Effect of plating conditions for electroless Ni deposition on catalytic properties of K_2MoO_4/Ni-SiO_2 catalyst

摘要

A series of K_2MoO_4/Ni-SiO_2 catalysts with Ni-SiO_2 as support for methanethiol synthesis from H_2S-rich synthesis gas were prepared and characterized by BET, ESR, XPS and HRTEM techniques. The optimum electroless plating condition was explored for the preparation of Ni-SiO_2 support. Physicochemical char acterization results show that the Ni-SiO_2 support prepared under the alkaline condition and relatively high plating temperature makes molybdenum species dispersing more uniformly, leading to an appro priate K/Mo atomic ratio on its surface owing to the advantage of surface morphology. The sulfurized catalyst was found to have a suitable pore diameter distribution and a suitable molar ratio of S~(2-)_2/S~(2-) (close to 1) on the surface of the catalyst, which were confirmed to be in favor of the improvement of the catalytic performance of the catalyst.