B-doped activated carbon as a support for a high-performance Zn-based catalyst in acetylene acetoxylation

摘要

A series of boron-doped(B-doped) catalysts with dissimilar mass ratios of boric acid and activated carbon(AC) were prepared by an impregnation method for acetylene acetoxylation.The introduction of a number of boron atoms activates the stable π electrons in AC,which not only enhances the electron transfer between Zn and the reactants,but also improves the adsorption ability of CH_(3)COOH.Improving the conversion rate of CH_(3)COOH from 50% to 65% effectively.The inductively coupled plasma(ICP) analysis confirmed the content of zinc approximately 7.3 wt% for both Zn/AC and Zn/0.02 B-AC-900 catalysts.Furthermore,X-ray photoelectron spectroscopy(XPS) analysis demonstrated that the introduction of boron changed the electron cloud density of Zn,and the strength of the Zn–O(from CH_(3)COOH) bond was increased.In addition,temperature-programmed desorption(TPD) analysis revealed that the Zn/0.02 B-AC-900 catalyst enhanced the adsorption of CH_(3)COOH and reduced the adsorption of C_(2)H_(2),thus the conversion rate of CH_(3)COOH was increased.