Core-Shell-Structured Co-Z@TiO2 Catalysts Derived from ZIF-67 for Efficient Production of C5+ Hydrocarbons in Fischer-Tropsch Synthesis

Hu Wang, Bingxia Wu, Yuan Cai, Chengwei Zhou, Nengjie Feng, Geng Liu, Chong Chen, Hui Wan, Lei Wang, Guofeng Guan

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

The core-shell-structured Co-Z@TiO2(N2+O2) catalyst, which was prepared by subsequent pyrolysis and calcination from precursor ZIF-67 coated by amorphous TiO2, was applied in Fischer-Tropsch synthesis (FTS). Compared with Co-Z@TiO2 catalyst, which was directly calcinated in air (Co-Z@TiO2(O2)) or pyrolyzed in N2 (Co-Z@TiO2(N2)), the Co-Z@TiO2(N2+O2) catalyst showed better dispersion, easier reducibility, and optimal metal cobalt particle size (8.4 nm) due to the intermediate pyrolysis treatment and core-shell structure. The Co-Z@TiO2(N2+O2) catalyst exhibited high cobalt time yield (14.84 μmolCO·gCo-1·s-1), high selectivity to C5+ (81.5%), and low selectivity to low carbon hydrocarbon (CH4 (12.7%) and C2-C4 (5.8%)). The core-shell structure could enhance diffusion limitations to transform intermediate products into heavier hydrocarbons. After 110 h of evaluation, the Co-Z@TiO2(N2+O2) catalyst still maintained good catalytic performance and cobalt particle size distribution.

Original languageEnglish
Pages (from-to)7900-7908
Number of pages9
JournalIndustrial and Engineering Chemistry Research
Volume58
Issue number19
DOIs
StatePublished - 15 May 2019

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