96 / 2019-11-02 16:43:34

SHAPE-CONTROLLED SYNTHESIS OF COBALT-BASED CATALYSTS WITH ENHANCED CATALYTIC ACTIVITY FOR HIGHER ALCOHOL SYNTHESIS FROM SYNGAS

Higher alcohol synthesis，Fischer–Tropsch synthesis，catalyst

Higher alcohol synthesis (HAS) by catalytic hydrogenation of CO via the Fischer–Tropsch synthesis (FTS) is one of the important way to clean utilization of coal resources. However, the structure-performance relationship of those catalysts for HAS is still a challenge for both academia and industry. It widely accepts that FTS is a surface-catalyzed and structure-sensitive reaction. Its catalytic performance is strongly influenced by the nano-effects of the catalyst, such as the effects of active phase, particle size and exposed facets of the active components. Thus, shape-dependent catalytic behavior of catalysts is attracting increasing research interest. Herein, K promoted cobalt catalysts (K-Co@NC) with various morphologies were synthesized by adding K salt to N-doped Co-carbon composites derived from pyrolysis of ZIF-67. The effects of the catalyst particle shape (pie, cube, and dodecahedron), on the performance of K-Co@NC catalysts for HAS were investigated. The results indicated that the cooperative effect between Co0 and Co-Nx dual site was responsible for the activity of the cube catalyst with high yield of higher alcohols (C2+OH) (86%).