ZrO_2修饰的CuO/Fe_2O_3水煤气变换催化剂的性能测试与表征  

Catalytic performance and characterization of ZrO_2-modified CuO/Fe_2O_3 catalysts in water-gas shift reaction

作　　者：范言语 马骏驰[1] 殷玲[1] 林性贻[1] 

机构地区：[1]福州大学化肥催化剂国家工程研究中心,福建福州350002

出　　处：《工业催化》2016年第1期34-40,共7页Industrial Catalysis

基　　金：国家自然科学基金(21346007)资助项目

摘　　要：ZrO2是-种高熔点金属氧化物，同时具有弱酸性和弱碱性以及氧化性与还原性，具有P型半导体性质，易产生氧空穴，是理想的催化材料。通过添加不同质量分数的ZrO2（0—5％）作为助剂，采用分步沉淀法制备系列CuO／Fe2O2-ZrO2催化剂，通过XRD、N2物理吸附-脱附、H2-TPR和CO2-TPD等表征技术，考察ZrO：助剂对CuO／Fe2O4水煤气变换催化剂催化性能的影响。结果表明，适量ZrO2（质量分数1％）的添加，削弱了CuFe2O4中铜铁物种之间的协同作用，增加了催化剂中可被还原的铜物种的数量，形成较多的弱碱性位点，有利于增加活性中心铜的数量，具有较好的水煤气变换反应活性和热稳定性。ZrO2 is an ideal catalyst material owing to its peculiar characteristics, such as high melting point,weak acidity and basicity,redox properties,with p-type semiconductor properties and easy to produce oxygen hole. CuO/Fe2O3 catalysts modified with different loadings of ZrO2 （0- 5wt% ） were prepared by the stepwise precipitation method. The as-prepared catalysts were characterized by X-ray diffraction, N2 physical adsorption-desorption, H2 temperature-programmed reduction, and CO2 temperature-programmed desorption. The effects of ZrO2 on the catalytic performance of CuO/Fe2O3 catalysts for water-gas shift reaction were investigated. The results showed that moderate ZrO2 （ lwt% ） weakened a synergistic inter- action between the copper and iron species in CuFe2O4 ,leading to the increase of reducible copper spe- cies of CuO/Fe2O3 catalysts, and the formation of more weak alkaline site that was beneficial to the increase of active sites of copper, so CuO/Fe2O3 catalyst with lwt% ZrO2 possessed higher activity and better thermal stability in water gas shift reaction.

关 键 词：催化化学 ZrO2改性 CuO/Fe2O3催化剂 水煤气变换反应 分步沉淀法 

分 类 号：O643.36[理学—物理化学] TQ426.94[理学—化学]