负载型WO3/SiO2-Al2O3催化剂用于合成乙酸乙酯反应研究

Catalytic performance of supported WO3/SiO2-Al2O3 for esterification of acetic acid with ethanol

摘要:

考察了SiO2、γ-Al2O3和SiO2-Al2O3载体负载氧化钨作为催化剂用于乙酸乙酯合成反应研究，并且通过XRD、氮气物理吸附、Raman和NH3-TPD等方法对催化剂进行表征。结果表明：氧化钨负载在SiO2-Al2O3载体上，具有更强的酸性和更高的酸量，有利于促进乙酸乙酯合成反应进行。当W在SiO2-Al2O3载体表面的负载量为8 %（质量分数）时，乙酸转化率最高可以达到69.7 %，载体表面WO3晶体颗粒不利于提高酯化反应活性。

Abstract:

A series of catalysts made of tungsten oxide loaded on SiO2, γ-Al2O3, and SiO2-Al2O3 were tested for esterification of acetic acid with ethanol. The catalysts were studied by characterization of XRD, nitrogen adsorption measurement, Raman and NH3-TPD in detail. The results indicated that tungsten oxide supported on SiO2-Al2O3 lead to the stronger and more acid sites, which appeared to be more effective for esterification of acetic acid with ethanol. Among these catalysts, SiO2-Al2O3 supported 8.0 wt% tungsten catalyst gave the highest activity for esterification of acetic acid with ethanol reaction with the conversion of acetic acid up to 69.7 %. Bulky crystalline WO3 loaded on SiO2-Al2O3 was disadvantage for improving activity of esterification.