采用溶胶凝胶法制备了一系列La1-x KxNi1-y MyO3(M=Cu,Co,Mn)钙钛矿复合氧化物催化剂,并利用O2-TPO测试该系列催化剂催化氧化碳烟的性能.通过XRD、H2-TPR、XPS对其进行了表征,结果表明,所制备催化剂均为六方晶系钙钛矿结构.着重考察了A位K掺杂量和B位掺杂元素及其掺杂量对催化碳烟性能的影响.结果表明:当K掺杂量x=0.3时,产生更多氧空位,增加了表面吸附氧数量,同时提高了B位Ni的价态;B位Cu掺杂量y=0.1时,表面吸附氧数量增加,Ni3+含量增大,从而提高了催化剂的活性.La0.7 K0.3 Ni0.9 Cu0.1 O3催化剂与碳烟紧密接触下,Ti、Tm分别为268.1℃和272.8℃.
A series of La1-x Kx Ni1-y My O3 (M=Cu,Co,Mn)perovskite catalysts were synthesized by sol-gel method.The prepared catalysts were characterized by XRD,H2-TPR,XPS and the catalytic activity of the catalysts was evaluated by O2-TPO.The XRD results showed that all the catalysts were hexagonal system perovskite structure. The effects of the degree of K substitution of A site and the B site doping element and its amount on the catalytic pro-perties for soot combustion were investigated.The results showed when K doping amount x=0.3 and M=Cu,y=0.1,more adsorption oxygen existed on the surface,indicating the presence of more oxygen vacancies in the catalyst. Moreover,La,Ni partly replaced by K,Cu,respectively,could adjust the Ni valence state in the sample.Under inti-mate contact condition the Ti and Tm of La0.7 K0.3 Ni0.9 Cu0.1 O3 catalyst were 268.1 ℃ and 272.8 ℃,respectively.
参考文献
| [1] | 梁鹏;张桂臻;王季秋;刘坚;赵震.柴油车尾气碳烟颗粒物催化燃烧催化剂的最新研究进展[J].环境工程学报,2008(5):577-585. |
| [2] | 吕刚;霍晓飞;宋崇林;张清茂;吴少华.La1-xCexMnO3催化剂及其催化碳烟氧化活性研究[J].工程热物理学报,2013(9):1762-1766. |
| [3] | 王虹;赵震;徐春明;段爱军;刘坚;迟姚玲.LaBO3钙钛矿型复合氧化物同时消除柴油机尾气炭颗粒和NO[J].催化学报,2008(7):649-654. |
| [4] | Hong Wang;Jian Liu;Zhen Zhao.Comparative study of nanometric Co-, Mn- and Fe-based perovskite-type complex oxide catalysts for the simultaneous elimination of soot and NO_x from diesel engine exhaust[J].Catalysis Today,20121(1):288-300. |
| [5] | Guiotto, Matteo;Pacella, Michael;Perin, Giovanni;Iovino, Alessandro;Michelon, Nicola;Natile, Marta Maria;Glisenti, Antonella;Canu, Paolo.Washcoating vs. direct synthesis of LaCoO3 on monoliths for environmental applications[J].Applied Catalysis, A. General: An International Journal Devoted to Catalytic Science and Its Applications,2015:146-157. |
| [6] | 蔡佳;姚青荣;饶光辉.钴基钙钛矿氧化物La1-xNaxCoO3结构和吸波性能研究[J].中国稀土学报,2015(3):341-348. |
| [7] | Eunho Lim;Young Jin Kim;Ji Ho Kim;Taekyung Ryu;Sumin Lee;Byong K. Cho;In-Sik Nam;Jin Woo Choung;Seungbeom Yoo;Dal Young Yoon.NO oxidation activity of Ag-doped perovskite catalysts[J].Journal of Catalysis,2014:182-193. |
| [8] | Peng XS;Lin H;Shangguan WF;Huang Z.Physicochemical and catalytic properties of La0.8K0.2CuxMn1-xO3 for simultaneous removal of NOx and soot: Effect of Cu substitution amount and calcination temperature[J].Industrial & Engineering Chemistry Research,200626(26):8822-8828. |
| [9] | Liu J;Zhao Z;Xu CM;Duan AJ.Simultaneous removal of NOx and diesel soot over nanometer Ln-Na-Cu-O perovskite-like complex oxide catalysts[J].Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications,20081/2(1/2):61-72. |
| [10] | Alireza Jahangiri;Hamidreza Aghabozorg;Hassan Pahlavanzadeh.Effects of Fe substitutions by Ni in La-Ni-O perovskite-type oxides in reforming of methane with CO_2 and O_2[J].International journal of hydrogen energy,201325(25):10407-10416. |
| [11] | 郭家秀;梁娟;楚英豪;尹华强;陈耀强.Ni物种形态对Ni/AC催化剂低温脱硫性能的影响[J].催化学报,2010(3):278-282. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%