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Language: English

Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received October 31, 2003
Accepted December 29, 2003

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Nickel-Calcium Phosphate/Hydroxyapatite Catalysts for Partial Oxidation of Methane to Syngas: Effect of Composition

Jin Hyuk Jun Kyeong Sook Jeong Tae-Jin Lee¹ Sang Jun Kong² Tae Hoon Lim² Suk-Woo Nam² Seong-Ahn Hong² Ki June Yoon^†

Department of Chemical Engineering, Sungkyunkwan University, Suwon 440-746, Korea ¹School of Chemical Engineering & Technology, Yeungnam University, Kyongsan 712-749, Korea ²Battery and Fuel Cell Research Center, Korea Institute of Science and Technology, Seoul 136-791, Korea

Korean Journal of Chemical Engineering, January 2004, 21(1), 140-146(7), 10.1007/BF02705392

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Abstract

Nickel-calcium phosphate/hydroxyapatite catalysts have recently been reported to exhibit high activity and selectivity in partial oxidation of methane (POM). In this work the optimum composition was determined. The optimum mole ratio of Ca/PO₄ was around 10/6 and that of Ni/PO₄ was in a range from 1.0/6 to 3.0/6 with the optimum Ca/PO₄, and the activity could be related with the amount of metallic nickel. In a temperature range from ca. 400 to 700 K, an apparent autothermal reaction was observed to occur in some cases. This is due to the fact that the actual catalyst temperature is higher than the measured temperature, which comes from the exothermic nature of the reaction. The mixing sequence of the precursors during the catalyst preparation does little affect the catalyst activity and characteristics. Deactivation of the catalyst occurred slowly, but the catalyst could easily be regenerated. Moreover, the nickel-calcium phosphate/hydroxyapatite catalyst showed higher activity than the nickel-strontium phosphate catalyst.

Keywords

Calcium Hydroxyapatite Calcium Phosphate Nickel Optimum Composition Partial Oxidation of Methane

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