Effect of Mn on Co/HMS-Mn and Co/SiO2-Mn catalysts for the Fischer-Tropsch reaction

SALAZAR-CONTRERAS, HÉCTOR G.; FUENTES, GUSTAVO A.; MARTÍNEZ-HERNÁNDEZ, ANGEL; TORRES-GARCÍA, ENELIO; BOIX, ALICIA A.

APPLIED CATALYSIS B-ENVIRONMENTAL

ELSEVIER SCIENCE BV

Año: 2019 vol. 244 p. 414 - 426

0926-3373

The structural changes of cobalt deposited on SiO2 and Hexagonal Mesoporous Silica (HMS) supports were studied when Mn was used as a promoter and added to the catalyst during the synthesis of the supports by the sol-gel method. This synthetic method was used to promote the contact between the highly dispersed Mn in the supports and the Co added by incipient impregnation. The characterization results reveal that the presence of Mn promoted the dispersion of deposited cobalt oxide particles, causing a ?wetting-like? effect of the cobalt oxide on the support surface, which led to a decrease of the average particle size of cobalt oxide from 13 to 10 nm in absence and presence of Mn respectively. The characterization results indicate that the Co2+ species react with Mn ions to form a likely Mn-Co spinel. Additionally, it was found that the promotion effects of Mn on the catalytic activity at atmospheric pressure for the Fischer-Tropsch synthetic reaction on both studied supports were significantly different because of the low metal loading used (