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Catalytic fast pyrolysis of maize straw with a core–shell ZSM-5@SBA-15 catalyst for producing phenols and hydrocarbons

Xue, Xiangfei, Liu, Yawen, Wu, Liu, Pan, Xuze, Liang, Jie, Sun, Yifei
Bioresource technology 2019 v.289 pp. 121691
biofuels, biomass, catalysts, catalytic activity, composite polymers, corn straw, crystallization, hydrocarbons, phenols, porous media, pyrolysis, silica, sorption, transmission electron microscopy, zeolites
Zeolites have been widely used as catalysts in the catalytic pyrolysis of biomass to produce biofuels and/or bio-based chemicals, which could lead to the replacement of fossil sources by renewable ones. However, conventional zeolites often suffer from diffusion resistance for large intermediate oxygenates. To solve this problem, a micro/mesoporous core–shell composite zeolite ZSM-5@SBA-15 was prepared and employed as a catalyst in the catalytic pyrolysis of maize straw. ZSM-5@SBA-15 was synthesized by crystallizing mesoporous silica on the external surface of ZSM-5 using the triblock copolymer Plunoric P123 as the template. The core–shell and hierarchical structures were verified using PXRD, TEM, and N2 sorption experiments. In the catalytic pyrolysis of maize straw, ZSM-5@SBA-15 significantly enhanced the yield of valuable phenols and hydrocarbons in bio-oil, compared to ZSM-5 and SBA-15. The results demonstrated the potential application of micro@mesoporous core–shell composite zeolites in the catalytic pyrolysis of biomass.