The Study on the Reaction Order and Kinetics of Total Oxidation Reaction of m-xylene over LaMnO3 Perovskite Catalyst

M-xylene, one of the popular toxic pollutants in exhaust gases, is emitted into the environment from factories and engines. The best solution for removing m-xylene to protect the environment is completely transforming it into CO2 and H2O by catalysts. Perovskite of LaMnO3 is one of the catalysts that was synthesized and studied for its catalytic properties in a total oxidation reaction of m-xylene in a previous report by the authors. The results showed that the LaMnO3 perovskite had good catalytic characterizations such as large surface area and big amount of α-oxygen adsorbed on the catalyst; more specifically, LaMnO3 perovskite exhibited a good catalytic activity in a total oxidation of m-xylene at a relatively low reaction temperature. This study determines the reaction order and kinetics of this reaction. The results show that the reaction order with respect to m-xylene was 1; to oxygen, zero, and the general order of reaction was 1. These data show that the pathway of the named reaction followed the Langmuir–Hinshelwood mechanism. Keywords Catalyst, perovskite, oxidation, m-xylene, kinetics References [1] Pena M.A and Fierro J.L.G (2001), “Chemical Stuctures and Performance of Perovskite Oxide”, Chem. Rev, 101, pp 1981-2018. [2] Seiyama T., Yamazoe N. and Eguchi K. (1985), “Characterization and Activity of some Mixed Metal Oxide Catalysts”, Ind. Eng. Chem. Prod. Res. Dev., 24, pp. 19-27.[3] Van Santen R. A., Neurock M. (2006), Molecular Heterogeneous catalysis, Wiley – VCH, pp.62-244. [4] Petrovics, Terlecki - Baricevic A., Karanovic Lj., Kirilov - Stefanov P. , Zdujic M., Dondur V., Paneva D., Mitov I., Rakic V. (2008), “LaMO3 (M = Mg, Ti, Fe) perovskite type oxides : Preparation, Characterization and Catalytic Properties in Methane deep Oxidation”, Appl. Catal. B, Env., 79, pp. 186-198. [5] Spinicci R., Tofanari A., Faticanti M., Pettiti I. and Porta P. (2001), “Hexane Total Oxidation on LaMO3 (M = Mn, Co, Fe) perovskite-type oxides”, J. Mole. Catal., 176, pp. 247-252. [6] Trần Thị Thu Huyền, Nguyễn Thị Minh Hiền, Nguyễn Hữu Phu (2006), “Study on the preparation of perovskite oxides La1-xSrxMnO3 (x = 0; 0,3; 0,5) by sol - gel citrate method and their catalytic activity for m-xylene toltal oxidation”, Hội nghị xuc tac va hấp phụ toan quốc lần thứ IV, Tp. Hồ Chi Minh, Tr. 477-482.[7] Trần Thị Thu Huyền, Nguyễn Thị Minh Hiền, Nguyễn Hữu Phu (2009), “Nghien cứu động học của phản ứng oxi hoa hoan toan m-xylen tren cac xuc tac perovskit LaMnO3 va La0,7A0,3MnO3 (A = Sr, Ca, Mg)”, Tạp chi Hoa học, T.47 (6A), Tr 132-136.[8] Geoffrey C. Bond, Catherine Louis, David T. Thompson (2006), “Catalysis by Gold”, Catalytic Science Series-Vol.6.