掺杂氧化物对Ni-ZrO_2-Al_2O_3催化剂的性能影响  

The Effect of the Oxide Doping on the Property of Ni-ZrO_2-Al_2O_3 Catalyst

作　　者：陈俭省[1] 李凝[1] 刘金聚[1] 

机构地区：[1]桂林理工大学材料与化学工程系,广西桂林541004

出　　处：《广西科学》2010年第1期75-79,共5页Guangxi Sciences

基　　金：广西科学基金项目(桂科自0728217);广西科学研究与技术开发计划项目(桂科能0842003)资助

摘　　要：用水热合成法分别制备Ni-ZrO2-Al2O3和Ni-MxOy-ZrO2-Al2O3催化剂,并用XRD、H2-TPR、H2-TPD和CO2-TPD方法对对催化剂的晶相结构、活性中心、表面酸碱性等进行表征,同时以CO2重整CH4反应为探针考察催化剂的活性及稳定性。结果表明,在Ni-ZrO2-Al2O3催化剂中掺杂不同的金属氧化物MxOy能改变催化剂的晶相结构,对催化剂表面活性和碱性中心有一定程度的调控作用。掺杂BaO、CeO2和K2O后的催化剂反应的初活性明显增加,在850℃时,使CH4的转化率分别达到92.31%、90.29%和90.06%,CO2的转化率分别达到94.37%、93.94%和93.22%。800℃条件下反应100h后,Ni-BaO-ZrO2-Al2O3催化剂上的CH4转化率基本上维持在85%。Hydrothermal method was applied to prepare Ni-ZrO2-Al2O3 and Ni-MxOy-ZrO2-Al2O3.Crystalline structures,active centers and alkalinity of the catalysts were characterized by XRD,H2-TPR,H2-TPD and CO2-TPD.The CO2 reforming of CH4 reaction was chosen to investigate the catalytic activity and stability of the catalysts.The results show that the phase of every ingredient in the catalysts which was prepared by hydrothermal method is singleness.The results of the activity of catalytic show that the activity of Ni-BaO-ZrO2-Al2O3,Ni-CeO2-ZrO2-Al2O3 and Ni-K2O-ZrO2-Al2O3 in the beginning of the reaction was better than others at 850℃,CH4 conversion rate was reached 92.31%,90.29% and 90.06% respectively,and CO2 conversion rate was reached 94.37%,93.94% and 93.22%.The results of the stability of catalytic show that the Ni-BaO-ZrO2-Al2O3 catalyst displays higher stability than others for CO2 reforming of CH4∶CH4 conversion rate was maintained 85% after reacted 100h at 800℃.

关 键 词：掺杂氧化物 二氧化碳 甲烷 重整 

分 类 号：O484[理学—固体物理]