脉冲沉积工艺频率参数对镍基催化剂加氢催化性能的影响  

Effect of Pulse Deposition Process Frequency Parameters on Hydrogenation Performance of Nickel-Based Catalysts

作　　者：谢其均 郑欣 李寒煜 张胜寒 Xie Qijun;Zheng Xin;Li Hanyu;Zhang Shenghan(Department of Environmental Science and Engineering,North China Electric Power University Baoding Campus,Baoding 071003,China;Electrical science Institute of Yunnan Power Grid Co.,Ltd.,Kunming 675217,China)

机构地区：[1]华北电力大学(保定)环境科学与工程系,河北保定071003 [2]云南电网有限责任公司电力科学研究院,云南昆明675217

出　　处：《山东化工》2024年第16期24-27,共4页Shandong Chemical Industry

基　　金：云南电科院2022年电化学加氢技术研究与检测设备试制(技术研究部分)(0562002022030304JS0003)。

摘　　要：目的:采用脉冲电沉积法在碳纸基底上制备镍-钼合金电极作为催化剂,提高电解水加氢过程中的加氢效率。方法:使用电化学工作站以不同脉冲频率制备催化剂,使用扫描电镜(SEM)、X射线衍射分析仪(XRD)、能谱仪(EDS)、气相色谱-质谱联动仪(GCMS)对不同频率下制备出的各催化剂表面形貌、相结构、元素含量以及用于加氢后的产物含量进行表征分析,找到最佳的脉冲频率。结果:最佳的脉冲频率为300 Hz,催化剂表面的Ni含量随着脉冲频率的降低而减少,且表面晶粒尺寸也随之下降,但Ni的分布并不遵循这种规律,在300 Hz频率下沉积出的催化剂表面达到了最佳催化结构,分布均匀,疏松多孔,该状态下的催化剂的加氢催化效率达到最佳,1,2,3,4-四氢喹喔啉的产量达到最高。结论:在其他条件相同的情况下,以脉冲电沉积的方法制备电化学催化剂的频率变化对加氢结果具有一定的影响因素,但起决定性作用的是所沉积的金属在催化剂表面的形貌分布,而频率的高低对表面形貌有一定的影响,在找到合适的脉冲频率时,能获得最佳的加氢催化效果。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.

关 键 词：脉冲电沉积 加氢催化 频率 电化学 

分 类 号：TQ153.4[化学工程—电化学工业]