000467351200095 ()2-s2.0-85065476739 (Scopus ID)
Note

Validerad;2019;Nivå 2;2019-05-27 (oliekm)

Available from: 2019-05-15 Created: 2019-05-15 Last updated: 2023-09-05Bibliographically approved
Faisal, A., Zhou, M., Hedlund, J. & Grahn, M. (2016). Erratum to: Recovery of butanol from model ABE fermentation broths Using MFI adsorbent: A comparison between traditional beads and a structured adsorbent in the form of a film (ed.). Adsorption, 22(3), 409
Open this publication in new window or tab >>Erratum to: Recovery of butanol from model ABE fermentation broths Using MFI adsorbent: A comparison between traditional beads and a structured adsorbent in the form of a film
2016 (English)In: Adsorption, ISSN 0929-5607, E-ISSN 1572-8757, Vol. 22, no 3, p. 409-Article in journal (Other academic) Published
National Category
Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-12599 (URN)10.1007/s10450-016-9782-0 (DOI)000372598400012 ()2-s2.0-84959342163 (Scopus ID)bc25ce80-746d-4076-8012-2125f597034d (Local ID)bc25ce80-746d-4076-8012-2125f597034d (Archive number)bc25ce80-746d-4076-8012-2125f597034d (OAI)
Note

Godkänd; 2016; 20160307 (andbra);

Erratum in: Adsorption, vol. 22, iss. 2, p. 205–214. DOI: 10.1007/s10450-016-9759-z

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2023-09-05Bibliographically approved
Faisal, A., Zhou, M., Hedlund, J. & Grahn, M. (2016). Recovery of butanol from model ABE fermentation broths Using MFI adsorbent: A comparison between traditional beads and a structured adsorbent in the form of a film (ed.). Adsorption, 22(2), 205-214
Open this publication in new window or tab >>Recovery of butanol from model ABE fermentation broths Using MFI adsorbent: A comparison between traditional beads and a structured adsorbent in the form of a film
2016 (English)In: Adsorption, ISSN 0929-5607, E-ISSN 1572-8757, Vol. 22, no 2, p. 205-214Article in journal (Refereed) Published
Abstract [en]

Butanol, a promising biofuel, can be produced by ABE (acetone, butanol and ethanol) fermentation using e.g. Clostridium acetobutylicum. However, the butanol concentration in the resulting broth is limited to only ca. 20 g/L due to the toxicity for the microorganisms. This low product concentration demands an efficient recovery process for successful commercialization of this process. In this study, a structured adsorbent in the form of steel monolith coated with a silicalite-1 film was prepared using the in situ growth method. The adsorbent was carefully characterized by SEM and XRD. The performance of the adsorbent was evaluated by performing breakthrough experiments at room temperature using model ABE fermentation broths and the performance was compared with that of traditional adsorbents in the form of beads. The structured silicalite-1 adsorbent showed less saturation loading time as compared to commercial binder free silicalite-1 beads, reflecting the different dimensions of the columns used, set by experimental constraints. Studies of the desorption process showed that by operating at appropriate conditions, butanol with high concentration i.e. up to 95.2 wt% for butanol–water model system and 88.5 wt% for ABE fermentation broth can be obtained using the structured silicalite-1 adsorbent. Commercial silicalite-1 beads also showed good selectivity but the concentration of butanol in the desorbed product was limited to 70 % for the butanol–water model system and 69 % for ABE fermentation broth, probably as a result of entrained liquid between the beads.

National Category
Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-9027 (URN)10.1007/s10450-016-9759-z (DOI)000371234200010 ()2-s2.0-84957434968 (Scopus ID)79653da1-6c61-431c-bf70-59c334e8bd7f (Local ID)79653da1-6c61-431c-bf70-59c334e8bd7f (Archive number)79653da1-6c61-431c-bf70-59c334e8bd7f (OAI)
Note

Validerad; 2016; Nivå 2; 20160105 (magr)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2023-09-05Bibliographically approved
Faisal, A. (2016). Zeolite adsorbents and catalysts for the recovery and production of biochemicals. (Doctoral dissertation). Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>Zeolite adsorbents and catalysts for the recovery and production of biochemicals
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Alternative title[sv]
Zeolitadsorbenter och katalysatorer för separation och produktion av biokemikalier
Abstract [en]

