【摘要】 考察了La2O3和Y2O3对CuO-ZnO-ZrO2催化剂甲醇水蒸汽重整反应性能的影响,并运用BET、XRD、TPR等手段对催化剂进行了表征。结果表明,La2O3和Y2O3的改性加入均能提高催化剂的活性,其中以Y2O3改性效果较为显著。催化剂中Y2O3含量不同,甲醇的转化率和H2产率也不相同,Y2O3含量为5 mol%时,CuO-ZnO-ZrO2-Y2O3催化剂甲醇转化率和H2产率最佳。Y2O3的加入使铜物种的分散度提高、CuO易还原。由于Y3+离子半径与Zr4+离子半径接近,Y3+可能部分替代Zr4+,增强了Y3+与其它金属之间的相互作用。更多还原

【Abstract】 The effects of La₂O₃ and Y₂O₃ on the modification of CuO-ZnO-ZrO₂ catalyst were studied for the methanol-steam reforming reaction.The catalysts were characterized by BET、XRD and TPR.The results show that the addition of La₂O₃ and Y₂O₃ can increase the catalytic activity,and the promotion impact of Y₂O₃ is more.The methanol conversion and the hydrogen yield of CuO-ZnO-ZrO₂-Y₂O₃ catalysts change with changing content of Y₂O₃ in the catalysts.The higher methanol conversion and the hydrogen yield are obtained when the temperature is 533 K and the content of Y₂O₃ is 5 mol %.The dispersion of CuO is improved and the CuO-ZnO-ZrO₂-Y₂O₃ catalyst is easily to be reduced.Because the ionic radii of Y³⁺ and Zr⁴⁺ are more similar in size,so it is easier for Y³⁺ substituting Zr⁴⁺,and enchance the interaction between Y³⁺ and other metallic ions.更多还原