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Product Distributions of Fischer‐Tropsch Synthesis over Core‐Shell Catalysts: The Effects of Diverse Shell Thickness
Author(s) -
Tian Zhipeng,
Wang Chenguang,
Si Zhan,
Wang Yachen,
Chen Lungang,
Liu Qiying,
Zhang Qi,
Xu Ying,
Ma Longlong
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201801515
Subject(s) - fischer–tropsch process , microporous material , catalysis , product distribution , shell (structure) , chemical engineering , materials science , sintering , adsorption , chemistry , mineralogy , composite material , organic chemistry , selectivity , engineering
A series of core‐shell catalysts with different shell thickness were synthesized and the effect of microporous silica shell on product distribution of Fischer‐Tropsch synthesis was analyzed. Fe 3 O 4 core was prepared by hydrothermal method and the amorphous SiO 2 shell was coated on the Fe 3 O 4 core by sol‐gel method. N 2 adsorption‐desorption analysis indicated an irregular and microporous silica shell and the pore size distribution moved to smaller diameter with the shell thickness increased. In Fischer‐Tropsch synthesis, inactive silica shell increased catalytic activity (FTY) and stability by restricting catalyst cracking and sintering. Product distribution shifted to C 1 ‐C 4 gaseous hydrocarbons with the increasing shell thickness probably due to the diffusion limitations on reactants/products and structure confinement and separation effect of microporous silica shell on restricting the growth of catalytic active particles. Selectivities of C 5+ were restricted within 10% for core‐shell catalysts. WGS reaction activity is reduced as well, which constrains side reaction and amplifies FTS catalytic productivity to hydrocarbons.