Abstract
The adsorption of crotonaldehyde and maleic anhydride on MoO 3, respectively, V 2O 5 has been studied by FTIR spectroscopy. Crotonaldehyde was adsorbed mainly in molecular form due to hydrogen bonds with Brönsted acid sites of these oxides (physical adsorption) at room temperature (RT). Stable surface complexes (coordinatively bonded crotonaldehyde, carbonyl compounds and carboxylates) were found during the adsorption of crotonaldehyde on MoO 3, respectively, V 2O 5 at 298–573 K. Carboxylates and consecutively maleic anhydride were products of reaction between crotonaldehyde and active sites of V 2O 5 surface at high temperatures in the atmosphere of reaction gas. Maleic anhydride was physically adsorbed on MoO 3, respectively, V 2O 5 via hydrogen bonds with surface hydroxyls.
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