Catalytic Fast Pyrolysis of Lignin Isolated by Hybrid Organosolv—Steam Explosion Pretreatment of Hardwood and Softwood Biomass for the Production of Phenolics and AromaticsShow others and affiliations
2019 (English)In: Catalysts, E-ISSN 2073-4344, Vol. 9, no 11, article id 935Article in journal (Refereed) Published
Abstract [en]
Lignin, one of the three main structural biopolymers of lignocellulosic biomass, is the most abundant natural source of aromatics with a great valorization potential towards the production of fuels, chemicals, and polymers. Although kraft lignin and lignosulphonates, as byproducts of the pulp/paper industry, are available in vast amounts, other types of lignins, such as the organosolv or the hydrolysis lignin, are becoming increasingly important, as they are side-streams of new biorefinery processes aiming at the (bio)catalytic valorization of biomass sugars. Within this context, in this work, we studied the thermal (non-catalytic) and catalytic fast pyrolysis of softwood (spruce) and hardwood (birch) lignins, isolated by a hybrid organosolv–steam explosion biomass pretreatment method in order to investigate the effect of lignin origin/composition on product yields and lignin bio-oil composition. The catalysts studied were conventional microporous ZSM-5 (Zeolite Socony Mobil–5) zeolites and hierarchical ZSM-5 zeolites with intracrystal mesopores (i.e., 9 and 45 nm) or nano-sized ZSM-5 with a high external surface. All ZSM-5 zeolites were active in converting the initially produced via thermal pyrolysis alkoxy-phenols (i.e., of guaiacyl and syringyl/guaiacyl type for spruce and birch lignin, respectively) towards BTX (benzene, toluene, xylene) aromatics, alkyl-phenols and polycyclic aromatic hydrocarbons (PAHs, mainly naphthalenes), with the mesoporous ZSM-5 exhibiting higher dealkoxylation reactivity and being significantly more selective towards mono-aromatics compared to the conventional ZSM-5, for both spruce and birch lignin.
Place, publisher, year, edition, pages
MDPI, 2019. Vol. 9, no 11, article id 935
Keywords [en]
spruce and birch wood lignin, hybrid organosolv—steam explosion pretreatment, catalytic fast pyrolysis, model compounds, bio-oil, phenolics and aromatics, microporous and hierarchical ZSM-5 zeolite
National Category
Bioprocess Technology
Research subject
Biochemical Process Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-76789DOI: 10.3390/catal9110935ISI: 000502278800061Scopus ID: 2-s2.0-85074766498OAI: oai:DiVA.org:ltu-76789DiVA, id: diva2:1371631
Note
Validerad;2019;Nivå 2;2019-11-20 (johcin)
2019-11-202019-11-202023-09-05Bibliographically approved