Regulating the location of the metal promoters plays a vital role in catalyst structure and its catalytic behavior during CO_(2)hydrogenation to higher alcohols.Herein,we selected the metal promoters with a precipitat...Regulating the location of the metal promoters plays a vital role in catalyst structure and its catalytic behavior during CO_(2)hydrogenation to higher alcohols.Herein,we selected the metal promoters with a precipitation pH similar to that of Cu^(2+)or Fe^(3+)to prepare a series of CuFe-based catalysts.Characterization results show that doping Al or Cr promoter,located with the Fe phase,suppressed the excessive carburization of the Fe phase and maintained an optimal proportion between Fe_(3)O_(4) and amorphous iron carbide(FeC_(x)),thus exhibiting superior catalytic activity and stability.In contrast,doping Zn or In promoter,located with the Cu phase,underwent a deeper carburization and formed more crys-talline FeC_(x),showing an inferior performance.The CuFeCr catalyst achieved the highest space-time yield of 330 mg g_(cat)^(-1)h^(-1)for higher alcohols among these catalysts.This study provides a novel strategy for opti-mizing the structure of the active phases for CO_(2)hydrogenation.展开更多
基金financially supported by the National Key R&D Program of China (2023YFB4104501)the National Natural Science Foundation of China (22372165)+2 种基金the Liaoning Binhai Laboratory (LBLA-2024-01)the Grant. YLU-DNL Fund (2023001)DICP (Grant: DICP I202457)
文摘Regulating the location of the metal promoters plays a vital role in catalyst structure and its catalytic behavior during CO_(2)hydrogenation to higher alcohols.Herein,we selected the metal promoters with a precipitation pH similar to that of Cu^(2+)or Fe^(3+)to prepare a series of CuFe-based catalysts.Characterization results show that doping Al or Cr promoter,located with the Fe phase,suppressed the excessive carburization of the Fe phase and maintained an optimal proportion between Fe_(3)O_(4) and amorphous iron carbide(FeC_(x)),thus exhibiting superior catalytic activity and stability.In contrast,doping Zn or In promoter,located with the Cu phase,underwent a deeper carburization and formed more crys-talline FeC_(x),showing an inferior performance.The CuFeCr catalyst achieved the highest space-time yield of 330 mg g_(cat)^(-1)h^(-1)for higher alcohols among these catalysts.This study provides a novel strategy for opti-mizing the structure of the active phases for CO_(2)hydrogenation.
