Abstract:

2Cu-1Ni/5g-Al₂O₃ catalysts were prepared by the deposition precipitation method for dimethyl ether steam reforming（DME SR）reaction. The effect of the different calcination temperature on catalyst structure and performance was investigated by using Brunauer-Emmett-Teller（BET）method，H₂ temperature-programmed reduction（H₂-TPR），and X-ray diffraction（XRD）. The results showed that the effect of calcination temperature on the catalyst was remarkable. The catalyst calcined at 500 ℃ had moderate BET surface area，pore volume and average pore diameter. As calcination temperature rose，the content of spinel copper increased，and the particle diameter of metal copper also increased. An appropriate calcination temperature could ensure a suitable strength of interaction between metal and carrier to achieve higher reactivity and stability. The optimum calcination temperature was 500 ℃.

摘要：

采用沉积-沉淀法制备了一系列不同焙烧温度的二甲醚水蒸气重整制氢催化剂2Cu-1Ni/5g-Al₂O₃（摩尔比），考察了焙烧温度对催化剂2Cu-1Ni/5g-Al₂O₃的结构及催化性能的影响，并运用N₂吸附-脱附（BET）、H₂程序升温还原（H₂-TPR）、X射线衍射（XRD）等手段对催化剂进行了表征与分析。结果表明，500 ℃焙烧的催化剂BET比表面积及孔容、孔径适中。随着焙烧温度的升高，以尖晶石态存在的铜组分比例逐渐增加，金属Cu的粒径也从12.6 nm增至33.2 nm。适当的焙烧温度可保证金属和载体之间的强度适中的作用力，从而保证催化剂具有较优的活性和稳定性。催化剂活性随着焙烧温度的增加先升高后减小，较优的焙烧温度为500 ℃。