Oxidative coupling of bio-alcohols mixture over hierarchically porous perovskite catalysts for sustainable acrolein production.

The acrolein production from bio-alcohols methanol and ethanol mixtures using AMnO (since A = Ba and/or Sr) perovskite catalysts was studied. All the prepared samples were characterized by XRD, XPS, N sorption, FTIR, Raman spectroscopy, TEM, SEM, TGA, and NH-CO-TPD. The catalytic oxidation reaction to produce acrolein has occurred two steps, the alcohols are firstly oxidized to corresponding aldehydes, and then the aldol is coupled with the produced aldehydes. The prepared perovskite samples were modified by doping A (Sr) position with (Ba) to improve the aldol condensation. The most catalytic performance was achieved using the BaSrMnO sample in which the acrolein selectivity reached 62% ( = 300 °C, MetOH/EtOH = 1, LHSV = 10 h). The increase in acrolein production may be related to the high tendency of BaSrMnO toward C-C coupling formation. The C-C tendency attributes to that modification have occurred in acid/base sites because of metal substitution.