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M.L. Guzmán-Castillo, H. Armendáriz-Herrera, A. Tobón-Cervantes, D.R. Acosta, P. Salas-Castillo, A. [20] [20] Montoya de la Funte, A. Vázquez-Rodriguez, The effect of sulfate ion on the synthesis and stability of mesoporous materials, Stud. Surf. Sci. Catal. 142 (2002) 1039-1046. doi:10.1016/S0167-2991(02)80261-0

has been cited by the following article:

• TITLE: Keggin Structure and Surface Acidity of 12-Phosphotungstic Acid Grafted Zr-MCM-48 Mesoporous Molecular Sieves

  AUTHORS: Zhiqi Wang, Juan Navarrete

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

  JOURNAL NAME: World Journal of Nano Science and Engineering, Vol.2 No.3, September 28, 2012

  ABSTRACT: 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.