Effect of Pulse Deposition Process Frequency Parameters on Hydrogenation Performance of Nickel-Based Catalysts
To prepare Ni-Mo alloy electrode on carbon paper substrate by pulsed electro-deposition to improve the hydrogenation efficiency of electrolytic water hydrogenation.Catalysts were prepared by electrochemical workstation at different pulse frequencies.Scanning electron microscopy(SEM),X-ray diffraction analyzer(XRD),energy dispersive spectrometer(EDS)and gas chromatography-mass spectrometry(GCMS)were used to characterize the surface morphology,phase structure and element content of each catalyst prepared at different frequencies,as well as the product content after hydrogenation,and to find the best pulse frequency.The optimal pulse frequency was 300 Hz,the Ni content on the catalyst surface decreased with the decrease of pulse frequency,and the surface grain size also decreased,but the distribution of Ni did not follow this rule,and the catalyst surface deposited at 300 Hz reached the optimal catalytic structure,uniform distribution,loose and porous.In this state,the hydrogenation catalytic efficiency of the catalyst reached the best,the yield of 1,2,3,4-tetrahydroquinoxaline was the highest.Under the same other conditions,the frequency change of electrochemical catalyst prepared by pulsed electrodeposition has a certain influence on the hydrogenation result,but the decisive role is the morphology distribution of deposited metal on the catalyst surface,and the frequency has a certain influence on the surface morphology,When the appropriate pulse frequency is found,the best hydrogenation catalytic effect can be obtained.
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