Preparation of efficient and stable Pd-Fe/AC bimetallic catalysts by coupling method
Pd-Fe/AC bimetallic catalyst is widely used in metallurgy,chemical engineering and environmental industry.However,due to the limitation of preparation methods,the active substances of Pd-Fe bimetallic catalyst prepared by traditional liquid reduction method is easy to agglomerate and the particle size is difficult to control.Pd-Fe/AC bimetallic catalyst was prepared by ultrasonic impregnation and followed by ultrasonic liquid reduction method with activated carbon as carrier.The catalyst was characterized by FTIR,XRD,HRTEM and XPS,then the performance of the catalyst was evaluated by volt-ampere characteristic curve and chronoamperometry.The results show that the optimum modification process of activated carbon carrier is as follow:mass fraction 15％HNO3,reaction temperature 50 ℃,reaction time 1 h.The particle size of the active component in the catalyst is 6.27 nm,and the lattice spacing is 0.222 nm.Electrochemical tests show that the catalyst prepared by the coupling method has a catalytic activity of 14％higher than that of the liquid reduction method,and maintains higher electrochemical stability.The results show that the coupling method can prepare a more efficient and stable Pd-Fe/AC bimetallic catalyst than the ultrasonic liquid reduction method.
carrier modificationpreparation by coupling methodelectrochemistrycatalytic performance
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