Journal of the Chemical Society - Faraday Transactions p. 3605 - 3610 (1992)
Update date:2022-08-17
Topics:
Uragami, Yuji
Otsuka, Kiyoshi
Direct conversion of ethane to acetaldehyde by partial oxidation with oxygen proceeds selectively on BPO4 modified with basic oxides.The contribution of homogeneous reactions in the gas phase to the catalytic process can be neglected under the experimental conditions of this work.The kinetic results obtained for ZnO-added BPO4 suggest that CH3CHO and C2H4 are produced in parallel via a common reaction intermediate.This intermediate was assumed to be ethyl peroxide formed from an ethyl intermediate and O2.The role of basic oxides is to increase the basicity of the active site -B-O-, resulting in an increase in the rate of heterolytic splitting of C-H bond on the site.The NH3 temperature-programmed desorption (TPD) studies have suggested a weakening of the acidic strength of the host BPO4 catalyst by addition of ZnO, MgO and CaO.This modification decreases the apparent activation energy of the conversion of C2H6, especially for the conversion to CH3CHO.
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