| 龙泽荣,胡瑞生,高官俊,牛建中,高玲.稀土铈掺杂对甲烷高温燃烧催化剂LaFeAl11O19结构和性能的影响[J].分子催化,2006,(5):464-466 |
| 稀土铈掺杂对甲烷高温燃烧催化剂LaFeAl11O19结构和性能的影响 |
| Effect of Ce Doped on Structure and Performance of LaFeAl11O19 Catalyst for Methane High-temperature Combustion |
| 投稿时间：2005-10-04 |
| DOI： |
| 中文关键词: 稀土催化剂,催化燃烧,六铝酸盐,共沉淀法 |
| 英文关键词:Rare earth catalyst,Catalytic combustion,Hexaaluminates,co-Precipitation method |
| 基金项目:国家自然科学基金;内蒙古及内蒙古大学校科研和教改项目;国家重点实验室基金 |
| 龙泽荣 胡瑞生 高官俊 牛建中 高玲 |
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(龙泽荣，胡瑞生，高官俊)
，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(牛建中，高玲)
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| 中文摘要: |
| 六铝酸盐甲烷高温燃烧催化剂研究目前主要集中在BaMnA l11O19基和LaMnA l11O19基的催化剂上[1-4],关于LaFeA l11O19催化剂研究相对较少,而据文献报道[5]在沉淀法制备取代型的六铝酸钡催化剂中铁和锰活性相近,但铁比锰具有更高的耐高温和抗水热冲击的能力,因此本工作选择LaFeA l |
| 英文摘要: |
| A series of catalysts,hexaaluminates LaCe_(x)Fe_(1-x)Al_(11)O_(19)(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 CeO_(2)over the catalysts than to enter the bulks of LaFeAl_(11)O_(19)hexaaluminates to substitute Al and Fe.Compared with catalyst LaFeAl_(11)O_(19) without Ce doped,the Ce doped catalysts are being higher catalytic activity for methane combustion.Under reaction conditions of 4800h~(-1)air velocity,and LaCe_(0.8)Fe_(0.2)Al_(11)O_(19) showed the highest activity.It indicated that the CeO_(2),was contributed to improve the catalytic activity of LaCe_(0.8)Fe_(0.2)Al_(11)O_(19) .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 Fe~(3 ) 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. |
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