The influence of La2O3-doping on structural, surface and catalytic properties of nano-sized cobalt-manganese mixed oxides

被引：4
作者：
Badawy, Abdelrahman A. [1 ]
Ibrahim, Shaimaa M. [2 ,3 ]
机构：
[1] Natl Res Ctr, Dept Phys Chem, Cairo, Egypt
[2] Ain Shams Univ, Fac Educ, Dept Chem, Cairo, Egypt
[3] Qassim Univ, Fac Sci, Dept Chem, Buraydah, Saudi Arabia
来源：
INTERNATIONAL JOURNAL OF INDUSTRIAL CHEMISTRY | 2016年 / 7卷 / 03期
关键词：
Cobalt manganite; La2O3-dopant; Coprecipitation; Catalytic decomposition of H2O2;
D O I：
10.1007/s40090-015-0068-2
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Structural, textural and catalytic activity of CoO-Mn2O3 system as being influenced by La2O3-doping (0.75-3 mol%) and calcination temperatures (300-500 degrees C) were investigated. The techniques employed were XRD, N-2-adsorption-desoprtion at -196 degrees C, EDX and catalysis of H2O2-decomposition in aqueous solution at 30-50 degrees C. The results revealed that the investigated system consisted of nano-sized Co2MnO4 as a major phase together with un-reacted portion of Co3O4 and gamma-Mn3O4. Doping with the smallest amount of La2O3 greatly increased the surface molar ratio of Mn/Co (88 %) for the solid calcined at 500 degrees C with subsequent increase of the catalytic activity more than 12-fold for solids calcined at 500 degrees C. The increase of La2O3-dopant above 0.75 mol% decreased progressively the surface molar ratio of Mn/Co with subsequent decrease in the catalytic activity which still measured higher values than that measured for the un-doped catalyst.
引用
收藏
页码：287 / 296
页数：10
相关论文
共 35 条
[1]   SURFACE-STRUCTURE AND THE INSTABILITY OF THE FORMATE OVERLAYER AT A PB(110) SURFACE [J].
AFSIN, B ;
ROBERTS, MW .
CATALYSIS LETTERS, 1992, 13 (03) :277-282
[2]   Alumina-supported manganese- and manganese-palladium oxide catalysts for VOCs combustion [J].
Alvarez-Galván, MC ;
O'Shea, VADP ;
Fierro, JLG ;
Arias, PL .
CATALYSIS COMMUNICATIONS, 2003, 4 (05) :223-228
[3]   Characterization of manganese and iron oxides as combustion catalysts for propane and propene [J].
Baldi, M ;
Escribano, VS ;
Amores, JMG ;
Milella, F ;
Busca, G .
APPLIED CATALYSIS B-ENVIRONMENTAL, 1998, 17 (03) :L175-L182
[4]   Characterization of nanocrystalline manganese oxide powder prepared by inert gas condensation [J].
Chen, Chin-Yi ;
Lin, Chung-Kwei ;
Tsai, Ming-Hsiu ;
Tsay, Chien-Yie ;
Lee, Pee-Yew ;
Chen, Giin-Shan .
CERAMICS INTERNATIONAL, 2008, 34 (07) :1661-1666
[5]   Catalytic activity of Co-Mg-Al, Cu-Mg-Al and Cu-Co-Mg-Al mixed oxides derived from hydrotalcites in SCR of NO with ammonia [J].
Chmielarz, L ;
Kustrowski, P ;
Rafalska-Lasocha, A ;
Majda, D ;
Dziembaj, R .
APPLIED CATALYSIS B-ENVIRONMENTAL, 2002, 35 (03) :195-210
[6]   Synthesis of nanocrystalline Mn-oxides by gas condensation [J].
Dimesso, L ;
Heider, L ;
Hahn, H .
SOLID STATE IONICS, 1999, 123 (1-4) :39-46
[7]   Structural and electrical properties of γ-irradiated TiO2/Al2O3 composite prepared by sol-gel method [J].
El All, S. Abd ;
El-Shobaky, Gamil Ali .
JOURNAL OF ALLOYS AND COMPOUNDS, 2009, 479 (1-2) :91-96
[8]   Physicochemical, surface and catalytic properties of nanosized copper and manganese oxides supported on cordierite [J].
El-Shobaky, G. A. ;
El-Shobaky, H. G. ;
Badawy, Abdelrahman A. A. ;
Fahmy, Y. M. .
APPLIED CATALYSIS A-GENERAL, 2011, 409 :234-238
[9]   Physicochemical, surface and catalyic properties of nanocrystalline CuO-NiO system as being influenced by doping with La2O3 [J].
El-Shobaky, G. A. ;
Radwan, Nagi R. E. ;
El-Shall, M. Samy ;
Turky, A. M. ;
Hassan, Hassan M. A. .
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, 2009, 345 (1-3) :147-154
[10]  
El-Shobaky G. A., 2009, OPEN CATAL J, V2, P45
1234