Infrared study of the CO insertion reaction on reduced, oxidized and sulfided Rh/SiO[sub 2] catalysts

Journal Article · Mon Jun 01 00:00:00 EDT 1992 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1016/0021-9517(92)90058-P· OSTI ID:7026643

Chuang, S S.C.; Pien, S I ^[1]

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1. Univ. of Akron, OH (United States)

The reaction of adsorbed CO with C[sub 2]H[sub 4]/H[sub 2] and ethylene hydroformylation over reduced, oxidized, and sulfided Rh/SiO[sub 2] catalysts has been investigated under reaction conditions by in situ infrared spectroscopy. Both reactions involve the CO insertion step resulting in the formation of propionaldehyde. The linear CO adsorbed on the Rh[sup 0] site of the reduced Rh/SiO[sub 2] and the linear CO adsorbed on the Rh[sup +] site of the oxidized Rh/SiO[sub 2] are consumed and propionaldehyde is produced as the adsorbed CO reacts with C[sub 2]H[sub 4] and H[sub 2]. The results show that both single Rh[sup 0] atoms and Rh[sup +] ion sites are active for the CO insertion reaction. In situ infrared observations of steady-state ethylene hydroformylation show that the oxidized Rh/SiO[sub 2] containing considerable amounts of Rh[sup +] sites exhibits rate and selectivity for the formation of propionaldehyde higher than those of the reduced Rh/SiO[sub 2]; the sulfided Rh/SiO[sub 2] comprising mainly single Rh sites shows rate and selectivity for the formation of propionaldehyde higher than that of the reduced Rh/SiO[sub 2]. The low selectivity of the reduced Rh/SiO[sub 2] for ethylene hydroformylation is attributed to the higher hydrogenation activity of the Rh crystallite surface on the reduced Rh/SiO[sub 2].

• OSTI ID: 7026643
• Journal Information: Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 135:2; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

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ABSORPTION SPECTROSCOPY
ACYLATION
ALDEHYDES
ALKENES
CARBONYLATION
CARBOXYLIC ACID SALTS
CATALYSIS
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
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FISCHER-TROPSCH SYNTHESIS
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HYDROCARBONS
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INFRARED RADIATION
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PLATINUM METALS
RADIATIONS
REACTION KINETICS
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RHODIUM
RHODIUM COMPOUNDS
RHODIUM OXIDES
RHODIUM SULFIDES
SILICON COMPOUNDS
SILICON OXIDES
SPECTROSCOPY
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SULFUR COMPOUNDS
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS