Ni-based catalyst derived from Ni/Mg/Al hydrotalcite-like compounds and its activity in the methanation of carbon monoxide.

Li, Zhenhua; Bian, Li; Zhu, Qiujun; Wang, Weihan

The supported Ni-based catalyst is widely used in the methanation process. Nevertheless, the major disadvantages of this catalyst are a poor behavior in the water-gas-shift ( WGS) reaction and the deactivation at higher temperatures. A new kind of catalyst, nickel-containing oxides catalyst (NiMgAl), obtained from thermal treatment of hydrotalcite-like compounds (HTlcs) was prepared using the co-precipitation method. The performance of this catalyst was systematically investigated and compared with that of the Ni/AlO catalyst. It was found that the NiMgAl catalyst shows an enhanced methanation activity compared to that of the Ni/AlO catalyst and the former catalyst shows a better performance for the methanation especially at temperature over 550°C. Three NiMgAl catalysts with different nickel content were prepared and tested in the methanation operated at a GHSV of 15000 h and n(H)/n(CO) of 1.5. The results indicate that with the NiMg8 catalyst a higher activity and stability could be achieved than with the NiMg5 and NiMg6 samples, the effect mainly attributed to a higher extent of Ni dispersion was confirmed by XRD results.

NICKEL catalysts; MAGNESIUM compounds; ALUMINUM compounds; METHANATION; CARBON monoxide; TEMPERATURE effect; CATALYST poisoning

Kinetics & Catalysis, 2014, Vol 55, Issue 2, p217

0023-1584

Academic Journal

10.1134/S0023158414020049