Thermostable Rh Catalysts Supported on Metal Phosphates

The catalytic activity and thermostability of Rh catalysts (0.4% loading) have been studied using various metal phosphates (B, Al, Ga, Y, La, Pr, Zr, and Ce) as support materials. Temperature-programmed reactions of mixtures of NO, CO, C3H6, and O2 with the stoichiometric A/F ratio (14.6) exhibited...

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Bibliographic Details
Published in:Bulletin of the Chemical Society of Japan 2010-03, Vol.83 (3), p.291
Main Authors: Ikeue, Keita, Murakami, Kyosuke, Hinokuma, Satoshi, Uemura, Kosuke, Zhang, Dongjie, Machida, Masato
Format: Article
Language:English
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Summary:The catalytic activity and thermostability of Rh catalysts (0.4% loading) have been studied using various metal phosphates (B, Al, Ga, Y, La, Pr, Zr, and Ce) as support materials. Temperature-programmed reactions of mixtures of NO, CO, C3H6, and O2 with the stoichiometric A/F ratio (14.6) exhibited a steep rise in conversion efficiency as a common feature of Rh supported on metal phosphates. The activity of Rh/AlPO4 was found to be the highest even after aging at 900 °C for 25 h in a stream of 10% H2O/air. Among four types of AlPO4 polymorphs having different BET surface area, i.e, berlinite (5 m2 g-1), cristobalite (1 m2 g-1), tridymite (82 m2 g-1), and microporous AlPO4-5 (330 m2 g-1), tridymite AlPO4 achieved the lowest light-off temperature. The slow grain growth of tridymite AlPO4 at ≤1000 °C is a possible reason for the stability against sintering, whereas one-dimensional micropores of AlPO4-5 are unstable in the high-temperature steam.
ISSN:0009-2673
1348-0634