Journal
CATALYSIS TODAY
Volume 164, Issue 1, Pages 358-363Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cattod.2010.10.049
Keywords
Solid acid; Porous metal oxide; Friedel Crafts alkylation; FT-IR
Funding
- Grants-in-Aid for Scientific Research [19106015] Funding Source: KAKEN
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Several porous Nb(x)Mo(10-x) mixed oxides prepared from NbCl(5) and MoCl(5) in the presence of block copolymer surfactant Pluronic P-123 were examined as potential solid acid catalysts. Amorphous mesoporous structures were observed in samples with x from 10 to 9, whereas samples with higher Mo concentrations (x = 3-8) formed large pores by inter-particle voids and a non-porous structures with crystallized molybdenum oxide (MoO(3)) were observed in samples with x from 0 to 2. The acid strength increased with increasing the Mo content in Nb(x)Mo(10-x) oxides, which was determined by NH(3) temperature-programmed desorption (NH(3)-TPD) and Fourier transform infrared (FT-IR) spectroscopy using pyridine as a probe molecule. Porous Nb(3)Mo(7) oxide exhibited the highest acid-catalytic activity for the Friedel-Crafts alkylation of anisole due not only to mole ratio of Nb/Mo but also to pore structure. (C) 2010 Elsevier B. V. All rights reserved.
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