Methanol Dehydrogenation to Methyl Formate Catalyzed by Cu/SiO2 Catalysts: Impact of Precipitation Procedure and Calcination Temperature

Considered three options for the synthesis of a catalyst by the precipitation method, the Cu/SiO 2 catalysts prepared by varying the precipitation procedure and calcination temperature for the dehydrogenation of methanol was investigated. When the CuO/SiO 2 catalyst precursors were prepared by the a...

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Veröffentlicht in:Russian journal of applied chemistry 2021-09, Vol.94 (9), p.1302-1312
Hauptverfasser: Wang, A. L., Ye, C. L., Jia, X. Y., Yin, H. B.
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Sprache:eng
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Zusammenfassung:Considered three options for the synthesis of a catalyst by the precipitation method, the Cu/SiO 2 catalysts prepared by varying the precipitation procedure and calcination temperature for the dehydrogenation of methanol was investigated. When the CuO/SiO 2 catalyst precursors were prepared by the addition of a copper nitrate aqueous solution into an ammonia aqueous solution (reverse precipitation) and co-current flow addition of both aqueous solutions, after reduction with gaseous hydrogen, small-sized metallic copper nanocrystallites were formed in the reduced Cu/SiO 2 catalysts as compared to those prepared by the addition of an ammonia aqueous solution into a copper nitrate aqueous solution (direct precipitation). The reduced Cu/SiO 2 catalysts prepared by the reverse precipitation method with relatively lower acidity and basicity exhibited higher catalytic activity for the formation of methyl formate in methanol dehydrogenation. The reduced Cu/SiO 2 catalysts prepared by the calcination at a lower temperature exhibited higher catalytic activity for the formation of methyl formate. The surface metallic Cu 0 and Cu + species catalyzed the methanol dehydrogenation to methyl formate, meanwhile the surface Cu + cations enhanced the decomposition of the resultant methyl formate to CO and H 2 .
ISSN:1070-4272
1608-3296
DOI:10.1134/S1070427221090135