Comparative FT-IR and MAS NMR spectroscopic studies of Rh/SiO[sub 2] catalysts exposed to CO/H[sub 2] at high temperature and pressure

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

DOI:https://doi.org/10.1016/0021-9517(92)90039-K· OSTI ID:6995104

Chudek, J A; McQuire, M W; Rochester, C H ^[1]

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1. The University, Scotland (United Kingdom)

[sup 13]C and [sup 1]H MAS NMR spectra of Rh/SiO[sub 2] catalysts after exposure to methanol and ethanol at 473 K or to CO:H[sub 2] mixtures at 15 atm (ratios 1:14, 1:2 and 14:1) and 473, 523, and 553 K are reported. The NMR spectra complement FT-IR spectra and confirm that adsorbed OMe and OEt groups resulting from CO/H[sub 2] reactions over Rh/SiO[sub 2] exist predominantly on the silica surface. NMR was better than FT-IR for distinguishing adsorbed OMe, OEt, and hydrocarbon species and also enabled identification of immobile chemisorbed species and weakly adsorbed mobile product molecules. Changes in the CO:H[sub 2] ratio had a profound effect on the nature of resulting surface species in situ under reaction conditions.

• OSTI ID: 6995104
• 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
ADSORPTION
ALCOHOLS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYST SUPPORTS
CATALYSTS
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INFRARED RADIATION
INFRARED SPECTRA
INTEGRAL TRANSFORMATIONS
MAGNETIC RESONANCE
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NUCLEAR MAGNETIC RESONANCE
ORGANIC COMPOUNDS
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OXYGEN COMPOUNDS
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