The Effect of Preparation Procedure on the Performance of Pd-SiW12/SiO2 Catalysts for the Direct Oxidation of Ethylene to Acetic Acid

Pd-SiW12/SiO2 catalysts were investigated to elucidate the effect of preparation procedure on the direct oxidation of ethylene to acetic acid. Pd-SiW12/SiO2 catalysts with a fixed amount of Pd and SiW12 were prepared in various ways. The order in which Pd and SiW12 were loaded on the SiO2 support and the treatment conditions for the supported Pd have a significant influence on the dispersion of Pd on the Pd-SiW12/SiO2 catalysts, but no influence on the concentration of B acid sites. The Pd-SiW12/SiO2 catalyst prepared by simultaneously loading Pd and SiW12 on the SiO2 support showed the best catalytic activity. The dispersion of Pd was the main factor in the catalytic activity.

摘要： 采用不同负载顺序或制备过程制备了 Pd-SiW12/SiO2 催化剂, 考察了它们在乙烯直接氧化制乙酸反应中的催化性能. 结果表明, Pd 和 SiW12 的负载顺序与 Pd 负载后的处理条件对 Pd-SiW12/SiO2 催化剂上 Pd 的分散度影响较大, 但对催化剂表面 B 酸量影响不大, 而 Pd 分散度较高时, 相应催化剂活性较高. 将 Pd 和 SiW12 同时负载于 SiO2 上时, 催化剂表现出较高的催化乙烯直接氧化制乙酸反应活性.

Graphical abstractPd-SiW12/SiO2 catalysts were investigated to elucidate the effect of preparation procedure on the direct oxidation of ethylene to acetic acid.Figure optionsDownload full-size imageDownload as PowerPoint slide