Partial oxidation of methane to synthesis gas over Co/Ca/Al2O3 catalysts

✍ Scribed by X.X. Gao; C.J. Huang; N.W. Zhang; J.H. Li; W.Z. Weng; H.L. Wan

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 901 KB
• Volume: 131
• Category: Article
• ISSN: 0920-5861
• DOI: 10.1016/j.cattod.2007.10.051

✦ Synopsis

A series of calcium-modified alumina-supported cobalt catalysts were prepared with a two-step impregnation method, and the effect of calcium on the catalytic performances of the catalysts for the partial oxidation of methane to syngas (CO and H 2 ) was investigated at 750 8C. Also, the catalysts were characterized by XRD, TEM, TPR and (in situ) Raman. At 6 wt.% of cobalt loading, the unmodified alumina-supported cobalt catalyst showed a very low activity and a rapid deactivation, while the calcium-modified catalyst presented a good performance for this process with the CH 4 conversion of $88%, CO selectivity of $94% and undetectable carbon deposition during a long-time running. Characterization results showed that the calcium modification can effectively increase the dispersion and reducibility of Co 3 O 4 , decrease the Co metal particle size, and suppress the reoxidation of cobalt as well as the phase transformation to form CoAl 2 O 4 spinel phases under the reaction conditions. These could be related to the excellent catalytic performances of Co/Ca/Al 2 O 3 catalysts.