碳修饰Co/ZrO_(2)催化剂的构筑及在逆水煤气反应中的应用

Construction of Co/ZrO_(2)catalyst via carbon modification strategy and its application in reverse water gas shift reaction

通过浸渍法和高温碳化法制备的氮掺杂碳表面修饰的Co/ZrO_(2)催化剂在逆水煤气变换反应(RWGS)中表现出对CO的高选择性。利用多种表征手段对催化剂的结构和电性质进行分析,并探讨了氮掺杂碳的引入对催化剂比表面积、表面碱性和CO选择性的影响。结果表明,Co/ZrO_(2)@NC-3h 700催化剂在对H_(2)吸附解离的同时,保证了充分的CO_(2)吸附,有效地减少了副产物CH_(4)的产生。在600℃苛刻温度条件下,经过24 h活性测试,Co/ZrO_(2)@NC-3h 700催化剂的CO_(2)转化率和CO选择性分别维持在35%和94%,产物CO选择性高于Co/ZrO_(2)。

Nitrogen-doped carbon surface modified Co/ZrO_(2)catalysts prepared by impregnation and high-temperature carbonization methods show high selectivity for CO in reverse water gas shift reaction(RWGS).The structural and electrical properties of the catalyst are analyzed by means of various characterization methods,and the effects of the addition of nitrogen-doped carbon on specific surface area,surface alkalinity and CO selectivity of the catalyst are studied.Studies results show that Co/ZrO_(2)@NC-3h 700 catalyst ensures sufficient CO_(2)adsorption and effectively reduces the production of CH_(4)while adsorbing and dissociating H_(2).The conversion of CO_(2)and the selectivity of CO over Co/ZrO 2@NC-3h 700 catalyst are maintained at 35%and 94%,respectively after 24 h of activity test at 600℃.The selectivity of CO over the catalyst is higher than that over Co/ZrO_(2).