Electronic effects of alkaline carbonates in methanation over Pd/Al2O3 catalysts

Toshiaki Mori, Hiroyuki Masuda, Hisao Imai, Akira Miyamoto, Hiroshi Niizuma, Tadashi Hattori, Yuichi Murakami

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Abstract

Electronic effects of alkaline carbonates on the C-O bond dissociation of adsorbed CO in methanation over Pd/Al2O3 catalysts were investigated by using a pulse surface reaction rate analysis (PSRA) coupled with an emissionless diffuse reflectance infrared spectroscopy (EDR). Alkaline carbonates added to the Pd/Al2O3 catalyst exist mainly on the alumina support. This addition causes the IR bands of adsorbed CO to shift to lower frequencies, and markedly decreases the rate constant for the C-O bond dissociation. It was concluded that the addition of alkaline carbonates to the Pd/Al2O3 catalyst increases the electron density of the Pd metal which in turn decreases the rate constant for the C-O bond dissociation of adsorbed CO. This relationship was explained in terms of a partially hydrogenated CO species which acts as intermediate for the C-O bond dissociation of adsorbed CO in methanation.

Original languageEnglish
Pages (from-to)263-271
Number of pages9
JournalJournal of Molecular Catalysis
Volume25
Issue number1-3
DOIs
Publication statusPublished - 1984 Jul

ASJC Scopus subject areas

  • Engineering(all)

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    Mori, T., Masuda, H., Imai, H., Miyamoto, A., Niizuma, H., Hattori, T., & Murakami, Y. (1984). Electronic effects of alkaline carbonates in methanation over Pd/Al2O3 catalysts. Journal of Molecular Catalysis, 25(1-3), 263-271. https://doi.org/10.1016/0304-5102(84)80049-8