为研究纳米钙钛矿型稀土氧化物ABOx中A、B组合对NO+ CO催化活性的影响规律及机理,采用柠檬酸溶胶-凝胶法制备了6个钙钛矿型稀土复合氧化物LaMnOx、YMnOx、LaCoOx、YCoOx、LaNiOx、YNiOx,用X射线衍射(XRD)、扫描电镜(SEM)、比表面积(BET)、X射线光电子能谱(XPS)对其进行了表征,测试了它们对CO+NO的催化活性.所得催化剂对CO的催化活性顺序为:LaNiOx＞YCoOx＞YNiOx＞YMnOx＞LaCoOx＞LaMnOx,对NO的催化活性顺序为:LaNiOx＞YCoOx＞YNiOx＞LaCoOx＞YMnOx＞LaMnOx.LaNiOx的催化活性最好,350℃时NO和CO转化率均为100％.结果表明,B位Mn、Co、Ni离子的价态和外层d电子数、催化剂的比表面积及其氧的存在形式是影响催化活性的重要因素.而价态相同、半径不同的La3+或Y3+通过对晶格氧和B位Mn、Co、Ni价态的影响,从而对催化活性也有较大的影响.
参考文献
| [1] | 白屏,黄荣光,卢军,贺小昆,桓源峰.稀土钙钛矿型复合氧化物在汽车尾气催化转化器中的作用[J].贵金属,2004(01):67-70. |
| [2] | 张爱敏,宁平,黄荣光,贺小昆,赵云昆,顾永万,桓源峰,杨冬霞.汽车尾气净化用贵金属催化材料研究进展[J].贵金属,2005(03):66-70,50. |
| [3] | 赵文怡,许延辉,孟志军,刘海娇,张旭霞.负载型LaCoO3/γ-Al2O3催化剂的制备及性能的研究[J].稀土,2013(03):93-97. |
| [4] | V.C. Belessi;T.V. Bakas;C.N. Costa;A.M. Efstathiou;P.J. Pomonis .Synergistic effects of crystal phases and mixed valences in La-Sr-Ce-Fe-O mixed oxidic/perovskitic solids on their catalytic activity for the NO+CO reaction[J].Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications,2000(1):13-28. |
| [5] | 郭文亮,柳召刚,王东杰,许延辉,刘海蛟.制备工艺对LaMnO3钙钛矿型催化剂性能影响的研究[J].稀土,2012(04):38-43. |
| [6] | 刘铃声,许延辉,熊晓柏,曹鸿璋,孟志军,王英杰.稀土纳米材料的研究进展[J].稀土,2012(06):84-89. |
| [7] | 李光灿,王枝梅,施川,康赢利,余旦,余高奇.LaCoO3超细粒子的模板法制备及光催化性能研究[J].稀土,2013(04):35-40. |
| [8] | Zhaoqiang Li;Ming Meng;Fangfang Dai;Tiandou Hu;Yaning Xie;Jing Zhang.Performance of K and Ni substituted La_(1-x)K_xCo_(1-y)Ni_yO_(3-δ) perovskite catalysts used for soot combustion, NO_X storage and simultaneous NO_x-soot removal[J].Fuel,2012:606-610. |
| [9] | 刘磊,王丽,陈剑飞,张瑞丰.大孔SiO2载体制备La0.8Sr0.2CoO3及其对NO+CO的催化性能[J].工业催化,2011(03):29-34. |
| [10] | Teraoka Y.;Kagawa S.;Jansson K.;Nygren M.;Nii H. .Influence of the simultaneous substitution of Cu and Ru in the perovskite-type (La,Sr)MO3 (M=Al, Mn, Fe, Co) on the catalytic activity for CO oxidation and CO-NO reactions[J].Applied Catalysis, A. General: An International Journal Devoted to Catalytic Science and Its Applications,2000(Special Issue SI):35-41. |
| [11] | B. Levasseur;S. Kaliaguine .Effects of iron and cerium in La_(1-y)Ce_yCo_(1-x)Fe_xO_3 perovskites as catalysts for VOC oxidation[J].Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications,2009(3/4):305-314. |
| [12] | R.K.C. de Lima;M.S. Batista;M. Wallau .High specific surface area LaFeCo perovskites-Synthesis by nanocasting and catalytic behavior in the reduction of NO with CO[J].Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications,2009(3/4):441-450. |
| [13] | Bahman Seyfi;Morteza Baghalha;Hossein Kazemian .Modified LaCoO3 nano-perovskite catalysts for the environmental application of automotive CO oxidation[J].Chemical engineering journal,2009(2/3):306-311. |
| [14] | 程素,王丽,刘磊.纳米La0.8A'0.2Mn1-xCuxO3（A'=Ce and/or Sr）的制备、表征及其高效催化NO+CO的性能研究[J].中国稀土学报,2012(01):34-40. |
| [15] | A.A.Leontiou;A.K.Ladavos;G.S.Armatas;P.N.Trikalitis;P.J.Pomonis .Kinetics investigation of NO+CO reaction on La-Sr-Mn-O perovskite-type mixed oxides[J].Applied Catalysis, A. General: An International Journal Devoted to Catalytic Science and Its Applications,2004(2):227-239. |
| [16] | Hong He;Mei Liu;Hongxing Dai .An investigation of NO/CO reaction over perovskite-type oxide La_(0.8)Ce_(0.2)B_(0.4)Mn_(0.6)O3(B=Cu or Ag)catalysts synthesized by reverse microemulsion[J].Catalysis Today,2007(3/4):290-295. |
| [17] | 张桂荣,刘建,张丽,金永军.稀土锰氧化物LaMn1-xZnxO3的XRD和XPS研究[J].内蒙古大学学报（自然科学版）,2012(03):273-277. |
| [18] | Xiaosheng Peng;He Lin;Wenfeng Shangguan .A highly efficient and porous catalyst for simultaneous removal of NOx and diesel soot[J].Catalysis Communications,2007(26):157-161. |
| [19] | 江凌,王贵昌*,吴杨,郭俊怀,赵学庄,黄伟,庞先勇,曾凡桂.CO在过渡金属表面上的吸附活化[J].化学通报（网络版）,2003(1) |
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