Design of a highly active silver-exchanged phosphotungstic acid catalyst for glycerol esterification with acetic acid
作者:Shanhui Zhu、Xiaoqing Gao、Fang Dong、Yulei Zhu、Hongyan Zheng、Yongwang Li
DOI:10.1016/j.jcat.2013.06.026
日期:2013.10
A series of highly active, selective, and stable silver-exchanged phosphotungstic acid (AgPW) catalysts were prepared, characterized, and evaluated for bio-derived glycerol esterification with acetic acid to produce valuable biofuel additives. The structures, morphologies, acidities, and water tolerance of these samples were determined by FTIR, Raman, XRD, SEM-EDX, FT-IR of pyridine adsorption, and
制备,表征和评估了一系列高活性,选择性和稳定的银交换磷钨酸(AgPW)催化剂,以评估乙酸对生物衍生甘油的酯化反应,从而制得有价值的生物燃料添加剂。通过FTIR,拉曼,XRD,SEM-EDX,吡啶吸附的FT-IR和H 2 O-TPD确定这些样品的结构,形态,酸度和耐水性。还进行了几种典型的酸性催化剂的比较。其中,部分是银交换的磷钨酸(Ag 1PW)具有独特的高活性,由于独特的Keggin结构,高酸度和出色的耐水性,在短短15分钟的反应时间内即可实现96.8%的转化率和出色的稳定性。还提出了合理的反应机理。此外,这种Ag 1 PW催化剂对酯化反应具有普遍意义,在其他广泛的酸催化反应中也具有巨大潜力。