文献类型：期刊文章

作　　者：龙泽荣[1] 胡瑞生[1] 高官俊[1] 牛建中[2] 高玲[2]

机构地区：[1]内蒙古大学化学化工学院稀土材料化学与物理重点实验室,呼和浩特010021 [2]中国科学院兰州化学物理研究所羰基合成与选择氧化国家重点实验室,甘肃兰州730000

出　　处：《分子催化》

基　　金：国家自然科学基金(20163001);内蒙古及内蒙古大学自然科学基金(200408020203);OSSO国家重点实验室资助项目

年　　份：2006

卷　　号：20

期　　号：5

起止页码：464-466

语　　种：中文

收录情况：AJ、BDHX、BDHX2004、CAS、CSCD、CSCD2011_2012、EI、IC、JST、RCCSE、SCOPUS、ZGKJHX、核心刊

摘　　要：A series of catalysts,hexaaluminates LaCexFe1-xAl11O19（x=0,0.2,0.4,0.6,0.8,1） were prepared by the co-precipitation method.The influences of the Ce doped on structure and catalytic performance of catalysts were studied by XRD,FT-IR,H2-TPR,UV-DRS,XPS,EC（Electrical conductivity） and methane combustion activity test.The result shows that rare earth Ce species are more readily to exist in the form of CeO2over the catalysts than to enter the bulks of LaFeAl11O19hexaaluminates to substitute Al and Fe.Compared with catalyst LaFeAl11O19 without Ce doped,the Ce doped catalysts are being higher catalytic activity for methane combustion.Under reaction conditions of 4800h-1air velocity,and LaCe0.8Fe0.2Al11O19 showed the highest activity.It indicated that the CeO2,was contributed to improve the catalytic activity of LaCe0.8Fe0.2Al11O19 .Meanwhile,with Ce-containing increasing,the FT-IR spectra of each sample move forward the direction of higher wave-numbers slightly.Catalysts reduced proceeding becomes difficult.XPS and EC（Electrical conductivity） tests found that charge density of Fe3+ was added and Fe2P3 binding energy shifted to minus direction,electrical conductivity performance revealed that La-Fe hexaaluminates belonged to n-type semiconductor.After doped Ce,we found that electrical conductivity decline.When content of Ce reaches to x=0.8,the sample’s electrical conductivity becomes zero.

关 键 词：稀土催化剂 催化燃烧 六铝酸盐 共沉淀法

分 类 号：O543.32[物理学类]