Highly effective perovskite-type BaZrO3 supported Ru catalyst for ammonia synthesis

Authors: Ziqing Wang, Benyao Liu, Jianxin Lin

Abstract:
The ammonia synthesis was performed over Ru catalyst supported on perovskite-type BaZrO₃. Physiochemical properties of this catalyst were also characterized by means of various techniques to show the relationships between catalyst structure and catalytic performance. It was found that the ammonia concentration in the effluent of Ru/BaZrO₃ catalyst was 6.36% at 673K under 3.0 MPa, which was much higher than that of Ru catalyst supported on other supports including carbon material systems under the similar conditions, and the rate did not decrease even if the reaction was executed for 120 h. This might be attributed to the facts that the optimum size of Ru particles has more B5-type sites, strong electrondonating ability of the BaZrO₃ support and the strong metal–support interaction provides an efficient channel for electron transfer. On the other hand, the adsorption of H₂ was inhibited over the surface of this catalyst and the number of active sites for the activation of N₂ was also increased.

Keywords:
Barium zirconate
Strong metal–support interaction
Ru catalyst
Ammonia synthesis
H2 poisoning

Published in: Applied catalysis A: General  (Volume 458, Pages 1-206, 10 May 2013)

Publisher: Elsevier

ISSN Information: 0926-860X

Highly effective perovskite-type BaZrO3 supported Ru catalyst for ammonia synthesis

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