Fine analysis of by-products of the selective oxidation of isobutane into methacrolein and methacrylic acid over Mo–V–P catalyst

The nature of the products of the selective oxidation of isobutane into methacrolein and methacrylic acid over a Mo–V–P Keggin-type-structure catalyst was investigated at 593 K. Gas chromatography/mass spectrometry and 1H and 13C NMR were complementary analytical methods to identify by-products. The quantification was realised by 1H NMR and gas chromatography. Aromatic and linear carbon backbone products detected suggested that an isomerization occurred during the oxidation of isobutane. A better knowledge of the nature of the acid site on which isomerization occurs might design a powerful catalyst.

Graphical abstractThe brackets refer to a substrate adsorbed on a acid site.Figure optionsDownload full-size imageDownload as PowerPoint slide