Molecular shape selectivity of HZSM-5 in catalytic conversion of biomass pyrolysis vapors: The effective pore size

被引:77
作者
Hu, Changsong [1 ]
Zhang, Huiyan [1 ]
Wu, Shiliang [1 ]
Xiao, Rui [1 ]
机构
[1] Southeast Univ, Sch Energy & Environm, Key Lab Energy Thermal Convers & Control, Minist Educ, Nanjing 210096, Peoples R China
基金
中国国家自然科学基金; 美国国家科学基金会;
关键词
Biomass; HZSM-5; Pyrolysis; Pore size; Critical diameter; Shape selectivity; ZEOLITE CATALYSTS; BIO-OILS; ZSM-5; 2-METHYLNAPHTHALENE; METHYLATION; METHANOL; LIGNIN;
D O I
10.1016/j.enconman.2020.112678
中图分类号
O414.1 [热力学];
学科分类号
摘要
This article is intended to deepen the understanding of molecular shape selectivity of HZSM-5 in catalytic conversion of biomass pyrolysis vapors through the study of catalyst effective pore size. Ex-situ catalytic fast pyrolysis (CFP) of biomass over HZSM-5 with varied catalyst loadings were carried out using a continuous feeding two-stage fluidized-bed/fixed-bed combination reactor. Results showed that in addition to the shape selective reactions inside catalyst channels, cracking and aggregating reactions occur at the external surface of HZSM-5. The catalytic activity of HZSM-5 external surface for some heavy compounds was observed to be relatively low. On the basis of the molecular dimension information provided by quantum chemical calculations, it was found that HZSM-5 has an effective pore size which is significantly larger than its static pore size at CFP temperature. Catalytic alkylation of naphthalene with methanol over HZSM-5, HZSM-5@silicalite-1, HSAPO-34, HM, H beta, HUSY and HMCM-41 were further compared to determine the effective pore size of HZSM-5. It is proposed that the effective pore size of HZSM-5 at CFP temperature is between the critical molecular diameters of 2,3- and 1,6-dimethylnaphthalene (between 7.520 and 7.961 angstrom).
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页数:10
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