Methane coupling

The lithium oxide-promoted barium oxide also functions as a catalyst for the methane coupling reaction, but the mechanism is not clearly understood at the present time. The only comment that might be offered here is that the presence of ions on the surface of this material might etdrance the formation of methyl radicals drrough the formation of hydroxyl groups thus... 

Oxidative Methane Coupling Nonporous Zr-Y-Ti-based membranes Nonporous PbO/MgO membranes... 

Oxidative methane coupling. MngCa r OjK catalyst placed in the pores of the tube. Ethylene and ethane synthesis from methane. Li/MgO (3 wt. % Li) catalyst placed in the pores of the tube. T 850 C. Conversion 30%. Selectivity to Cj products 60% T 700-750°C. Conversion 40%. Selectivity to Cj products 55%. ... 

Porous alumina tube externally coated with a MgO/PbO dense film (in double pipe configuration), tube thickness 2.5 mm, outer diameter 4 mm, mean pore diameter 50 nm, active film-coated length 30 mm. Feed enters the reactor at shell side, oxygen at tube side. Oxidative methane coupling, PbO/MgO catalyst in thin film form (see previous column). r-750X,Pr ed 1 bar. Conversion of methane <2%. Selectivity to Cj products > 97%. Omata et al. (1989). The methane conversion is not given. Reported results are calculated from permeability data. 

Table I. Oxidative Methane Coupling over Praseodymium Compounds...

Figure 3 Schematic of the experimental set-up employed to study the methane decomposition reaction methanizer coupled with the FID was used to quantify ppm levels of CO in the hydrogen stream ...

During the high-temperature operation of methane coupling catalysts, a number of components in the multiphase systems (lead, alkalis, chlorine) are susceptible to evaporation. Efforts in the early 1990s have concentrated on the preparation of stable catalyst formulations with increased activity and selectivity.322,345,346... 

The vast majority of possible applications of reactive adsorption aim at the improvement of the product yield by shifting the equilibrium in the required direction. In contrast to the nonreactive adsorption techniques, such as simulated moving beds and pressure-swing adsorption, and despite its great potential [for example, a 12-fold higher conversion per pass in oxidative methane coupling (67)], the... 

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