NDLI: Vapor phase nitration of benzene using mesoporous MoO<sub>3</sub>/SiO<sub>2</sub> solid acid catalyst

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Vapor phase nitration of benzene using mesoporous MoO₃/SiO₂ solid acid catalyst

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Green Chemistry Vol - 8 Issue - 4

Green Chemistry Vol - 8 Issue - 3

Green Chemistry Vol - 8 Issue - 2

Green Chemistry Vol -7

Green Chemistry Vol -6

Green Chemistry Vol -5

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Vapor phase nitration of benzene using mesoporous MoO₃/SiO₂ solid acid catalyst

Content Provider	Royal Society of Chemistry (RSC)
Author	Biradar, A. V. Shelke, S. B. Mathew, S. M. Dongare, M. K. Niphadkar, S. P. Malshe, K. M. Dagde, S. P. Umbarkar, S. B. Patil, P. T.
Copyright Year	2006
Abstract	Nitration of benzene has been carried out in the vapor phase, using dilute nitric acid as the nitrating agent, over mesoporous MoO3/SiO2 solid acid catalyst with more than 90% benzene conversion and 99.9% selectivity for mononitrobenzene. A series of MoO3/SiO2 catalysts with varying MoO3 loadings (1–30 mol%) were prepared using a sol–gel technique and characterized using X-ray diffraction analysis (XRD), BET specific surface area analysis, temperature-programmed desorption (TPD) of ammonia, and FTIR spectroscopic analysis of adsorbed pyridine. XRD analysis revealed the amorphous nature of the catalyst for 1 and 10 mol% MoO3 loading, and the formation of a crystalline α-MoO3 phase on the amorphous silica support at higher MoO3 loading. The BET surface area for pure silica support was 606 m2 g−1 and the pore size distribution in the range 40–80 Å, showing the mesoporous nature of amorphous silica. The BET surface area decreased to 583 m2 g−1 with incorporation of 1% MoO3 and further decreased to 180 m2 g−1 with increasing MoO3 loading up to 20%. Above 10% MoO3 loading, formation of crystalline MoO3 clusters on amorphous silica was observed. Ammonia-TPD showed a drastic increase in acid strength after addition of 1% MoO3 compared to pure silica support and the acid strength increased with increasing MoO3 content. Among the series of catalysts prepared, MoO3/SiO2 containing 20 mol% MoO3 was found to be the most active catalyst for benzene nitration, without showing any deactivation after more than 1000 h, showing a very high potential for commercialization.
Starting Page	488
Ending Page	493
Page Count	6
File Format	HTM / HTML PDF
ISSN	14639262
Volume Number	8
Issue Number	5
Journal	Green Chemistry
DOI	10.1039/b600094k
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Subscribed
Subject Keyword	BET Benzene Acid Nitration Mesoporous material X-ray crystallography Specific surface area Ammonia Pyridine Silicon dioxide
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Pollution

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