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Kinetic study of catalytic gasification of wood char impregnated with different alkali salts
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.ORCID-id: 0000-0002-8235-9839
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Energivetenskap.
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Kemiteknik.ORCID-id: 0000-0002-3687-6173
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Kemiteknik.ORCID-id: 0000-0003-0079-5950
Vise andre og tillknytning
Rekke forfattare: 62017 (engelsk)Inngår i: Energy, ISSN 0360-5442, E-ISSN 1873-6785, Vol. 118, s. 1055-1065Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Different concentrations (0.1 and 1 M K+/Na+) of salt solutions (K2CO3, Na2CO3, NaOH and NaCl) were used to impregnate alkali in sawdust. After devolatilization, char samples were gasified at different temperatures (750–900 °C) under CO2 in a macro-thermogravimetric analyzer for gasification kinetics. Morphologically, three classes of chars could be identified. Chars experiencing the highest catalytic influence were in Class-2 (0.5 M K2CO3 and 1 M NaOH) with a swollen and molten surface. In contrast, Class-1 (wood char like) and Class-3 (with salt deposits) chars showed moderate and low catalytic effect on gasification reactivity respectively. It is believed to be related to char surface swelling and alkali salt used. At 850 °C or below, the reactivity increased linearly (Class-1 and Class-3 Char) with initial alkali content up to 2200 mmol alkali/kg of char (except for NaCl). The same reaction rate was maintained until 3600 mmol/kg of char of alkali loading (Class-2) and then decreased. However, no trend was observed at 900 °C due to drastic change in reactivity of the samples, probably due to alkali transformation. Among the salts, K2CO3 (0.5 M) was found to be the most suitable for catalytic gasification due to its high catalytic activity in combination with relatively low carbon leaching.

sted, utgiver, år, opplag, sider
Elsevier, 2017. Vol. 118, s. 1055-1065
Emneord [en]
Gasification, Catalytic, Biomass, Morphology, Kinetics
HSV kategori
Forskningsprogram
Energiteknik; Biokemisk processteknik
Identifikatorer
URN: urn:nbn:se:ltu:diva-60324DOI: 10.1016/j.energy.2016.10.134ISI: 000395048900090Scopus ID: 2-s2.0-85010831596OAI: oai:DiVA.org:ltu-60324DiVA, id: diva2:1045968
Prosjekter
Catalytic Gasification Project (as part of LTU BioSyngas Program)
Forskningsfinansiär
Swedish Energy Agency, 38026-1
Merknad

Validerad; 2017; Nivå 2; 2017-02-07 (andbra)

Tilgjengelig fra: 2016-11-11 Laget: 2016-11-11 Sist oppdatert: 2023-09-05bibliografisk kontrollert

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Kirtania, KawnishMatsakas, LeonidasChristakopoulos, PaulUmeki, KentaroFurusjö, Erik

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