Stoichiometric LaMnO3 and LaCoO3 nanoparticles were synthesized via calcination of a dried solution, containing molar ratio of La(NO3)3·6H2O/[Mn(NO3)2·4H2O or Co(NO3)2·6H2O]=1 and citric acid as disperser at temperature range of 600-900 oC for 5 h. The role of organic additive concentration, which was 0.0, 1.0, 2.5 and 5 times of the total number of moles of the nitrate ions, was investigated on phase formation, morphology, extent of crystallization and particle size of the products. Products were characterized by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and transmission elec-tron microscopy (TEM) analysis. The tendency of lanthanum ion toward manganese cation was observed to be more than to cobalt cation for the formation of LaBO3 (B:Mn or Co) perovskite phase. A spongy product was formed on perovskite phase formation or in the pres-ence of citric acid. A constructive or destructive effect was observed for the organic disperser on perovskite phase formation, which de-pended on mole of the citric acid.
参考文献
| [1] | Pena M A;Fierro J L G .Chemical structures and perform-ance of perovskite oxides[J].Chemical Reviews,2001,101:1981. |
| [2] | Gao P;Li N;Wang A Q;Wang X D, Zhang T .Perovskite LaMnO3 hollow nanospheres:The synthesis and the ap-plication in catalytic wet air oxidation of phenol[J].Materials Letters,2013,92:173. |
| [3] | JIA Meilin,LI Xu,Zhaorigetu,SHEN Yuenian,LI Yunxia.Activity and deactivation behavior of Au/LaMnO3 catalysts for CO oxidation[J].稀土学报（英文版）,2011(03):213-216. |
| [4] | Zhang C H;Wang C;Zhan W C;Guo Y L, Guo Y, Lu G Z, Baylet A, Giroir-Fendler A .Catalytic oxidation of vinyl chloride emission over LaMnO3 and LaB0 2Mn0.8O3 (B=Co, Ni, Fe) catalysts[J].Appl Catal B:Environ,2013,129:509. |
| [5] | Maghsoodi S;Towfighi J;Khodadadi A;Mortazavi Y .The effects of excess manganese in nano-size lanthanum man-ganite perovskite on enhancement of trichloroethylene oxidation activity[J].Chemica1 Engineering Journal,2013,215-216:827. |
| [6] | Shen M Q;Zhao Z;Chen J H;Su Y G, Wang J, Wang X Q .Effects of calcium substitute in LaMnO3 perovskites for NO catalytic oxidation[J].Journal of Rare Earths,2013,31:119. |
| [7] | Abadian;Layla;Malekzadeh;Azim;Khodadadi;Abbas Ali;Mortazavi Yadollah .Effects of Excess Cobalt Oxide Nanocrystallites on LaCoO_3 Catalyst on Lowering the Light off Temperature of CO and Hydrocarbons Oxidation[J].Iranian Journal of Chemistry and Chemical Engineering,2008(4):71-77. |
| [8] | Khazaei, M.;Malekzadeh, A.;Amini, F.;Mortazavi, Y.;Khodadadi, A. .Effect of citric acid concentration as emulsifier on perovskite phase formation of nano-sized SrMnO_3 and SrCoO_3 samples[J].Crystal Research and Technology: Journal of Experimental and Industrial Crystallography,2010(10):1064-1068. |
| [9] | Esmaeilnejad-Ahranjani P;Khodadadi A;Ziaei-Azad H;Mortazavi Y .Effects of excess manganese in lanthanum manganite perovskite on lowering oxidation light-off tem-perature for automotive exhaust gas pollutants[J].Chemica1 Engineering Journal,2011,169:282. |
| [10] | Villoria J A;Alvarez-Galvan M C;Al-Zahrani S M;Palmisano P, Specchia S, Specchia V, Fierro J L G, Navarro R M .Oxidative reforming of diesel fuel over La-CoO3 perovskite derived catalysts:Influence of perovskite synthesis method on catalyst properties and performance[J].Appl Catal B:Environ,2011,105:276. |
| [11] | Kasapoglu N;Baykal A;Koseoglu Y;Toprak M S .Microwave-assisted combustion synthesis of CoFe2O4 with urea, and its magnetic characterization[J].Scripta Ma-ter,2007,57:441. |
| [12] | Chen W F;Li F S;Liu L L;Liu Y .One-step synthesis of nanocrytalline perovskite LaMnO3 powders via micro-wave-induced solution combustion route[J].Journal of Rare Earths,2006,24:782. |
| [13] | Courty P;Ajot H;Marcilly C;Delmon B .Oxydes mixtes ou en solution solide sous forme très divisée obtenus par décomposition thermique de précurseurs amorphes[J].Pow-der Technol,1973,7:21. |
| [14] | Zhang H M;Teraoka Y;Yamazoe N .Preparation of perovskite-type oxides with large surface area by citrate process[J].Chemistry Letters,1987,16:665. |
| [15] | Akhmetkhanov R M;Kolesov S V;Kadyrov R G;Yu Karmilov A, Zaikov G E .Preparation of metal carboxylates and their stabilizing performance under intense high-pres-sure shear treatment[J].RUSSIAN JOURNAL OF APPLIED CHEMISTRY,2004,77:842. |
| [16] | Rida1 K;Pena M A;Sastre E;Martnez-Arias A .Effect of calcination temperature on structural properties and catalytic activity in oxidation reactions of LaNiO3 perovskite pre-pared by Pechini method[J].Journal of Rare Earths,2012,30:210. |
| [17] | Han Y F;Chen F;Zhong Z Y;Ramesh K, Widjaja E, Chen L W .Synthesis and characterization of Mn3O4 and Mn2O3 nanocrystals on SBA-15:Novel combustion catalysts at low reaction temperatures[J].Catalysis Communications,2006,7:739. |
| [18] | Arena F.;Raimondo C.;Parmaliana A.;Torre T. .Structure and redox properties of bulk and supported manganese oxide catalysts[J].Physical chemistry chemical physics: PCCP,2001(10):1911-1917. |
| [19] | Pecchi G;Campos C;Pena O .Thermal stability against reduction of LaMn1-yCoyO3 perovskites[J].Materials Research Bulletin,2009,44:846. |
| [20] | Valange S;Beauchaud A;Barrault J;Gabelica Z, Daturi M, Can F .Lanthanum oxides for the selective synthesis of phytosterol esters:Correlation between catalytic and acid-base properties[J].Journal of Catalysis,2007,251:113. |
| [21] | Salavati-Niasari M;Hosseinzadeha G;Davar F .Synthesis of lanthanum carbonate nanoparticles via sonochemical method for preparation of lanthanum hydroxide and lantha-num oxide nanoparticles[J].Journal of Alloys and Compounds,2011,509:134. |
| [22] | Sertkol, M;Koseoglu, Y;Baykal, A;Kavas, H;Toprak, MS .Synthesis and magnetic characterization of Zn0.7Ni0.3Fe2O4 nanoparticles via microwave-assisted combustion route[J].Journal of Magnetism and Magnetic Materials,2010(7):866-871. |
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