Keggin Structure and Surface Acidity of 12-Phosphotungstic Acid Grafted Zr-MCM-48 Mesoporous Molecular Sieves
Keggin Structure and Surface Acidity of 12-Phosphotungstic Acid Grafted Zr-MCM-48 Mesoporous Molecular Sieves作者机构：Dirección de Investigación y Posgrado Instituto Mexicano del Petróleo Eje Lázaro Cárdenas Norte No. 152 México D.F. Mexico The American School Foundation Bondojito No. 21 Col. Las Americas México D.F. Mexico
出 版 物：《World Journal of Nano Science and Engineering》 (纳米科学与工程（英文）)
年 卷 期：2012年第2卷第3期
页 面：134-141页
主 题：Zr-MCM-48 Surface Acidity Heteropolyacid Spectroscopic Characterization
摘 要：A zirconium modified MCM-48 mesoporous material was synthesized by surfactant-templated method. Surface grafting Zr-MCM-48 with tungstophosphoric acid led to a great enhancement of both the number of the Br?nsted acid sites and acidity strength in comparison with the bare support. At 100°C, the 30 wt% H3PW12O40/Zr-MCM-48 contained 174 μmol/g Br?nsted acid sites which were 14.5 times greater than that of Zr-MCM-48. The Keggin structure of the grafted heteropolyacid was rather stable after calcination at 400°C for 2 h, approximately 93.3% of Keggin structure in the dispersed heteropolyacid were remained without destruction but slightly distorted in some degree, as evidenced by FTIR characterization and 31P NMR-MAS analysis. This H3PW12O40/Zr-MCM-48 solid with three dimensional mesoporous system, large surface area and very strong Br?nsted acidity will be a promising catalyst for acid catalytic reactions.
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