dimethyl ether dme to water in the mixture of dimethyl ether and water was 1 4 the amount of the catalyst mixture was 1 1 g and the contact time w f was about 3 3 g u2212 cat u00b7 hr mol the percent conversion of dimethyl ether was about 100 both for the mixture of the reforming catalyst and the cu u2014 zno u2014 al 2 o 3 co shift catalyst and the mixture of the reforming catalyst and the pt al 2 o 3 based co shift catalyst the yield of carbon monoxide co with carbon as reference was 21 for the mixture of the reforming catalyst and the cu u2014 zno u2014 al 2 o 3 co shift catalyst and 6 for the mixture of the reforming catalyst and the pt al 2 o 3 based co shift catalyst thus the percent conversion of dimethyl ether can be enhanced and the yield of carbon monoxide can be reduced as compared with the case where reforming is conducted in the presence of the reforming catalyst alone however when the mixture of the reforming catalyst and the cu u2014 zno u2014 al 2 o 3 co shift catalyst was used the percent conversion of dimethyl ether was almost 100 in the initial stage of reaction but.