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Regulating light olefins or aromatics production in ex-situ catalytic pyrolysis of biomass by engineering the structure of tin modified ZSM-5 catalyst. 2021

Jingyuan Shang, and Guangbin Fu, and Zhenping Cai, and Xiang Feng, and Yongxiao Tuo, and Xin Zhou, and Hao Yan, and Chong Peng, and Xin Jin, and Yibin Liu, and Xiaobo Chen, and Chaohe Yang, and De Chen
State Key Lab of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, China.

Valorization of biomass to olefin or aromatics harbours tremendous practical value due to growing concerns about sustainable production of chemicals. Herein, the olefin or aromatics yields of ex-situ catalytic pyrolysis of pine can be regulated by impregnating Sn on hollow-structured ZSM-5 (M-ZSM-5) and microporous ZSM-5 catalysts in fixed-bed reactor, respectively. Results showed that Sn/ZSM-5 catalyst simultaneously increased medium acidic sites and maintained strong acidic sites, which obtained the maximum carbon yield of aromatics (33.77%) due to enhanced cracking and deoxygenation reactions. In addition, Sn boosted alkylation between olefin and aromatics, generating more alkylbenzene. In contrast, Sn/M-ZSM-5 catalyst produced the highest olefins carbon yield (12.39%) because the reduction of strong acidic sites and microporous volume inhibited the olefin aromatization. Moreover, olefins were easier to desorb from Sn/M-ZSM-5 due to the enhanced mass transfer ability, which weakened the alkylation reactions. The synergistic effect harbours great significance to manipulate the distribution of products.

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
D000475 Alkenes Unsaturated hydrocarbons of the type Cn-H2n, indicated by the suffix -ene. (Grant & Hackh's Chemical Dictionary, 5th ed, p408) Alkene,Olefin,Olefins,Pentene,Pentenes
D014001 Tin A trace element that is required in bone formation. It has the atomic symbol Sn, atomic number 50, and atomic weight 118.71. Stannum
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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