Effect of Strontium on Structure and Superficial Area of La2O3
Affiliation(s)
Laboratoire de Matériaux et Catalyse, Département de Chimie, Faculté des Sciences, Université Djillali Liabes, Sidi Bel Abbès, Algérie. Laboratoire de Matériaux, Applications et Environnement, Département des Sciences de la Matière, Faculté des Sciences et de la Technologie, Université de Mascara, Mascara, Algérie. Centre Universitaire d’A?n-Témouchent (CUAT), A?n-Témouchent, Algérie.
Laboratoire de Matériaux et Catalyse, Département de Chimie, Faculté des Sciences, Université Djillali Liabes, Sidi Bel Abbès, Algérie. Laboratoire de Matériaux, Applications et Environnement, Département des Sciences de la Matière, Faculté des Sciences et de la Technologie, Université de Mascara, Mascara, Algérie. Centre Universitaire d’A?n-Témouchent (CUAT), A?n-Témouchent, Algérie.
ABSTRACT
Recently, lanthanum oxide doped by group IIA elements may strongly influence solid state reaction. A series of samples, noted LaSrX (where X = % atomic of strontium) have been prepared by hydrolysis, in neutral medium from La2O3 and SrCO3. These samples were calcined under air at 450?C and 1150?C then characterized by specific surface area (BET), X-ray diffraction, scanning electron microscopy (SEM), thermogravimetry (TG) and differential thermal analysis (DTA). Obtained results show that after calcinations at: 1) 450?C, the addition of strontium is without effect on surface of La2O3 and the XRD analysis revealed no interaction between lanthanum oxide and strontium carbonate; 2) 1150?C, the sintering of the samples is very important, reduction of 70% of surfaces compared to the samples calcined at 450?C; XRD results show that LaSrX are formed principally by two oxides: SrLa2O4 and La2O3, which is confirmed by SEM method. The reaction between La2O3 and SrCO3 showed three endothermic weight losses; elimination of water, a partial dehydroxylation of La(OH)3 and formation of La2O2CO3 and La2(CO3)3.
Recently, lanthanum oxide doped by group IIA elements may strongly influence solid state reaction. A series of samples, noted LaSrX (where X = % atomic of strontium) have been prepared by hydrolysis, in neutral medium from La2O3 and SrCO3. These samples were calcined under air at 450?C and 1150?C then characterized by specific surface area (BET), X-ray diffraction, scanning electron microscopy (SEM), thermogravimetry (TG) and differential thermal analysis (DTA). Obtained results show that after calcinations at: 1) 450?C, the addition of strontium is without effect on surface of La2O3 and the XRD analysis revealed no interaction between lanthanum oxide and strontium carbonate; 2) 1150?C, the sintering of the samples is very important, reduction of 70% of surfaces compared to the samples calcined at 450?C; XRD results show that LaSrX are formed principally by two oxides: SrLa2O4 and La2O3, which is confirmed by SEM method. The reaction between La2O3 and SrCO3 showed three endothermic weight losses; elimination of water, a partial dehydroxylation of La(OH)3 and formation of La2O2CO3 and La2(CO3)3.
Cite this paper
R. Imane Fertout, M. Ghelamallah and S. Kacimi, "Effect of Strontium on Structure and Superficial Area of La2O3," Advances in Materials Physics and Chemistry, Vol. 2 No. 1, 2012, pp. 31-36. doi: 10.4236/ampc.2012.21005.
R. Imane Fertout, M. Ghelamallah and S. Kacimi, "Effect of Strontium on Structure and Superficial Area of La2O3," Advances in Materials Physics and Chemistry, Vol. 2 No. 1, 2012, pp. 31-36. doi: 10.4236/ampc.2012.21005.
