三维有序大孔 CoCeO 催化剂中钴和铈物种在柴油 soot 催化氧化反应中的作用。
Roles of cobalt and cerium species in three-dimensionally ordered macroporous CoCeO catalysts for the catalytic oxidation of diesel soot.
机构信息
The Key Laboratory of Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.
The Key Laboratory of Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.
出版信息
J Colloid Interface Sci. 2018 Dec 15;532:579-587. doi: 10.1016/j.jcis.2018.08.018. Epub 2018 Aug 9.
Three-dimensionally ordered macroporous (3DOM) CoCeO oxides with different Co/Ce atomic ratios were synthesized by a colloidal crystal template (CCT) method. They show higher activity for soot combustion in O than single CeO and CoO under loose contact conditions. XRD, Raman, XPS, H-TPR and soot-TPR characterizations were carried out to study the surface and bulk oxygen vacancies and to correlate them to the activity. There exists electron transfer from Ce to Co in the matrix. Both Ce and Co species contribute importantly to the creation of surface and bulk oxygen vacancies, which determine the ignition and burnout temperatures of the catalysts, respectively.
采用胶体晶体模板（CCT）法合成了不同 Co/Ce 原子比的三维有序大孔（3DOM）CoCeO 氧化物。在松散接触条件下，它们在 O 中对烟尘燃烧的活性高于单 CeO 和 CoO。通过 XRD、Raman、XPS、H-TPR 和烟尘-TPR 表征研究了表面和体相氧空位，并将其与活性相关联。在基体中存在从 Ce 到 Co 的电子转移。Ce 和 Co 物种都对表面和体相氧空位的形成有重要贡献，分别决定了催化剂的着火和燃尽温度。
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