Cu/ZrO2催化剂上乙醇水蒸气重整反应的研究: Ⅱ 反应条件的影响

In the previous paper, the catalytic performances of Cu/ZrO2 and the effects of the catalysts preparation parameters on the steam reforming of ethanol were investigated. In this paper, the influences of the reaction conditions on the reaction are further examined. Cu/ZrO2 catalysts were prepared by precipitation/alcogel and impregnation methods. The ethanol steam reforming reactions were carried out in a flow-type fixed bed micro-reactor (quartzes tube) at atmospheric pressure. The catalysts were also characterized by H2-TPR. The influences of the reduction temperature of the catalysts, reaction temperature, water/ethanol ratio and space velocity on the steam reforming of ethanol and the stability of Cu/ZrO2 catalyst were investigated. The results showed that the conversion of ethanol increased while H2 selectivity decreased with the increase of the reaction temperature in the range of 300℃～500℃. The influence of the reduction temperature of the catalysts on the conversion was not significant, although the reduction at 300℃ or 400℃ was favorable for the H2 formation in the reaction. High water/ethanol ratios resulted in the high ethanol conversion and high H2 selectivity. With the increase of space velocity, the ethanol conversion and H2 selectivity decreased. 8％Cu/ZrO2 showed relatively high stability for 22h at 400℃~450℃.