Base metal catalyst, oxidation carbon monoxide over

The oxidation of carbon monoxide over a base metal catalyst was selected because it is a highly exothermic reaction whose rate has an approximate first order dependence on the concentration of... 

Methyl formate is expected to be one of the intermediates of the methanol-based industries that produce dimethylformamide, acetic acid, pure hydrogen, carbon monoxide, etc. A number of patented catalysts (J8) are therefore composed of copper oxide as a main ingredient and include a variety of metal oxide additives. In our comparative studies, some of these catalysts exhibit fairly good activity but do not exceed Cu " -TSM in activity and selectivity (26). The results of the reactions over these patented catalysts, which have relatively high performance levels, are illustrated in Fig. 4 together with the result obtained with Cu -TSM the yield of methyl for-... 

Owing to the negative reaction order of carbon monoxide for the preferential oxidation over noble metal based catalysts such as platinum [114,115] and platinum/ rhodium [116], the amount of catalyst required to achieve 90 or 99.9% conversion does not increase significantly [114]. 

Palladium is the precious metal most frequently apphed for methanol steam reforming [176-178]. Despite its higher price compared with the copper-based systems, it is an attractive alternative owing to the potential for higher activity and greater robustness, which are key features for small scale reformers. The combination of palladium and zinc showed superior performance and soon the formation of a palladium-zinc alloy was identified as a critical issue for optimum catalyst performance [179]. Besides palladium/zinc oxide, palladium/ceria/zinc oxide may well be another favourable catalyst formulation [177]. However, precious metal based catalysts have a tendency to show higher carbon monoxide selectivity than copper-zinc oxide catalysts, because it is a primary product of the reforming reaction over precious metals. 

---