Preparation of SiO2 immobilized Co-based catalysts from ZIF-67 and the enhancement effect for Fischer-Tropsch synthesis

被引:39
作者
Chen, Yao [1 ]
Li, Xin [1 ]
Zhang, Jingwei [1 ]
Zhao, Ning [1 ]
Dai, Liya [1 ]
Jiang, Xiangning [1 ]
Liu, Chengchao [2 ,3 ]
Lyu, Shuai [2 ,3 ]
Li, Zhenhua [1 ]
机构
[1] Tianjin Univ, Collaborat Innovat Ctr Chem Sci & Engn Tianjin, Sch Chem Engn & Technol, Key Lab Green Chem Technol,Minist Educ, Tianjin 300072, Peoples R China
[2] South Cent Univ Nationalities, Coll Chem & Mat Sci, State Ethn Affairs Commiss, Key Lab Catalysis & Mat Sci, Wuhan 430074, Peoples R China
[3] South Cent Univ Nationalities, Coll Chem & Mat Sci, Minist Educ, Wuhan 430074, Peoples R China
基金
中国国家自然科学基金;
关键词
Fischer-Tropsch synthesis; ZIF-67; Embedded SiO2; Cobalt time yield; Immobilization effect; SELECTIVE CONVERSION; COBALT CATALYSTS; RUTHENIUM NANOPARTICLES; HIGHER ALCOHOLS; EFFICIENT; SYNGAS; OLEFINS; HYDROGENATION; HYDROCARBONS; PRECURSOR;
D O I
10.1016/j.apcatb.2021.120027
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
ZIF-67-derived Co@C catalysts show great potential for Fischer-Tropsch synthesis (FTS) due to high cobalt (Co) loading and proper cobalt crystalline size, while improving the FTS activity and stability is still a major challenge. In this work, SiO2 was embedded to immobilize Co particles by introducing a silicon source into ZIF-67 using ex-situ or in-situ methods to prevent cobalt particles from aggregating. Due to exposure of more active cobalt sites and elimination of microcrystalline Co on the ex-situ soaking catalysts, increased FTS activity and decreased CH4 selectivity were achieved, but undesirable stability was observed due to the weak immobilization ability of SiO2. To enhance the immobilization effect of SiO2, E-ZIF-67@nSiO(2) precursors were prepared by an in-situ soaking method in which the formation of ZIF-67 and introduction of SiO2 occurred simultaneously. The obtained E-Co3O4@4SiO(2) catalyst exhibits not only much high FTS activity but also good stability.
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页数:12
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