Highly selective vapor phase nitration of toluene to 4-nitro toluene using modified and unmodified H3PO4/ZSM-5
Publish place: Iran International Zeolite Conference
Publish Year: 1387
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:
ZEOLITE01_108
تاریخ نمایه سازی: 30 دی 1387
Abstract:
The nitration of toluene has been studied in the vapor-phase at various temperature over a series of
surface modified and unmodified ZSM-5 (Si/Al = 60-170) loaded with H3PO4, differing in the external
surface treatment of the zeolites. All samples were characterized by element chemical analysis, X-ray
diffraction, N2 physisorption, thermal analyses and FT-IR.. When the external surface of the zeolite is
blocked with a surfactant before loading it with H3PO4, the selectivity to form the 4-nitrotoluene was higher.
This superior performance of the externally blocked catalysts, relative to the unmodified H3PO4/ZSM-5
catalyst, shows that by blocking the external surface area of the ZSM-5 support, it exhibits a superior
catalytic selectivity than the unmodified catalyst. Catalysts containing 0–4.9 wt.% P were prepared using
modified and unmodified ZSM-5 zeolites, and their catalytic performance for vapor phase nitration of
toluene to 4-nitrotoluene (4-NT), 2-nitrotoluene (2-NT) and oxidation products was determined. The effect
of reaction temperature, H3PO4 content, feed ratio of HNO3 to toluene, WHSV and carrier gas flow rate was
also investigated.
Keywords:
Authors
Roozbeh J. Kalbasi
Department of Chemistry, Islamic Azad University, Shahreza Branch, Isfahan, Iran
ahmadreza massah
Department of Chemistry, Islamic Azad University, Shahreza Branch, Isfahan, Iran
mehran ghiaci
Department of Chemistry, Isfahan University of Technology, Isfahan, Iran
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