Influence of porous characteristics of the carbon support on alkali-modified trimetallic Co-Rh-Mo sulfided catalysts for higher alcohols synthesis from synthesis gas

摘要

Alkali-modified trimetallic Co-Rh-Mo sulfided catalysts supported on commercial activated carbons with different textural characteristics were tested for the synthesis of higher alcohols from synthesis gas and compared with a similar catalyst supported on multi-walled carbon nanotubes (MWCNTs). Addition of metals (Co, Rh, and Mo) to the microporous and mesoporous activated carbons, and the MWCNT supports increased the mean pore diameter and % mesoporosity of the catalysts. The N2 adsorption-desorption isotherms of the MWCNTs support and the MWCNT-supported alkali-modified trimetallic C-Rh-Mo catalyst revealed that the mesoporous structural integrity of the catalyst was unchanged from the support after impregnation of the catalyst species. The formation of large particles took place due to the agglomeration of metal species on the microporous activated carbon supports. The metal dispersion of the sulfided catalysts on different supports is: MWCNTs