Bifunctional Catalysts of Halogen–Free Carbonylation of Diemthyl Ether into Methylacetate
G. G. Volkova and E. A. Paukshtis
Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, Pr. Akademika Lavrentyeva 5, Novosibirsk 630090 (Russia)
Keywords: carbonylation, dimethyl ether, methylacetate, acid cesium salt, heteropolyacid
Abstract
Acid centres of bifunctional catalysts Rh/SO4/ZrO2, Rh/WOx/ZrO2 and Rh/CsхH3–хРW12O40 were studied by means of IR spectroscopy of adsorbed pyridine. The effect of type, concentration and strength of acid centres on the activity and selectivity of catalysts in halogen-free carbonylation of dimethyl ether was established. It was demonstrated that the most efficient catalysts are those with the high concentration of strong Brøensted acid centres Rh/CsхH3–хРW12O40 (1.5 ≤ x ≤ 2).
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