Author(s)

Zhiqi Wang, Juan Navarrete

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.

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.

Zr-MCM-48; Surface Acidity; Heteropolyacid; Spectroscopic Characterization

Wang, Z. and Navarrete, J. (2012) Keggin Structure and Surface Acidity of 12-Phosphotungstic Acid Grafted Zr-MCM-48 Mesoporous Molecular Sieves. World Journal of Nano Science and Engineering, 2, 134-141. doi: 10.4236/wjnse.2012.23017.