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Preparation of mesoporous ZSM-5 catalysts using green templates and their performance in biomass catalytic pyrolysis. 2019

Qingfeng Che, and Minjiao Yang, and Xianhua Wang, and Qing Yang, and Yingquan Chen, and Xu Chen, and Wei Chen, and Junhao Hu, and Kuo Zeng, and Haiping Yang, and Hanping Chen
State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan, Hubei 430074, PR China.

The micropores present in ZSM-5 are beneficial to the production of aromatic compounds in biomass catalytic pyrolysis, although the small pore size leads to severe coke deposition on the catalyst. In this study, a micro-mesoporous structured ZSM-5 zeolite catalyst was synthesized and modified with green templates (sucrose, cellulose, and starch) to introduce additional mesopores. It was found that the catalysts modified using the sucrose and cellulose templates only exhibited a slight increase in their micropore volumes, while the mesopore volume of ZSM-ST (modified with the starch template) reached up to 0.359 cm3/g. This increase promoted the cracking of bulky oxygenates and suppressed the polymerization reaction on the ZSM-5 surface, thereby producing a greater number of aromatic products. Moreover, the benzene, toluene, and xylene (BTX) yields exhibited a positive correlation with the catalyst mesopore volume, with the highest BTX yield of 91.84 mg/g being obtained with 10% starch addition.

UI MeSH Term Description Entries
D002384 Catalysis The facilitation of a chemical reaction by material (catalyst) that is not consumed by the reaction. Catalyses
D000077319 Pyrolysis High temperature decomposition without addition of extra air or oxygen. It yields syngas, bio-oil and bio-char. Pyrolyses
D014050 Toluene A widely used industrial solvent.
D014992 Xylenes A family of isomeric, colorless aromatic hydrocarbon liquids, that contain the general formula C6H4(CH3)2. They are produced by the destructive distillation of coal or by the catalytic reforming of petroleum naphthenic fractions. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 5th ed) Dimethylbenzenes,Xylene
D018533 Biomass Total mass of all the organisms of a given type and/or in a given area. (From Concise Dictionary of Biology, 1990) It includes the yield of vegetative mass produced from any given crop. Biomasses

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