Methane conversion, moving

Fig. 5 Axial temperature and methane conversion distributions in a catalytic combustor. Conditions are as in Fig. 4, except that the temperature of the feed is now 280°C. The lower inlet temperature moves the ignition point downstream from the inlet of the monolith, but washcoat temperatures are not significantly reduced. (View this art in color at WWW. dekker. com.)...

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... 

Thus, in the case of the entrained-bed (dual flow) reactor, the methane content is very low and does not require specific fractionation. In the fluidized bed reactor, hydrocarbons other than methane are not formed. With the moving bed technique, operating in countercurrent flow, the hydrocarbon content (CH , CvH ) is sometimes high enough to require their separation from the gas produced, and possibly their conversion by supplementary steam reforming. A more detailed analysis of the main gasification processes under development or already industrialized is given in Table 1.5. 

Qi et al. [32] tested autothermal reforming of n-octane over a ruthenium catalyst, which was composed of 0.5 wt.% ruthenium stabilized by ceria and potassium on y-alumina. It showed full conversion of n-octane for 800 h. However, the selectivity moved from carbon dioxide and methane toward carbon monoxide and light hydrocarbons, which has to be regarded as an indication of catalyst degradation during long-term tests despite the fact that full conversion was achieved. After 800 h the catalyst consequently showed incomplete conversion. Tests performed on the spent catalyst revealed losses of specific surface area and of 33 wt.% of the noble metal. 

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