Methoxy formation/spillover on Pd/Al2O3 studied by 13C, 1H NMR

Oc Hee Han; Gustavo Larsen; Kurt W. Zilm; Gary L. Haller

doi:10.1016/S0167-2991(08)63179-1

Methoxy formation/spillover on Pd/Al₂O₃ studied by ¹³C, ¹H NMR

Oc Hee Han, Gustavo Larsen, Kurt W. Zilm, Gary L. Haller

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1 Scopus citations

Abstract

The reaction of H₂ with ¹³CO adsorbed on Pd/Al₂O₃ has been investigated by solid state ¹³C NMR. As the reaction proceeds, the peak for adsorbed CO on the Pd particles decreases while the intensity of a new peak near 60 ppm increases. This new peak is tentatively assigned to methoxy groups. When the sample was annealed at temperatures higher than 180°C, gas phase CH₄ was observed as a sharp peak near -10 ppm. The metallic character of the Pd particles was studied by observing the first moment and spin lattice relaxation time of the ¹³CO on Pd which changed as the reaction progressed. Proton NMR was also employed to confirm the assignment of ¹³C peaks as well as the presence of palladium hydride.

Original language	English (US)
Pages (from-to)	223-228
Number of pages	6
Journal	Studies in Surface Science and Catalysis
Volume	77
Issue number	C
DOIs	https://doi.org/10.1016/S0167-2991(08)63179-1
State	Published - Jan 1 1993

ASJC Scopus subject areas

Catalysis
Condensed Matter Physics
Physical and Theoretical Chemistry
Surfaces, Coatings and Films
Materials Chemistry

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Han, O. H., Larsen, G., Zilm, K. W., & Haller, G. L. (1993). Methoxy formation/spillover on Pd/Al₂O₃ studied by ¹³C, ¹H NMR. Studies in Surface Science and Catalysis, 77(C), 223-228. https://doi.org/10.1016/S0167-2991(08)63179-1

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abstract = "The reaction of H2 with 13CO adsorbed on Pd/Al2O3 has been investigated by solid state 13C NMR. As the reaction proceeds, the peak for adsorbed CO on the Pd particles decreases while the intensity of a new peak near 60 ppm increases. This new peak is tentatively assigned to methoxy groups. When the sample was annealed at temperatures higher than 180°C, gas phase CH4 was observed as a sharp peak near -10 ppm. The metallic character of the Pd particles was studied by observing the first moment and spin lattice relaxation time of the 13CO on Pd which changed as the reaction progressed. Proton NMR was also employed to confirm the assignment of 13C peaks as well as the presence of palladium hydride.",

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AB - The reaction of H2 with 13CO adsorbed on Pd/Al2O3 has been investigated by solid state 13C NMR. As the reaction proceeds, the peak for adsorbed CO on the Pd particles decreases while the intensity of a new peak near 60 ppm increases. This new peak is tentatively assigned to methoxy groups. When the sample was annealed at temperatures higher than 180°C, gas phase CH4 was observed as a sharp peak near -10 ppm. The metallic character of the Pd particles was studied by observing the first moment and spin lattice relaxation time of the 13CO on Pd which changed as the reaction progressed. Proton NMR was also employed to confirm the assignment of 13C peaks as well as the presence of palladium hydride.

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