12-Tungstophosphoric acid supported on MCM-41 for esterification of fatty acid under solvent-free condition
- 作者：Joon Ching Juan ; Jingchang Zhang ; Mohd Ambar Yarmo
- 关键词：12-Tungstophosphoric acid ; MCM-41 ; Solid acid catalyst ; Esterification
- 刊名：Journal of Molecular Catalysis A ; Chemical
- 出版年：2007
- 期刊代码：57_13811169
- 类别：ch
- 出版时间：18 April 2007
- 卷：267
- 期：1-2
- 页码：265-271
- 文件大小：677 K
摘要
The potential of supported 12-tungstophosphoric acid (HPW) is of great importance as acid catalyst. Therefore, a series solid acid catalysts, comprised of 10–50 wt.%HPW supported on MCM-41 were synthesized and characterized using XRD, FT-IR, BET and TEM. The catalytic activities of these catalysts were tested for esterification of lauric acid with butanol using Dean-Strak apparatus, under solvent-free conditions. The host material suffers severe structural distortions at higher loading, which lead to a considerable loss of long-range orders. Based on these experimental findings, the optimal conversion of lauric acid with loading of 30 wt.%HPW was found to be higher than other loading and bulk HPW. The reaction was also studied over commercially available liquid acid, such as sulfuric acid and p-toluene sulfonic acid. It is assumed that the reaction mainly occurs inside the mesopores of the partially distorted MCM-41 because HPW loaded on an as-synthesized catalyst shows lower conversion than that of calcined material.