An emerging application for the WGS reaction is on-board purification and production of H2 for fuel cell powered vehicles. Existing commercial LTS catalyst are unsuitable for transportation applications because of their large volume and size, and the deactivation of the copper-based catalyst under the severe conditions encountered in an automotive system. To develop a high performance WGS catalyst, we have studied the WGS reaction over transition metal carbides and Pt supported cerium oxide catalysts. Molybdenum carbide (Mo2C) was demonstrated to be highly active for the WGS of a synthetic steam reformer exhaust steam. This catalyst was more active than a commercial LTS catalyst. It was found that Pt supported catalyst was more active than the LTS catalyst at a high temperature more than 250 ℃.