References
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[1] M. C. J. Bradford and M. A. Vannice, “CO2 Reforming of CH4,” Catalysis Reviews: Science and Engineering, Vol. 41, No. 1, 1999, pp. 1-42. doi:10.1081/CR-100101948 [2] T. Le Van, C. Louis, M. Kermarec, M. Che and J. M. Tatibou?t, “Temperature and Conversion Dependence of Selectivities in Oxidative Coupling of Methane on La2O3 Catalysts,” Catalysis Today, Vol. 13, No. 2-3, 1992, pp. 321-328. doi:10.1016/0920-5861(92)80156-H [3] A. Trovarelli, C. De Leitenburg and G. Dolcetti, “Design Better Cerium-Based Oxidation Catalysts,” Chemtech, Vol. 27, No. 6, 1997, pp. 32-37. [4] S. J. Huang, A. B. Walters and M. A. Vannice, “NO Reduction with H2 or CO over La2O3 and Sr-Promoted La2O3,” Journal of Catalysis, Vol. 173, No. 1, 1998, pp. 229-237. doi:10.1006/jcat.1997.1911 [5] M. Traykova, N. Davidova, J.-S. Tsaih and A. H. Weiss, “Oxidative Coupling of Methane—The Transition from Reaction to Transport Control over La2O3/MgO Catalyst,” Applied Catalysis A: General, Vol. 169, No. 2, 1998, pp. 237-247. [6] M. Ghelamallah, S. Kacimi and R. I. Fertout, “Incorporation of Barium in Titanium Oxide and Lanthanum Oxide,” Materials Letters, Vol. 59, No. 6, 2005, pp. 714-718. doi:10.1016/j.matlet.2004.06.072 [7] M. D. Mitchell and M. A. Vannice, “Adsorption and Catalytic Behavior of Palladium Dispersed on Rare Earth Oxides,” Industrial and Engineering Chemistry Fundamentals, Vol. 23, No. 1, 1984, pp. 88-96. doi:10.1021/i100013a016 [8] A. Galenda, M. M. Natile, L. Nodari and A. Glisenti, “La0.8Sr0.2Ga0.8Fe0.2O3?δ: Influence of the Preparation Procedure on Reactivity toward Methanol and Ethanol,” Applied Catalysis B: Environmental, Vol. 97, No. 3-4, 2010, pp. 307-322. doi:10.1016/j.apcatb.2010.04.004 [9] T. J. Toops, A. B. Walters and M. A. Vannice, “The Effect of CO2 and H2O on the Kinetics of NO Reduction by CH4 over a La2O3/γ-Al2O3 Catalyst,” Journal of Catalysis, Vol. 214, No. 2, 2003, pp. 292-307. doi:10.1016/S0021-9517(02)00092-1 [10] L. M. Cornaglia, J. Munera, S. Irusta and E. A. Lombardo, “Raman Studies of Rh and Pt on La2O3 Catalysts Used in a Membrane Reactor for Hydrogen Production,” Applied Catalysis A: General, Vol. 263, No. 1, 2004, pp. 91-101. doi:10.1016/j.apcata.2003.12.003 [11] K. Matsuzawa, T. Mizusaki, S. Mitsushima, N. Kamiya and K. Ota, “The Effect of La Oxide Additive on the Solubility of NiO in Molten Carbonates,” Journal of Power Sources, Vol. 140, No. 2, 2005, pp. 258-263. doi:10.1016/j.jpowsour.2004.08.041 [12] T. J. Toops, A. B. Walters, M. A. Vannice “The Effect of CO2 and H2O on the Kinetics of NO Reduction by CH4 over Sr-Promoted La2O3,” Catalysis Letters, Vol. 82, No. 1-2, 2002, pp.45-57. doi:10.1023/A:1020583806660 [13] B. A. A. Balboul, “The Solid State Reaction between Lanthanum Oxide and Strontium Carbonate,” Thermochimica Acta, Vol. 445, No. 1, 2006, pp. 78-81. doi:10.1016/j.tca.2006.03.005 [14] ICDD Diffraction Databases, 1994-1998. International Center for Diffraction Data (CDRom), Newtown Square. [15] R. C Weast, “Handbook of Chemistry and Physics,” 66th Edition, CRC, Boca Raton, 1985-1986, p. B-148.