Besides being used as an important chemical intermediate[1,2], dimethyl ether (DME) has received
significant attention as an alternative and clean diesel fuel, owing to its near-zero smoke production, higher cetane number, lower emission of particulates and NOx for combustion[3]. In view of the versatility of DME, many attentions have been focused on the development of an economically viable process for the synthesis of DME employing a stable and active catalyst. Traditionally, DME is produced by a two-step process; in the first step syngas(CO+H2) is transferred into methanol over a methanolsynthesis catalyst, and then in the second step methanol is dehydrated into DME over a solid acid catalyst.