Supported La_1--xCe_xMnO₃ perovskite catalysts: preparation, characterization and catalytic performance in methane combustion

Abstract

A serials of La_1--xCe_xMnO₃ (x = 0, 0.2, 0.4, 0.6 and 0.8) catalysts have been prepared via a sol--gel process using citric acid as a chelating agent. The phase composition and morphology of the catalysts are characterized by XRD, SEM and TEM. La_1--xCe_xMnO₃/γ-Al₂O₃/cordierite catalyst has also been prepared by immersion process using cordierite honeycomb ceramic as carrier and γ-Al₂O₃ as support agents. The effect of Ce-doping on the structure of perovskite and catalytic property of methane combustion is explored. The results show that with the increase of Ce substitution, the crystal structure of perovskite changes from the tetragonal system to the orthorhombic system and when the x is equal to 0.2, the catalytic property in methane combustion is the best.

Keywords

perovskite / preparation / sol--gel / methane combustion

References

[1] Fino D, Russo N, Saracco G, . Supported Pd-perovskite catalyst for CNG engines’ exhaust gas treatment. Progress in Solid State Chemistry , 2007, 35(2-4): 501–511
[2] Klingstedt F, Neyestanaki A, Byggningsbacka R, . Palladium based catalysts for exhaust aftertreatment of natural gas powered vehicles and biofuel combustion. Applied Catalysis A , 2001, 209(1-2): 301–316
[3] Ryu C K, Ryoo M W, Ryu I S, . Catalytic combustion of methane over supported bimetallic Pd catalysts: Effects of Ru or Rh addition. Catalysis Today , 1999, 47(1-4): 141–147
[4] Yue B H, Zhou R X, Sha F, . Methane combustion and TPR/TPO properties of Pd/Ce_xZr_1-xO₂/Al₂O₃ catalysts. Journal of the Chinese Rare Earth Society , 2006, 24(1): 22–26 (in Chinese)
[5] Ciambelli P, Palma V, Tikhov S F, . Catalytic activity of powder and monolith perovskites in methane combustion. Catalysis Today , 1999, 47(1-4): 199–207
[6] Li J H, Fu H J, Fu L X, . Complete combustion of methane over indium tin oxides catalysts. Environmental Science & Technology , 2006, 40(20): 6455–6459
[7] Jang B W-L, Nelson R M, Spivey J J, . Catalytic oxidation of methane over hexaaluminates and hexaaluminate-supported Pd catalysts. Catalysis Today , 1999, 47(1-4): 103–113
[8] Ziaei-Azad H, Khodadadi A, Esmaeilnejad-Ahranjani P, . Effects of Pd on enhancement of oxidation activity of LaBO₃ (B= Mn, Fe, Co and Ni) perovskite catalysts for pollution abatement from natural gas fueled vehicles. Applied Catalysis B: Environmental , 2011, 102(1-2): 62–70
[9] Mowery D L, Graboski M S, Ohno T R, . Deactivation of PdO-Al₂O₃ oxidation catalyst in lean-burn natural gas engine exhaust: aged catalyst characterization and studies of poisoning by H₂O and SO₂. Applied Catalysis B: Environmental , 1999, 21(3): 157–169
[10] Lampert J K, Shahjahan Kazi M, Farrauto R J. Palladium catalyst performance for methane emissions abatement from lean burn natural gas vehicles. Applied Catalysis B: Environmental , 1997, 14(3-4): 211–223
[11] Civera A, Pavese M, Saracco G, . Combustion synthesis of perovskite-type catalysts for natural gas combustion. Catalysis Today , 2003, 83(1-4): 199–211
[12] Pe?a M A, Fierro J L. Chemical structures and performance of perovskite oxides. Chemical Reviews , 2001, 101(7): 1981–2018
[13] Qilong Y, Mingna Q, Zhenwei S, . Advance on application of perovskite composite oxides catalysts. Industrial Catalysis , 2011, 19(5): 8–17
[14] Wei X, Hug P, Figi R, . Catalytic combustion of methane on nano-structured perovskite-type oxides fabricated by ultrasonic spray combustion. Applied Catalysis B: Environmental , 2010, 94(1-2): 27–37
[15] Alifanti M, Kirchnerova J, Delmon B. Effect of substitution by cerium on the activity of LaMnO₃ perovskite in methane combustion. Applied Catalysis A: General , 2003, 245(2): 231–244
[16] Sun Y, Hla S S, Duffy G J, . Effect of Ce on the structural features and catalytic properties of La_(0.9-x)Ce_xFeO₃ perovskite-like catalysts for the high temperature water-gas shift reaction. International Journal of Hydrogen Energy , 2011, 36(1): 79–86
[17] Moser W R, ed. Catalytic Chemistry of Solid-State Inorganics. New York: Academy of Sciences, 1976
[18] Goldschmidt V M, Viedenk-Akad S N. Kl. I: Mater.-.Naturvidensk. Kl , 1926, 8: 2
[19] An Q, Feng C G, Zeng Q X, . Progress in the research ceramic honeycomb carrier coating. Chemistry , 2001, 64(3): 135–140 (in Chinese)
[20] Liang Z C, Qin Y N, Liao Q L, . Properties of perovskite-type La_1-xCu_xMnO₃ catalysts. Chinese Journal of Applied Chemistry , 1997, 14(1): 11–15 (in Chinese)