Steady-state, transient and periodic operation studies of oxidative coupling of methane

Oxidative coupling of methane was studied under steady-state, transient and cycling modes of operation over two catalysts, Ce/Li/MgO and Li/MgO. The former catalyst was studied more extensively. The majority of the experiments were carried out at a pressure slightly above atmospheric and a temperature of 750;Addition of water vapor to the reactants was found to improve C;Transient experiments suggested that some of the carbon dioxide produced in the course of reaction adsorbs on the surface which acts as a reversible poison for the catalyst. Transient experiments also revealed that methane oxidation occurs in the absence of gas-phase oxygen over both catalysts. However, Ce/Li/MgO catalyst provides larger amount of lattice oxygen for the activation of methane. This indicates that the extent of lattice oxygen contribution has been increased by addition of CeO;Various feed composition policies were explored. Oxygen cycling and bang-bang cycling were found to improve both methane conversion and C...