Production of hydrogen via dry reforming of methane over Co-containing catalysts

摘要

Increasing attention has been devoted to hydrogen production as a source of clean energy that is friendly to the atmosphere. Recently, dry reforming of methane has been used for hydrogen production that can be used in fuel cells or as a reducing agent. Dry reforming process is an excellent means of removing CO_2 and CH_4, greenhouse gases that cause global wanning. Catalyst activity and stability depends upon the support, active metal and methods of pretreatment. In the present work, the effect of calcination temperature on hydrogen production using cobalt supported with nano-sized cerium and zirconium catalysts was investigated. The catalysts were prepared by the impregnation method at different calcination temperatures (i.e., 500, 600, 700, 800 and 900°C). The performance of the catalysts was evaluated in a micro tubular reactor at 700°C, atmospheric pressure and F/W= 3.8L/h.g_(cat). BET, TGA, XRD, TPO and TPR techniques were used to characterize the prepared catalysts. The results revealed that the catalysts calcined at lower temperatures (500 & 600°C) exhibited better activity and higher hydrogen production than those calcined at higher temperatures. The hydrogen yields, for Co/ZrO_2 and Co/CeO_2 catalysts, calcined at 500°C and 600°C, were 75.8 % & 71.4% and 59.4% & 57.5% respectively.