281261 Oxidative Coupling of Methane Using Solution Combustion Synthesized Catalytic Materials

Wednesday, October 31, 2012
Hall B (Convention Center )
Ranjita Ghose, Hyun Tae Hwang and Arvind Varma, School of Chemical Engineering, Purdue University, West Lafayette, IN

Oxidative Coupling of Methane (OCM) to C2 hydrocarbons (ethane and ethylene) is an attractive opportunity for valorization of methane, which is the main constituent of natural gas (typically > 95%), for which the reserves are estimated to far exceed those of crude oil1. Solution combustion synthesis, a novel one-step technique for the preparation of nanostructured complex metal oxides 2-4, was used successfully for synthesis of several promising OCM catalyst series with varying metal ratios: (a) Strontium–Aluminum mixed oxides (b) Sodium–Lanthanum oxides (c) Strontium-Aluminum-Lanthanum mixed oxides (d) Na2WO4-Mn/SiO2.

The various catalyst series were optimized by varying the temperature, flowrates and feed CH4/O2 ratios. All these catalysts exhibit C2 yields among the highest in the literature, a superior C2 selectivity and a higher desired ethylene/ethane ratio. Among the four catalyst series tested, the Na2WO4-Mn/SiO2 series showed the best performance, for which detailed characterization was conducted to understand the basis for catalyst performance.

References:

(1) Kondratenko E.V., Baerns M., Handbook of Heterogeneous Catalysis, Viley-VCH Verlag 2008, 3010-3023.

(2) Deshpande, K.; Mukasyan, A.; Varma, A., Journal of the American Ceramic Society 2003, 86 (7), 1149-1154.

(3) Deshpande, K.; Mukasyan, A.; Varma, A., Chemistry of Materials 2004, 16 (24), 4896-4904.

(4)  Erri, P.; Dinka, P.; Varma, A., Chemical Engineering Science 2006, 61 (16), 5328-5333.


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