JOURNAL OF CHEMICAL ENGINEERING OF JAPAN
Print ISSN : 0021-9592
Catalysis, Kinetics and Reactor Design
Deterioration Mechanism of Direct Internal Reforming Catalyst
Mitsuie MatsumuraChika Hirai
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1998 Volume 31 Issue 5 Pages 734-740

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Abstract

The deterioration mechanism of reforming catalysts used for internal reforming molten carbonate fuel cells is studied through post-test analyses of the used catalysts. The catalysts studied are Ni/MgO-Al2O3. Deactivation of the catalysts is caused both by a decrease in Ni surface area of the catalyst and by loss of specific activity of the Ni surface (alkali poisoning). The decrease in Ni surface area is characterized firstly by accelerated sintering of Ni particles due to the existence of alkali metals (attached electrolyte). Secondly, sulfur poisoning also plays an important role, especially for sintered catalysts with small Ni surface areas. As for the effect of alkali poisoning, the specific activity of the Ni surface decreases to 15–60% of the original one. Blockage of pore structure by the electrolyte does not seem to be important for the loss of Ni surface area.

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© 1998 The Society of Chemical Engineers, Japan
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