Preparation and characterization of nanocatalysts containing HPW
محل انتشار: اولین کنفرانس ملی نانو از سنتز تا صنعت
سال انتشار: 1396
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 397
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شناسه ملی سند علمی:
NFSI01_207
تاریخ نمایه سازی: 17 آبان 1396
چکیده مقاله:
Heteropoly acids (HPAs) containing Cs have had rapid growth in the last decade as solid acid catalysts. They can offer several advantages in terms of catalytic performance as well as strong acid and redox sites. Among various types of heteropolyacid structures, Keggin-type structure has significantly high acidity and thermal stability. In particular, the Cs-exchanged Keggin-type heteropolyacid is well maintained at high temperatures, usually over 500°C. Conventionally, a suitable transition metal (M = Pt, Pd, Ni, Mo and Co) has been applied as the main active metal component, which is deposited on the acidic supports. For example, it is of great interest to develop new hydrocracking catalysts composed of H3PW12O40, as acid sites and M as the metal sites.In this research, Ni-Mo-Cs/HPW/Al2O3 nanocatalysts were prepared by impregnation method. First, alumina support (specific surface area 273 m2g-1, 35–70 mesh) was impregnated with a solution containing the desired quantities of Ni(NO3)2 (98%, BDH), (NH4)6Mo7O24.4H2O (99.9%, Merck) and Cs2CO3 (99.9% Merck) and then the samples were impregnated with a solution containing the desired quantity of H3PW12O40 (99.9%, Merck). The synthesized samples were characterized by X-ray diffraction (XRD) and energy dispersive X-ray spectroscopy (EDX). Morphology of the samples was studied by scanning electron microscope (SEM) and the surface area, pore volume and pore size of the catalysts were determined by BET method. The obtained results indicate that the size of prepared samples are in nano-scale range, in addition, the synthesized samples have spherical shape. The surface area of the sample that contain Mo and Ni is more than that of contain only Ni or Mo.
کلیدواژه ها:
Nanocatalys; Hetropolyacid; Nickel; Molybden; Cesium
نویسندگان
h Amirmoghadam
Department of Chemistry, Science and Research Branch, Islamic Azad University, Tehran,Iran
m Hosseini Sadr
Department of Chemistry, Tarbiat Moallem University of Azarbaijan, Tabriz, Iran
h.r Aghabozorg
Research Institute of Petroleum Industry, Tehran, Iran
f Salehirad
Research Institute of Petroleum Industry, Tehran, Iran