Production of hydrocarbon-rich bio-oil by catalytic biomass pyrolysis over metal oxide improved P/HZSM-5 catalyst

被引：0

作者：

Zheng Y. ^{[1
,2
]}

Pei T. ^{[1
,2
]}

Li D. ^{[1
,2
]}

Wang J. ^{[1
,2
]}

Li J. ^{[1
,2
]}

Zheng Z. ^{[1
,3
]}

机构：

[1] National Joint Engineering Research Center for Highly-Efficient Utilization Technology of Forest Biomass Resources, Southwest Forestry University, Yunnan, Kunming

[2] College of Materials Science and Engineering, Southwest Forestry University, Yunnan, Kunming

[3] Xiamen Key Laboratory for High-valued Conversion Technology of Agricultural Biomass (Xiamen University), Fujian Provincial Engineering and Research Center of Clean and High-valued Technologies for Biomass, College of Energy, Xiamen University, Fujian, Xiam

来源：

Huagong Jinzhan/Chemical Industry and Engineering Progress | 2023年 / 42卷 / 03期

关键词：

biomass; catalytic pyrolysis; hydrocarbons; metal modified zeolite; structure-performance relationship;

D O I：

10.16085/j.issn.1000-6613.2022-0865

中图分类号：

学科分类号：

摘要：

The effect of acidity and texture properties of M-P/HZSM-5 zeolite on the catalytic biomass pyrolysis to produce hydrocarbon-rich bio-oil derived was investigated. Metals (Zn, Co, Ce, Cu, Mg, Ga) were incorporated into the P/HZ zeolite that was prepared via wet impregnation and systematic physicochemical characterization techniques, such as XRD, BET, NH3-TPD and FTIR were used to obtain the acidity and textural properties. At the same time, the composition, deoxygenation characteristics and conjugate structure of the upgrading bio-oil were analyzed by GC/MS, UV-fluorescence spectrum and element analyzer. The deactivated catalyst was evaluated by TGA, Raman spectrum and SEM to explore catalytic deactivation mechanism. The results showed that, phosphorus modification significantly reduced the concentration of acid sites, especially the strong ones. This suppressed hydrogen transfer reactions and enhanced the selectivity to olefin, while promoted the stability of the catalyst. The metal loading did not change the framework structure of the catalyst, but formed new metal sites, changed the acid distribution of the catalyst, decreased the specific surface area and pore volume by coverage of the catalyst surface with metal species, and increased the average pore size. The synergistic effect of metal and acid sites significantly promoted the deoxygenation of bio-oil and increased the conversion of monocyclic aromatic hydrocarbons. The deoxygenation degree order was Zn>Mg>Co>Ce >HZSM-5>Ga>P>Cu. The yield of aromatics is positively correlated with the total acid content. High acidity, large average pore size and appropriate specific surface area are conducive to the formation of aromatics. However, low acidity and small pore size promote the conversion of olefin compounds. In addition, the best mass-transfer efficiency and conjugate effect was obtained by using the Zn-P/HZ catalyst, which led to the highest hydrocarbon and monocyclic aromatic hydrocarbons content (86.46% and 78.29%, respectively) among all the investigated metal-modified P/HZ catalysts. Zn promoted the formation of benzene, toluene and alkylbenzene, Mg promoted the conversion of xylene, while Cu and Ga promoted the formation of light olefins. The addition of metal significantly reduced the degree of graphitization and improved the coking resistance. © 2023 Chemical Industry Press. All rights reserved.

引用

页码：1353 / 1364

页数：11

共 43 条

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