Highly selective vapor phase nitration of toluene to 4-nitro toluene using modified and unmodified H3PO4/ZSM-5
عنوان مقاله: Highly selective vapor phase nitration of toluene to 4-nitro toluene using modified and unmodified H3PO4/ZSM-5
شناسه ملی مقاله: ZEOLITE01_108
منتشر شده در همایش بین المللی ژئولیت ایران در سال 1387
شناسه ملی مقاله: ZEOLITE01_108
منتشر شده در همایش بین المللی ژئولیت ایران در سال 1387
مشخصات نویسندگان مقاله:
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
خلاصه مقاله:
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
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.
کلمات کلیدی: Vapor phase; Nitration; Cationic surfactant; H3PO4; Modified ZSM-5; Toluene; 4-nitrotoluene
صفحه اختصاصی مقاله و دریافت فایل کامل: https://civilica.com/doc/66158/