Fischer-Tropsch synthesis over methyl modified Fe^sub 2^O^sub 3^@SiO^sub 2^ catalysts with low CO^sub 2^ selectivity

Methyl modified Fe2O3@SiO2 catalysts with core-shell structure were fabricated through hydrothermal method, Stöber method, and following silylation reaction procedure, where the SiO2 shell was employed as a bridge contacting Fe core and hydrophobic groups of CH3 to obtain a highly hydrophobic surfac...

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Published inApplied catalysis. B, Environmental Vol. 232; p. 420
Main Authors Yu, Xufei, Zhang, Jianli, Wang, Xu, Ma, Qingxiang, Gao, Xinhua, Xia, Hongqiang, Lai, Xiaoyong, Fan, Subing, Zhao, Tian-Sheng
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier BV 15.09.2018
Subjects
Carbon dioxide
Catalysis
Catalysts
Chemical synthesis
Contact angle
Core-shell structure
Fischer-Tropsch process
Fourier transforms
Hematite
Hydrocarbons
Hydrophobicity
Infrared spectroscopy
Iron compounds
Iron oxides
Mossbauer spectroscopy
Selectivity
Silicon dioxide
Water gas
X ray photoelectron spectroscopy
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Summary:Methyl modified Fe2O3@SiO2 catalysts with core-shell structure were fabricated through hydrothermal method, Stöber method, and following silylation reaction procedure, where the SiO2 shell was employed as a bridge contacting Fe core and hydrophobic groups of CH3 to obtain a highly hydrophobic surface of Fe catalyst. The synthesized catalysts showed high activity and stability toward CO hydrogenation with very low CO2 selectivity (below 5% based on carbon) in a fixed-bed reactor. The catalyst samples were characterized by TEM, SEM, FT-IR, TG, XRD, Mössbauer spectroscopy, N2 adsorption-desorption, H2-TPR, in situ CO-TPD, XPS, and water contact angle measurements. The results manifest that the hydrophobic surface by methyl modification can prevent the readsoption of water, that inhibits distinctly the water gas shift (WGS) activity and thus suppresses the production of CO2. Furthermore, methyl modified Fe2O3@SiO2 catalyst exhibits higher selectivity of C2=-C4= hydrocarbons than Fe2O3@SiO2 catalyst.
ISSN:0926-3373
1873-3883