Performance of MCM-22 zeolite for the catalytic fast-pyrolysis of acid-washed wheat straw

0490683 - ÚFCH JH 2019 RIV NL eng J - Journal Article
Hernando, H. - Fermoso, J. - Ochoa-Hernández, Cristina - Opanasenko, Maksym - Pizarro, P. - Coronado, J. M. - Čejka, Jiří - Serrano, D. P.
Performance of MCM-22 zeolite for the catalytic fast-pyrolysis of acid-washed wheat straw.
Catalysis Today. Roč. 304, SI (2018), s. 30-38. ISSN 0920-5861. E-ISSN 1873-4308
R&D Projects: GA ČR GBP106/12/G015
Grant - others:CASCATBEL(XE) FP7/2007-2013:604307
Institutional support: RVO:61388955
Keywords : bio-oil production * 2-dimensional zeolites * woody biomass * bed reactor * beta * perspectives * cellulose * pathways * biofuels
OECD category: Physical chemistry
Impact factor: 4.888, year: 2018

MCM-22 zeolite samples, having different Si/Al ratios, have been studied for the fast-pyrolysis of acid-washed wheat straw at two catalytic pyrolysis temperatures aimed to the production of partially upgraded bio-oil. The best combination of bio-oil deoxygenation activity and energy yield is obtained when the catalytic bed was operated at 450 degrees C using the MCM-22 sample with the lowest Al content (Si/Al = 40). Interestingly, the increase in the reaction temperature results in a lower amount of coke deposited over the zeolite. On the other hand, reducing the zeolite Si/Al ratio had a negative effect as a higher concentration of acid sites promotes non-desired reactions: severe cracking of the bio-oil vapours, leading to the enhanced production of gaseous hydrocarbons, and coke formation. Coke produced over MCM-22 zeolite exhibits high oxygen content, whereas the bio-oil fraction presents a high concentration of oxygenated aromatics. These results denote the limited aromatization activity of MCM-22 zeolite for producing aromatic hydrocarbons, in particular when compared with ZSM-5, being of interest for the selective production of phenolic compounds by biomass catalytic pyrolysis.
Permanent Link: http://hdl.handle.net/11104/0284828