Effect of the Preparation Method of Support on the Aqueous Phase Reforming of Ethylene Glycol Over 2 wt% Pt/Ce_(0.15)Zr_(0.85)O_2 Catalysts

摘要

The effect of catalyst support on the aqueous phase reforming of ethylene glycol over supported 2 wt% Pt/Ce_(0.15)Zr_(0.85)O_2 catalysts have been investigated. Various types of Ce_(0.15)Zr_(0.85)O_2 mixed oxides were prepared by hydrothermal precipitation (CZH), modified precipitation (CZM), co-precipitation (CZC), sol-gel (CZS) methods, respectively. Catalysts were characterized by XRD, N_2 sorption analysis, and cyclohexane dehydration for relative metal dispersion. The support effect on the activity of 2 wt% Pt/Ce_(0.15)Zr_(0.85)O_2 catalysts with different preparation method was given as follows: CZH < CZM < CZC < CZS. Pt/Ce_(0.15)Zr_(0.85)O_2 (CZS) catalyst showed good catalytic activity for APR reaction due to its high metal dispersion and reducibility. The effect of reaction conditions such as reaction temperature, weight hourly space velocity (WHSV) was also studied. The hydrogen production rate and hydrogen yield increased in proportion to the reaction temperature and corresponding system pressure, whereas WHSV did not affect.