通过柠檬酸络合树脂法合成了钙钛矿催化剂La_(0.6)Ba_(0.4)Co_(0.2)Fe_(0.8)O_3前驱体,然后分别对前驱体以不同功率和扫描速度的激光扫描及高温焙烧进行处理.用XRD、XPS方法测定了催化剂的结构并测定了催化剂的甲烷燃烧活性.结果表明,适当激光条件下制备的催化剂活性明显高于高温焙烧的催化剂.激光制备催化剂高活性的原因可归因于,激光处理的特点使催化剂形成较小的晶粒度、存在的夹杂相造成晶格缺陷.
Perovskite-type catalysts La_(0.6)Ba_(0.4)Co)_(0.2)Fe_(0.8)O_3 precursers were prepared by so-called "citrate method",and then irradiated by laser and calcinated at 850℃ respectively. Optional conditions for laser irradiation were determined in terms of laser power and scanning velocity.The structures of catalysts were characterized by XRD and XPS techniques,and their activities for methane catalytic combustion were investigated.The experimental results showed that the catalyst prepared by laser with proper laser parameters exhibits much higher activity than that prepared by calcination method.This might be interpreted as the smaller crystal size and larger lattice distortion of catalysts due to the specificity of laser treatment.
参考文献
| [1] | 王觅堂,李梅,柳召刚,胡艳宏.稀土在催化燃烧中的应用研究进展[J].稀土,2007(05):104-108. |
| [2] | Sammes N M;Philipps M B .The systhesis of La_(1-x)Sr_xMnO_3 at different sintering temperatures[J].Journal of Materials Science Letters,1993,12(11):829. |
| [3] | Wang XW.;Zhou SX.;Zhang ZY. .Preparation of nano-crystalline SrTiO3 powder in sol-gel process[J].Materials Science & Engineering, B. Solid-State Materials for Advanced Technology,2001(1):29-33. |
| [4] | 冉锐,吴晓东,翁端.稀土钙钛矿催化剂制备方法的研究进展[J].稀土,2004(05):46-50,57. |
| [5] | 牛建荣;刘伟;訾学红 等.La_(1-x)Sr_xMnO_(3-δ)(x=0,0.4)纳米粒子的制备、表征及催化性能研究[J].中国稀土学报,2005,23(z1):12. |
| [6] | 许延辉,徐海平,马莹,郭文亮,李纯毅.共沉淀-喷雾干燥法合成高比表面积锰酸镧锶的研究[J].稀土,2008(05):17-19. |
| [7] | 胡勇,吴元欣,吴广文,池汝安,杨小俊.柠檬酸络合法微波烧结制备复合氧化物La1-xPbxMnO3[J].稀土,2006(01):50-53. |
| [8] | 丁阳喜,杨柳青,付伟.激光热处理技术的研究现状及发展[J].机械工程师,2006(01):19-21. |
| [9] | 王少辉 .Al_2(WO_4)_3钨酸盐的激光烧结、高温快速合成研究[D].郑州:郑州大学,2007. |
| [10] | 王军威,田志坚,徐金光,徐云鹏,徐竹生,林励吾.甲烷高温燃烧催化剂研究进展[J].化学进展,2003(03):242-248. |
| [11] | 王秋菠;窦伯生;于作龙 .La_(0.2)Ca_(0.8)MnO_3催化剂活性相的结构和形成机理[J].催化学报,1998,19(02):116. |
| [12] | 胡瑞生,阿山,吕宏缨,沈岳年.焙烧温度对稀土钴系复合氧化物催化剂结构与性能的影响[J].分子催化,2002(02):127-130. |
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