Effect of strong metal-support interaction on the rate of hydrogenation of adsorbed carbon monoxide over titania-supported noble metal catalysts as revealed by pulse surface reaction rate analysis

Journal Article · Wed Mar 01 04:00:00 EST 1989 · Journal of Catalysis; (USA)

DOI:https://doi.org/10.1016/0021-9517(89)90079-1· OSTI ID:6224055

Taniguchi, Shigeyoshi; Mori, Yoshihiko; Hattori, Tadashi; Murakami, Yuichi ^[1]; Mori, Toshiaki ^[2]

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1. Nagoya Univ. (Japan)
2. Government Industrial Research Institute, Nagoya (Japan)

On the basis of the rate constant per active site determined by pulse surface reaction rate analysis (PSRA), the effect of the strong metal-support interaction (SMSI) on the hydrogenation of adsorbed CO was studied for titania-supported noble metal catalysts. Reduction at 773 K resulted in a drastic decrease in the amount of CO adsorbed on all noble metals examined. The observed suppression of CO chemisorption resulted mainly from SMSI, because the chemisorption ability was restored considerably by heating these catalysts in an O{sub 2} atmosphere and then reducing at 523 K. It was found that the effect of SMSI on the hydrogenation of adsorbed CO was different from one noble metal to another, although its effect on CO chemisorption was common to all titania-supported noble metals. Pt and Pd exhibited a much higher hydrogenation activity in their SMSI state than in their normal state, whereas Rh, Ru, and Ir exhibited almost the same activity in both states. By heating titania-supported Pt and Pd in O{sub 2} and then reducing at 523 K, concomitant with destruction of the SMSI state, the high hydrogenation activity disappeared to near each original value. Subsequent reduction at 773 K again brought these catalysts to the SMSI state, accompanied by an increase in their activity. From these results, a possible cause is discussed for the high activity on Pt and Pd in the SMSI state and for its absence on Rh, Ru, and Ir in the SMSI state.

• OSTI ID: 6224055
• Journal Information: Journal of Catalysis; (USA), Journal Name: Journal of Catalysis; (USA) Vol. 116:1; ISSN 0021-9517; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010408* -- Coal
Lignite
& Peat-- C1 Processes-- (1987-)
ADSORPTION
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSIS
CATALYST SUPPORTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISORPTION
ELEMENTS
HEAT TREATMENTS
HIGH TEMPERATURE
HYDROGENATION
IRIDIUM
KINETICS
METALS
METHANATION
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PALLADIUM
PLATINUM
PLATINUM METALS
REACTION KINETICS
REDUCTION
RHODIUM
RUTHENIUM
SEPARATION PROCESSES
SORPTION
TEMPERATURE DEPENDENCE
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS