【摘要】 通过X射线衍射和程序升温还原技术对CE1-XZRXO2(0≤X≤1)催化剂的结构和氧化还原性能进行了研究,同时考察了CE1-XZRXO2催化剂在CO2重整CH4反应中的催化性能,并与其氧化还原性能进行了关联.结果表明,当X≤0.25时,CE1-X-ZRXO2以立方相CE-ZR-O固溶体形式存在,氧化还原性随着ZR含量的增加而增加;当X>0.25时,以四方ZRO2相和立方相CE-ZR-O固溶体的混合相存在,氧化还原性随着ZR含量的增加而减弱.CE0.75ZR0.25O2具有最高的氧化还原性,CE1-XZRXO2对CO2重整CH4反应的催化活性依赖于其氧化还原性,催化剂的氧化还原性越强,反应物(CO2和CH4)的转化率越高,催化剂的稳定性也越好.氧化还原性能最强的CE0.75ZR0.25O2催化剂表现出最高的催化活性、抗积炭能力和稳定性.更多还原

【Abstract】 The structure and redox properties of Ce_1-xZr_xO₂（0≤x≤1） were characterized by X-ray diffraction（XRD） and H₂ temperature-programmed reduction（H₂-TPR）.The catalytic performance of the Ce_1-xZr_xO₂（catalysts） for CO₂ reforming of CH₄ was investigated at 700～850 ℃.The results of XRD and TPR showed that the samples existed as a cubic Ce-Zr-O solid solution and their reducibility increased with increasing Zr content when x≤0.25;while a tetragonal ZrO₂ phase mixed with a cubic Ce-Zr-O solid solution was detected for samples with x>0.25 and the overall reducibility of the mixed phases decreased with increasing Zr content.Thus,the sample with x=0.25,Ce_0.75Zr_0.25O₂,showed the highest reducibility.The catalytic performance of the Ce_1-xZr_xO₂ catalysts was closely related to their reducibility.The Ce_0.75Zr_0.25O₂ catalyst with the highest（reducibility） also showed the highest catalytic activity and stability for the reforming of CH₄ with CO₂.更多还原