Abstract

A main component in producing ethylene from natural is methane. By using oxidative coupling of methane (OCM) reaction is a promising route. Catalytic tubular reactors are found to have advantages in terms of oxygen supply to the catalyst. To achieve this objective, a unified time-independent one-dimensional pseudo-homogeneous model is developed. Changing the inlet conditions, the sensitivity of the proposed model is analysed. Investigations were made in terms of parametric sensitivity and fixed bed reactor response by changing inlet flow velocities, concentrations and temperatures. The kinetic data of the reactions involved were estimated using linear regression. The effect of variables like, methane flow velocities, operating conditions, temperature, properties of catalysts on methane conversion and yield are studied from simulation results. All the feasible reactions for OCM are included in the proposed scheme of the reactions. The present work combines reaction engineering aspects with the experimental kinetic results previously obtained to predict OCM reactor performance under various operating conditions. Model equations are solved using the Runge Kutta method. The simulated results using the proposed kinetic model matched the experimental results of OCM reaction within a deviation range of ±20%.

Keyword

Oxidative coupling of methane (OCM), Kinetic modelling, Mixed-oxide Catalyst, Conversion.

Cite this article

Miriyala K, Inguva BK

Refference

[1][1]Lunsford JH. Catalytic conversion of methane to more useful chemicals and fuels: a challenge for the 21st century. Catalysis Today. 2000; 63(2-4):165-74.

[2][2]Ross JR, Van Keulen AN, Hegarty ME, Seshan K. The catalytic conversion of natural gas to useful products. Catalysis Today. 1996; 30(1-3):193-9.

[3][3]Keller GE, Bhasin MM. Synthesis of ethylene via oxidative coupling of methane: i. determination of active catalysts. Journal of Catalysis. 1982; 73(1):9-19.

[4][4]Akin FT, Lin YS. Controlled oxidative coupling of methane by ionic conducting ceramic membrane. Catalysis Letters. 2002; 78(1-4):239-42.

[5][5]Wang W, Lin YS. Analysis of oxidative coupling of methane in dense oxide membrane reactors. Journal of Membrane Science. 1995; 103(3):219-33.

[6][6]Wang K, Ji S, Shi X, Tang J. Critical influence of BaCO 3 on low temperature catalytic activity of BaCO 3/ZrO 2 catalysts for oxidative coupling of methane. Catalysis Letters. 2009; 129(1-2):156-62.

[7][7]Stansch Z, Mleczko L, Baerns M. Comprehensive kinetics of oxidative coupling of methane over the La2O3/CaO catalyst. Industrial & Engineering Chemistry Research. 1997; 36(7):2568-79.

[8][8]Simon Y, Baronnet F, Marquaire PM. Kinetic modeling of the oxidative coupling of methane. Industrial & Engineering Chemistry Research. 2007; 46(7):1914-22.

[9][9]Sun J, Thybaut JW, Marin GB. Microkinetics of methane oxidative coupling. Catalysis Today. 2008; 137(1):90-102.

[10][10]Farsi A, Moradi A, Ghader S, Shadravan V, Manan ZA. Kinetics investigation of direct natural gas conversion by oxidative coupling of methane. Journal of Natural Gas Science and Engineering. 2010; 2(5):270-4.

[11][11]Sinev MY, Fattakhova ZT, Lomonosov VI, Gordienko YA. Kinetics of oxidative coupling of methane: bridging the gap between comprehension and description. Journal of Natural Gas Chemistry. 2009; 18(3):273-87.

[12][12]Shahri SM, Alavi SM. Kinetic studies of the oxidative coupling of methane over the Mn/Na2WO4/SiO2 catalyst. Journal of Natural Gas Chemistry. 2009; 18(1):25-34.

[13][13]Cheng S, Shuai X. Simulation of a catalytic membrane reactor for oxidative coupling of methane. AIChE Journal. 1995; 41(6).

[14][14]Yaghobi N, Ghoreishy MH. Oxidative coupling of methane in a fixed bed reactor over perovskite catalyst: a simulation study using experimental kinetic model. Journal of Natural Gas Chemistry. 2008; 17(1):8-16.

[15][15]Santamaria JM, Miro EE, Wolf EE. Reactor simulation studies of methane oxidative coupling on a sodium/nickel-titanium oxide (NiTiO3) catalyst. Industrial & Engineering Chemistry Research. 1991; 30(6):1157-65.

[16][16]Jeon W, Lee JY, Lee M, Choi JW, Ha JM, Suh DJ, et al. Oxidative coupling of methane to C2 hydrocarbons on the mg–ti mixed oxide-supported catalysts at the lower reaction temperature: role of surface oxygen atoms. Applied Catalysis A: General. 2013; 464:68-77.

[17][17]Jin W, Gu X, Li S, Huang P, Xu N, Shi J. Experimental and simulation study on a catalyst packed tubular dense membrane reactor for partial oxidation of methane to syngas. Chemical Engineering Science. 2000; 55(14):2617-25.