论文部分内容阅读
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.
The structure and redox properties of CE1-XZRXO2 (0≤X≤1) catalysts were investigated by X-ray diffraction and temperature programmed reduction. The catalytic performance of CE1-XZRXO2 catalysts in the CH4 reactivity of CO2 reforming was also investigated. And the redox properties of CE1-X-ZRXO2 were studied. The results showed that CE1-X-ZRXO2 existed in the form of cubic phase CE-ZR-O solid solution when X≤0.25, and the redox activity increased with the increase of ZR content. , The mixed phase of the tetragonal ZRO2 phase and the cubic phase CE-ZR-O solid solution exists, and the redox activity decreases with the increase of ZR content.CE0.75ZR0.25O2 has the highest redox activity, and CE1-XZRXO2 has the highest emission of CO2 The catalytic activity of the whole CH4 reaction depends on its redox properties, the stronger the redox activity of the catalyst, the higher the conversion of the reactants (CO2 and CH4), the better the stability of the catalyst. 75ZR0.25O2 catalyst showed the highest catalytic activity, anti-carbon ability and stability.