from first principles PP-I-1

PP-IV-15Comparative Study of Oxidative Coupling of Methane to Ethane andEthylene over Na-W-Mn/SiO 2 and La-Sr/CaO CatalystsMatus E.V. 1 , Kuznetsov V.V. 1 , Ismagilov I.Z. 1 , Mota N. 2 , Navarro R.M. 2 , Kerzhentsev M.A. 1 ,Ismagilov Z.R. 1,3 , Fierro J.L.G. 21 Boreskov Institute of Catalysis SB RAS, Novosibirsk, Russia2 Instituto de Catálisis y Petroleoquímica, CSIC, Madrid, Spain3 Institute of Coal Chemistry and Material Science SB RAS, Kemerovo, Russiavadimk@catalysis.ruThe direct conversion of methane to valuable products is the most attractive and economicroute of natural gas valorization. The oxidative coupling of methane (OCM) is a challengingprocess of one-stage C 2 hydrocarbons (ethane, ethylene) production from CH 4 [1,2]. Thepresent work is focused on the study of OCM reaction over two different catalytic systems -Na-W-Mn/SiO 2 and La-Sr/CaO in order to gain information about the role of variouschemical components in the formation of active phase and reaction performance. Thecatalysts were prepared with variation of synthesis method and metals content, studied by thephysicochemical methods and tested in the OCM reaction in a fixed-bed reactor with massspectrometricgas analysis. It was established that for Na-W-Mn/SiO 2 catalysts the synthesismethod and type of SiO 2 have significant effect on the texture, while the Na/W ratio definesthe phase composition. For La-Sr/CaO catalysts the synthesis method determines both thespecific surface area (S BET ) and XRD phase composition: for example, the phases of CaO,La 2 O 3 and SrO with S BET ~ 1 m 2 /g were identified in the sample prepared from the physicalmixture of oxide precursors, while those of CaO, La 2 O 3 and SrCO 3 with S BET ~ 10 m 2 /g - inthe sample prepared by citrate sol-gel methods. The OCM kinetic data over Na-W-Mn/SiO 2and La-Sr/CaO catalysts were compared and correlated with the results of DTA-TG, TPR,XPS and HRTEM analyses. As a result, the effects of Na-W-Mn/SiO 2 and La-Sr/CaO catalystcompositions on their physicochemical properties and activity in the OCM were elucidated.The presented research has received funding from the European Union 7 th Framework Programme(FP7/2007-2013) under Grant Agreement #262840. The authors are thankful to Dr. V.A. Ushakov, Dr.T.Ya. Efimenko and Dr. G.S. Litvak from BIC SB RAS for their help with catalyst characterization.References:[1] V.S. Arutyunov, O.V. Krylov, Oxidative conversions of methane. Moscow: Nauka, 1998. 361 p.[2] Z.R. Ismagilov, A. Parmaliana, F. Frusteri, D. Miceli, A.A. Kirchanov, G.B. Barannik, Catal.Today 24 (1995) 281.299