铈镁修饰的镍基催化剂对CO2-CH4重整反应稳定性的影响  

Effect of Ni-based Catalyst Modified by Ce and Mg on Stability of CO_2-CH_4 Reforming Reaction

作　　者：刘建周[1] 陈清如[1] 高利平[1] 刘凤丽[2] 李沙沙[1] 许红娟[1] 江晶亮[1] 

机构地区：[1]中国矿业大学化工学院,江苏徐州221116 [2]西华大学数学与计算机学院,四川成都610039

出　　处：《中国矿业大学学报》2008年第5期641-645,共5页Journal of China University of Mining & Technology

基　　金：教育部科学技术研究重点项目(104031);中国矿业大学科技基金项目(2007B010)资助

摘　　要：采用溶胶-凝胶法制备纳米γ-Al2O3载体,浸渍法负载催化剂组分氧化镍(NiO),氧化铈(CeO2)或氧化镁(MgO).750℃的反应温度下在微型固定床反应器中测试催化剂的CO2/CH4重整反应性能.XRD,TG,SEM和TEM表征催化剂失活前后的结构和积碳形貌.结果表明,助剂CeO2有利于提高NiO催化剂的反应稳定性,而助剂MgO却使催化剂的稳定性下降.催化剂上活性组分的存在形态为NiO,催化剂完全失活后NiO消失,而以NiC存在.助剂CeO2延缓了NiO转为NiC的速度,明显提高了催化剂的抗积碳性能和反应稳定性.积碳失活后的催化剂可以通过烧碳再生.The support was made of γ-Al2O3nanoparticles prepared by a sol-gel method, and NiO, CeO2 or MgO were loaded on the support by an impregnation method. The activity and stability of catalysts for CO2-CH4 reforming reaction were tested in a fixed bed microreactor at 750 ℃. The microstructure of the catalysts was characterized by XRD, and the morphology observation of the carbon deposited on the catalysts was characterized by TG, SEM and TEM. The results show that the stability of the catalyst NiO/Al2O3 loaded with promoter CeO2 was improved, and loaded with promoter MgO weakened. NiO is the activity species of the catalysts. The catalytic activity of the catalysts disappeared after NiO changing into NiC. This process can be hindered by CeO2 loaded on the support, which can obviously improve the cata-lytic stability of the catalysts and decrease the deposit of carbon on the catalyst. The deactiva- ted catalysts can be recovered when the carbon deposited on the catalysts was oxidized.

关 键 词：重整反应 催化剂 助剂 

分 类 号：TQ032[化学工程]