Toluene and chlorobenzene dinitration over solid H3PO4/MoO3/SiO2 catalyst

Joanna Adamiak , Dorota Kalinowska-Alichnewicz , Michał Szadkowski , Wincenty Skupiński

Abstract

A new catalyst, H3PO4/MoO3/SiO2, was prepared by modification of MoO3/SiO2 using phosphoric acid. The characterization of the catalyst was performed using Infrared and Raman Spectroscopy, potentiometric titration and nitrogen adsorption–desorption methods. Molybdenum oxides were identified along with phosphomolybdic acid and polymolybdates on the modified surface. The suitability of the catalysts for toluene and chlorobenzene nitration in continuous process was examined. Toluene is effectively nitrated to dinitrotoluene (DNT) in one-stage process (96 wt.\% of DNT in the product) and in mild conditions i.e. at room temperature and only with ten-fold excess of nitric acid. In chlorobenzene nitration only twelve-fold excess of nitric acid is needed to obtain as high yield as 95 wt.\%. Most importantly, the novel catalysts we have developed, provide the opportunity for sulfuric acid- free nitration of aromatic compounds.
Author Joanna Adamiak (FC)
Joanna Adamiak,,
- Faculty of Chemistry
, Dorota Kalinowska-Alichnewicz
Dorota Kalinowska-Alichnewicz,,
-
, Michał Szadkowski
Michał Szadkowski,,
-
, Wincenty Skupiński (FC / DH-EM)
Wincenty Skupiński,,
- Department Of High-Energetic Materials
Journal seriesJournal of Hazardous Materials, ISSN 0304-3894
Issue year2011
Vol195
No0
Pages195-200
Keywords in EnglishContinuous process, Dinitrochlorobenzene, Dinitrotoluene, Nitration, Solid catalyst
DOIDOI:10.1016/j.jhazmat.2011.08.031
URL http://www.sciencedirect.com/science/article/pii/S0304389411010363
Languageen angielski
Score (nominal)45
Publication indicators WoS Impact Factor: 2011 = 4.173 (2) - 2011=4.553 (5)
Citation count*5 (2016-09-11)
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