سال انتشار: ۱۳۸۷

محل انتشار: دومین کنگره بین المللی علوم و فناوری نانو

تعداد صفحات: ۲

نویسنده(ها):

Z Fakhroueian – Chemistry Department, Alzahra University, Tehran, Iran
F Farzaneh – Chemistry Department, Alzahra University, Tehran
S Satari – RIPI, Nanotechnology Research Center, Tehran, Iran

چکیده:

The heterogeneously catalyzed OCM (Oxidative Coupling of Methane) seems to be one of the most promising routes to convert methane directly from the abundant natural gas (CH4) into C2H4 and C2H6 which is an available feed-stock for chemical industry [1]. Higher C2+ selectivity and yields have to be achieved mainly by development of more selective catalysts, but optimization of reaction conditions, reactor design and operation also offers possibilities to improve catalytic performance.The objective of the present work was to evaluate the synthesis catalyst with view of using nanocomposites and nanoparticles by applying of fast-quenching novel method for improvement catalytic performance.G.E. Keller and M.M. Bhasin [2] were pioneer, ‘s OCM since 1982. The formulation catalyst Mn/Na2 WO4/ SiO2 and Mn/Na 2WO4 / MgO have been prepared by many authors in OCM by now [3,4], and they could produce 16-25% yield for C2+ products. In this article nanocomposites and nanostructured catalysts were prepared by using various templates with coprecipitation and fast-quenching methods for M/ Mn/Na2WO4/ SiO2 nanocatalysts,, that M are alkali , alkaline earth , rare earth and transition state metal oxides as promoters over SiO2 supported, in order to enhance C2+ selectivity and yield [5]. Charge deficient oxygen sites were created and basic oxides generate synergistic effect and increasing the mobility of the surface lattice oxygen