2010 Volume 18 Pages 50-55
Catalysts for methanol steam reforming were prepared from the glassy-metal powder produced by gas atomizing method. The basic components of the alloys were cupper and zirconium, and a small amount of platinum was added to the key components. The alloy powdereasilymelted and fused together to form agglomerate at relatively low temperature in pretreatment process. Consequently, the surface area of the powder decreased and the catalytic activity was very low. Coating the powder by silicasuccessfully prevented the sintering of the alloys. The coated alloy powder was used as a catalyst for methanol steam reforming after pretreatment of oxidation in the air and reduction with hydrogen. The catalytic activity was one order higher than that of the catalyst prepared from the amorphous alloys producedby using single-roll quenching method. Since the reaction temperature could be decreased by 100 K because of the high activity, the deactivation of the catalytic activity was reduced. Although the amorphous alloy by using single-roll quenching methodwithout platinum did not show the activity, the powder alloy without platinum formed an active catalyst for the reaction. However, the concentration of carbon monoxide in the product gas was about 0.1%. This value is still high for the practical use as the catalyst for methanol steam reforming.