Selectivity of bifunctional zeolite catalysts for the transformation of methanol to acetaldehyde and benzaldehyde

Methanol may be in the temperature range 350–500°C catalytically oxidized in one step to acetaldehyde and benzaldehyde over bifunctional catalysts containing the redox active component bi–Mo–O together with the HZSM-5 zeolite. In comparison with HZSM-5 zeolite alone (without the redox active component Bi–Mo–O) a 15 times higher selectivity to C₂+ aldehydes was attained. The analysis of the infrared spectra of the surface complexes of methanol formed in its interaction with the proton donor sites of the bifunctional catalyst at 400°C led to the suggestion of the probable mechanism of the oxidative transformation of methanol to higher aldehydes.

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350–500°C , , - Bi–Mo–O HZSM-5.