Advances in Natural Sciences, T. 7, S. 1 (2006)

Cỡ chữ:  Nhỏ  Vừa  Lớn

A Study on Methanation of Carbon Monoxide over Catalysts NiO/TiO2 and NiO/-Al2O3

Luu Cam Loc, Nguyen Manh Tuan, Nguyen Kim Dung, Nguye Huu Huy Phuc, Ho Si Thoang

Tóm tắt

The catalyst 7.5% NiO/TiO2 and seven samples of NiO/
-Al2O3 with NiO content
from 7.5% to 60% have been obtained and studied. Physico-chemical characteristics of the catalysts
were determined by methods of Adsorption (BET), X-ray Diffraction (XRD), Temperature-
Programmed Reduction (TPR) and Hydrogen Pulse Titration. The catalytic properties of the
obtained samples were investigated in the reaction of CO methanation at temperatures 180 –
220C and mole ratios hydrogen/carbon monoxide 25-100. It has been found that the optimal
regime for catalyst treatment is calcination at 600C and reduction at 400C. The catalyst 7.5%
NiO/TiO2 expressed very high activity but in case of NiO/Al2O3 for having high activity it was
necessary to raise the content of NiO up to 37.7%. This catalyst has been indicated to be the
most active in all the studied conditions. The determining factors for expressing high activity in
the catalyst 7.5% NiO/TiO2 are the presence of spinel NiTiO3 and the optimal average size of
nickel assemblies but in the catalyst 37.7% NiO/Al2O3 – the optimal size of active centers, big
values of specific surface area and content of NiO and the high thermal stability.