Studying the Catalytic Activity of Naturally Occurring Zeolites in the Gas-Phase Nitration Reaction of Aromatic Compounds
A. P. KOSKIN1, K. S. GOLOKHVAST2, I. G. DANILOVA1, A. A. VEDYAGIN1,3 and I. V. MISHAKOV1,3
1 Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences,
Pr. Akademika Lavrentyeva 5, Novosibirsk 630090 (Russia)
E-mail: koskin@catalysis.ru
2 Far East Federal University,
Ul. Sukhanova 8, Vladivostok 690950 (Russia)
3 3Novosibirsk State Technical University,
Ul. K. Marksa 20, Novosibirsk 630092 (Russia)
Keywords: naturally occurring zeolites, acidic properties, gas-phase nitration of benzene, toluene, nitrobenzene, nitrotoluene
Pages: 313–321
Abstract
An alternative gas phase nitration process was investigated wherein the reaction between an aromatic substrate (benzene/toluene) and a nitrating agent (either a 68 mass % HNO3 aqueous solution, or a mixture of nitrous gases) occurs on a fixed-bed solid acidic catalyst. There have been studied physicochemical properties (elemental composition, pH, crystallinity) and catalytic properties inherent in the samples of naturally occurring zeolites taken from the deposits of Siberia and the Far East. An effect of zeolite preliminary treatment (calcination and acid extraction method) exerted on the activity thereof was investigated. It has been demonstrated that the highest activity is exhibited by a sample with the highest concentration of Bronsted acid sites (99 µmol/g according to NH3 adsorption), taken from the Kulikovo deposit (the Amur Region). The productivity of the sample amounted to 161 mg/(gcat · h).
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