The investigation of individual reaction steps in the oxidative coupling of methane over lithium doped magnesium oxide

Ethylene From Natural Gas by Direct Catalytic Oxidation

“…were used as the starting materials for the catalysts, which were made by slurrying the solids in water followed by evaporation, drying and grinding (Ref. 8). No calcination took place before reaction.…”

“…24. As is stated in Chapter 7.7, the main selectivity loss at high methane conversion levels is caused by combustion of the ethylene produced.…”

“…The oxidation of CO to C0 2 in the gas phase (Ref. 8) is rather slow, which explains the very long residence times required to get carbon dioxide. Note that the points on the vertical axis, representing the calculated chemical equilibrium state, are covered very nicely by extrapolations of the experimental values.…”

“…In the calculations, only CjH, (ethane and ethylene in a fixed ratio of 2/3) and CO, (carbon monoxide and carbon dioxide in a fixed ratio of 1/1) were considered as the reaction products and only three reactions, representing the main reaction paths (Ref. 8), were taken into account. The kinetic data used is shown in Figure 8.1.4 and give the selectivity-conversion relationship as is shown in Figure 8.1.3, with an ideal plug flow reactor.…”

“…24). Methane is first converted to a methyl radical by a hydrogen abstraction step occurring at the catalyst.…”