Catalytic water gas shift

Prior to methanation, the gas product from the gasifier must be thoroughly purified, especially from sulfur compounds the precursors of which are widespread throughout coal (23) (see Sulfurremoval and recovery). Moreover, the composition of the gas must be adjusted, if required, to contain three parts hydrogen to one part carbon monoxide to fit the stoichiometry of methane production. This is accompHshed by appHcation of a catalytic water gas shift reaction. 

Conditioning of the raw syngas, meeting the quality stipulated for manufacture of DME or other potential products. This is attained by catalytic water-gas shift to adjust the CO/H2 ratio and catalytic hydrogenation of minor contaminants followed by the removal of C02 and acidic gases in a conventional wash system or in a novel, selective processes for deeper S-removal. 

A further complication is evident in the spectroscopic studies of the reacting iridium solutions, namely, a competing catalytic water gas shift reaction involving hydrido-iridium(III) species. Choice of reaction conditions determines the proportion of the iridium occupied in this catalytic cycle. 

The reaction implies a H2/CO ratio of at least 2 for the synthesis of the hydrocarbons, When the ratio is lower it can be adjusted in the reactor with the catalytic Water-Gas Shift (WGS) reaction ... 

Currently used for syngas production in conjunction with catalytic water-gas shift reaction for H2 production. 

The catalytic water-gas shift reactor has been demonstrated to reduce carbon monoxide (CO) to less than 0.5 %-vol. 

During the first year, most gasification trials were performed with the gasifier operated in conventional, air-blown mode. Experimental results included characterization of the gas obtained from gasification of switchgrass, preliminary evaluation of the performance of the steam reformer, and preliminary evaluation of the catalytic water-gas shift reactors. 

Photo-Catalytic Water-Gas Shift Reaction Chapter 8 209... 

S. S. Hla, G. J. Duffy, L. D. Morpeth, A. Cousins, D. G. Roberts, J. H. Edwards, Investigation of the effect of total pressure on performance of the catalytic water-gas shift reaction using simulated coal-derived syngases, Catal. Commun. 11 (2009) 272-275. 

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