Effects of Ag promotion for Co/Al2O3 catalyst in Fischer-Tropsch synthesis

• Published in: Catalysis today 2020-02, Vol.342, p.111-114
• Main Authors: Xu, Run, Hou, Chaopeng, Xia, Guofu, Sun, Xia, Li, Mingfeng, Nie, Hong, Li, Dadong
• Format: Article
• Language: English
• Subjects: CO conversion; Cobalt catalyst; Fischer-Tropsch synthesis; Silver promotion
• ISSN: 0920-5861; 1873-4308
• DOI: 10.1016/j.cattod.2019.04.004

[Display omitted] •The presence of relatively small quantities of Ag additive can help to enhance the performance of Co/Al2O3 catalysts in Fischer-Tropsch synthesis.•Ag promoter can improve the dispersion of the cobalt species and hence the number of active sites.•Ag can promote the reduction of CoO species due to the change of support interaction with the cobalt oxide crystallites. Ag promoted Co/Al2O3 Fischer-Tropsch synthesis catalysts were preparation by wetness impregnation and characterized by nitrogen physisorption, X-ray diffraction, temperature programmed technologies and H2 chemisorption. Their performances of Fischer-Tropsch synthesis were evaluated in a fixed bed reactor. The result indicated that Ag promoter can improve the dispersion of the cobalt species and facilitate the reduction of CoO to metallic Co. Ag significantly increases the CO conversion rate and C5+ selectivity of Fischer-Tropsch reaction, while decreases the production of methane. However, negative effects were found at higher level Ag loading. As a result, the presence of relatively small quantities of Ag additive can help to enhance the performance of Co/Al2O3 catalysts in Fischer-Tropsch synthesis.