Active sites for methanol dehydrogenation to formaldehyde on sodium-modified silicalite-1

Journal Article · Sun Sep 01 04:00:00 EDT 1991 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1016/0021-9517(91)90339-6· OSTI ID:5784960

Matsumura, Yasuyuki; Hashimoto, Keiji ^[1]; Yoshida, Satohiro ^[2]

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1. Osaka Municipal Technical Research Inst. (Japan)
2. Kyoto Univ. (Japan)

In order to elucidate active sites for selective dehydrogenation of methanol to formaldehyde on sodium-modified silicalite-1, adsorption of methanol on sodium-modified and -unmodified silicalite-1 has been investigated by a temperature-programmed desorption technique, infrared spectroscopy, and ab initio molecular orbital calculations. In sodium-modified silicalite-1, three kinds of the adsorption sites are present, that is, silanol sites, sodium-ion sites, and active oxygen bridge sites. Dissociative adsorption of methanol on the active oxygen bridge probably causes generation of silanol and methoxyl groups on the silicalite surface. by heating a sodium-modified silicalite-1 sample at 970 K, the number of the active oxygen bridges increased compared with that for the sample preheated at 770 K and its catalytic activity for methanol dehydrogenation also increased. Thus, it is proposed that methanol dehydrogenation is driven by the active oxygen bridges.

• OSTI ID: 5784960
• Journal Information: Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 131:1; ISSN 0021-9517; ISSN JCTLA
• Country of Publication: United States
• Language: English

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