| THE PARTIAL COMBUSTION OF METHANE TO SYNGAS OVER PRECIOUS METALS AND NICKEL CATALYSTS SUPPORTED ON T-AL2O3 AND CE02 |
| Ho Joon Seo† |
| Division of Biotechnology and Chemical Engineering, Yosu National University, Yosu 550-747, Korea |
Corresponding Author:
Ho Joon Seo ,Tel: +82-61-659-3294, Fax: +82-61-653-3659, Email: hjseo@yosu.ac.kr
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Received: December 9, 2004; Accepted: June 10, 2005. |
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| ABSTRACT |
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The catalytic activity of precious metals(Rh, Pd, Pt) and nickel catalysts supported on T-AI2O3 and CeO? in the partial combustion of methane(PCM) to syngas was investigated based on the product distribution in a fixed bed flow reactor under atmospheric condition and also on analysis results by SEM, XPS, TPD, BET, and XRD. The activity of the catalysts based on the syngas yield increased in the sequence Rh(5)/Ce02>Ni(5)/Ce02»Rh(5)/Al203>Pd(5)/Al203>Pt(5)/Al203>Ni(5)/Al203. Compared to the precious catalysts, the syngas yield and stability of the Ni(5)/CeC>2 catalyst were almost similar to Rh(5)/Ce02 catalyst, and superior to these of any other catalysts. The syngas yield of Ni(5)/Ce02 catalyst was 90.66% at 1023 K. It could be suggested to be the redox cycle of the successive reaction and formation of active site, Ni2+ and the lattice oxygen, O2" produced due to reduction of Ce4+ to Ce3+. |
| Keywords:
Partial Combustion of Methane | Precious Metal Catalyst(Rh | Pd | Pt) | Ni Catalyst | CeO2 | AI2O3 | Redox cycle |
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