Chemistry of supported Ru: CO-induced oxidation Ru at 310 K

Journal Article · Sun Jan 01 04:00:00 EST 1989 · Journal of Catalysis; (USA)

DOI:https://doi.org/10.1016/0021-9517(89)90012-2· OSTI ID:7130567

Robbins, J L ^[1]

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1. Exxon Corporate Research Science Labs, Annandale, NJ (USA)

Infrared spectra of CO on reduced titania-supported Ru show three bands at 2060, 2085, and 2140 cm{sup {minus}1}. The first band saturates almost instantly in excess CO and exhibits coverage-dependent frequencies at subsaturation which are consistent with its assignment to CO in on-top sites on the anticipated Ru crystallites. The latter two bands grow slowly as a pair in several Torr Co at 310 K, and their growth rate is accelerated at 400 K. IR spectra measured in mixtures of isotopically labeled Co show the two high-frequency bands represent coupled vibrations of an Ru(CO){sub x} (x > 2) species. The observed frequencies correlate with those expected for a Ru(II) species and XPS shows that a fraction of the zero-valent Ru present on a reduced sample is converted to a higher valent species upon exposure to CO at 310 K. The author therefore assign the 2085- and 2140-cm{sup {minus}1} IR bands to (TiO){sub 2}Ru(CO){sub 3} surface species. He also proposes these species form via an oxidative fragmentation reaction involving zero-valent Ru, CO, and surface hydroxyls on the support.

• OSTI ID: 7130567
• Journal Information: Journal of Catalysis; (USA), Journal Name: Journal of Catalysis; (USA) Vol. 115:1; ISSN 0021-9517; ISSN JCTLA
• Country of Publication: United States
• Language: English

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