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Number of results

Journal

2009 | 7 | 4 | 780-786

Article title

Effects of doping with CeO2 and calcination temperature on physicochemical properties of the NiO/Al2O3 system

Content

Title variants

Languages of publication

EN

Abstracts

EN
The effects of doping with CeO2 and calcination temperature on the physicochemical properties of the NiO/Al2O3 system have been investigated using DTA, XRD, nitrogen adsorption measurements at −196°C and decomposition of H2O2 at 30–50°C. The pure and variously doped solids were subjected to heat treatment at 300, 400, 700, 900 and 1000°C. The results revealed that the specific surface areas increased with increasing calcination temperature from 300 to 400°C and with doping of the system with CeO2. The pure and variously doped solids calcined at 300 and 400°C consisted of poorly crystalline NiO dispersed on γ-Al2O3. Heating at 700°C resulted in formation of well crystalline NiO and γ-Al2O3 phases beside CeO2 for the doped solids. Crystalline NiAl2O4 phase was formed starting from 900°C. The degree of crystallinity of NiAl2O4 increased with increasing the calcination temperature from 900 to 1000°C. An opposite effect was observed upon doping with CeO2. The NiO/Al2O3 system calcined at 300 and 400°C has catalytic activity higher than individual NiO obtained at the same calcination temperatures. The catalytic activity of NiO/Al2O3 system increased, progressively, with increasing the amount of CeO2 dopant and decreased with increasing the calcination temperature.

Publisher

Journal

Year

Volume

7

Issue

4

Pages

780-786

Physical description

Dates

published
1 - 12 - 2009
online
6 - 10 - 2009

Contributors

  • Chemistry Department, Community Collage, Baha University, Baha, KSA, Egypt
author
  • Physical Chemistry Department, Catalysis and Surface Laboratory, National Research Center, Dokki, Cairo, Egypt

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Document Type

Publication order reference

Identifiers

YADDA identifier

bwmeta1.element.-psjd-doi-10_2478_s11532-009-0062-7
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