Ethanol dehydrogenation to acetaldehyde over a Cuδ+-based Cu-MFI catalyst

Copper catalysts have been extensively investigated for the dehydrogenation of ethanol to acetaldehyde. However, identifying essential active sites this reaction is difficult because complex coordination structure and variable valences Cu species during reaction. The stability in also needs be substantially improved. In study, Cu-MFI, a well-defined Cu-based Lewis acid catalyst, was prepared using post-acid treatment method dehydrogenation. Different from widely reported Cu+ Cu0 accounting activity catalysts, conditional experiments situ characterizations revealed that highly dispersed Cuδ+ (1 < δ 2) on MFI support are Due strong interaction between silica via Cu–O–Si linkage, were very stable played role catalyst promoting activation Over optimal 5%Cu-MFI-deCu, 95% selectivity acetaldehyde approximately 87% conversion obtained at 250 °C weight hourly space velocity 0.64 h−1 120 h time stream.