Fossil based energy resources are dominating the world’s primary energy consumption for the last century. However, with decreasing crude oil reservoirs and the role they play in global warming by emitting greenhouse gases, the focus has been turned towards improved utilization of renewable resources and the need for new, sustainable fuels and chemicals is more urgent than ever. Biomass is a carbon neutral resource that can be used to produce biofuels and other useful chemicals. One such chemical is 1-butanol (or simply butanol), which has great potential as a gasoline substitute because of its favorable fuel properties. Butanol can be produced from acetone, butanol and ethanol (ABE) fermentation using e.g. Clostridium acetobutylicum. However, the concentration of butanol in fermentation in the resulting broth is limited to ca. 20 g/L due to its toxicity for microorganisms. Butyric acid is a precursor to butanol, which is produced prior to butanol in ABE fermentation. Butyric acid is an important industrial chemical, which can be further converted into a number of commercial compounds e.g. acetate butyrate, butyl acetate and butanol. Arginine is a semi-essential amino acid that has vast applications in the field of pharmaceutical and food industry. In addition, arginine can replace inorganic nitrogen as nitrogen source in fertilizers. It can be produced via fermentation of sugars using engineered microorganism like E. Coli, but like butanol its concentration is restricted to approximately 12 g/L. Due to low concentration of these useful chemicals in the resulting fermentation broths recovery of these chemicals remain challenging with today’s options and therefore  novel recovery process should be developed.

In this study, zeolite adsorbents were used to recover butanol, butyric acid and arginine from model and real fermentation broths. Zeolite MFI adsorbent efficiently adsorbed butanol from model solutions with a saturation loading of 0.11 g/g- zeolite. On the other hand, adsorption of butyric acid was found to be strongly pH dependent, with high adsorption below and little adsorption above the pKa value of the acid. A structured adsorbent in the form of steel monolith coated with a silicalite-1 film was also used and performance was evaluated by performing breakthrough experiments at room temperature using model ABE fermentation broths and the results were compared with those obtained using traditional adsorbent sin the form of beads. Desorption studies showed that a high quality butanol product with purity up to 95.2% for butanol-water system and 88.5% for the ABE system can be recovered with the structured silicalite-1 adsorbent. Further, zeolite X adsorbents in the form of powder and extrudates was used to recover arginine from a real fermentation broth and also from aqueous model solutions. To the best of our knowledge, this is the first time recovery of arginine from real fermentation broths using any type of adsorbent is reported. Arginine loading of 0.15 g/g was observed at pH 11 using zeolite X powder. The selectivity for arginine over ammonia and alanine from the fermentation broth at pH 11 was 1.9 and 8.3, respectively, for powder and 1.0 and 4.1, respectively, for extrudates. Synthesis gas (CO + H2) can be produced e.g.by gasification of lignocellulose biomass. This synthesis gas can be used to produce methanol, which subsequently may be converted into gasoline using zeolite ZSM-5 catalyst. However, during Methanol to Gasoline (MTG) process, undesirable carbon residue (coke) is formed that gradually reduces the activity of catalyst. It was hypothesized that intracrystalline defects in the zeolite formed during conventional synthesis may accelerate the deactivation rate by coke formation. In this work, a novel ZSM-5 zeolite catalyst essentially free of intracrystalline defects was synthesized and evaluated in the  MTG reaction,. The novel catalyst showed significantly higher resistance towards deactivation by coke formation as compared to a reference catalyst containing defects. 

Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2016. p. 50
Keywords
Zeolites, Adsorbents, Catalyst, Butanol, Arginine, ZSM-5
National Category
Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
urn:nbn:se:ltu:diva-60137 (URN)978-91-7583-743-7 (ISBN)978-91-7583-744-4 (ISBN)
Public defence
2016-12-09, A1545, Luleå tekniska universtitet, LULEÅ, 10:00 (English)
Supervisors
Available from: 2016-11-03 Created: 2016-11-03 Last updated: 2019-04-03Bibliographically approved
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