A proposed reaction mechanism for the selective oxidation of methane with nitrous oxide over Co-ZSM-5 catalyst forming synthesis gas (CO + H2)

摘要: Abstract Probable reaction intermediates and mechanistic steps involved for the selective oxidation of methane (CH4) with nitrous oxide (N2O) forming synthesis gas (CO + H2) over Co-ZSM-5 was examined. To assess kinetics reactions were conducted within a temperature range 300 °C–550 °C at atmospheric pressure, composition reactant feed (N2O/CH4) varied between three fixed ratios (5, 3, 1). TPD, XRD, TEM FT-IR techniques used catalyst characterization studies. It found, that H2 selectivity is higher feeds lower N2O concentration. Furthermore, CO formation commences temperatures in comparison to which result methanol (CH3OH) carbon oxides (CO CO2) low CH4 conversions. Based on conditions, literature proposes direct an indirect route formation. Our catalytic study suggests formation; i.e. formed by decomposition intermediate species (methoxy CH2O). This supported spectroscopic investigation. Under favourable conditions catalyst, first oxidizes CH3OH, active intermediate, then subsequently converted into (formaldehyde) CH2O H2. highly reactive decomposes