Gas-phase epoxidation of propylene by molecular oxygen over Ag-CuCl2/BaCO3 catalyst with low CuCl2 doping: Catalytic performance, deactivation and regeneration
作者： Qing Zhang , Guangtao Chai , Yanglong Guo , Wangcheng Zhan , Yun Guo
DOI: 10.1016/J.MOLCATA.2016.08.019
关键词:
摘要: Abstract Ag-MCl x /BaCO 3 catalysts with different chloride promoters, prepared by reduction-deposition-impregnation method, were investigated for gas-phase epoxidation of propylene to oxide (PO) molecular oxygen. Ag-CuCl 2 catalyst 360 ppm Cu and 400 ppm Cl exhibits the best initial catalytic performance, in which PO selectivity 71.2% conversion 1.3% are achieved, but only 13.9% is obtained at 3.2% after reaction 500 min. The mechanism over follows Rideal-Eley mechanism, gas phase reacts oxygen species adsorbed on surface Ag interface close contact CuCl produce PO, atomic nanoparticles CO H O. One atom form a molecule, left insufficient atoms react oxygen-containing intermediates then coke deposition covers active sites thus results deactivation. deactivated can be completely regenerated combustion impregnation appropriate amount Cl.
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