Abstract CuCeTiO x (CCT) catalyst is considered as a promising prospect attributable to their high activity for low-temperature CO oxidation. However, rapid deactivation when treating humid flue gas hindered their industrial exploitation. The hydroxide ion (OH − ) dissociated from H 2 O, and carbonate intermediates derived from CO/CO 2 deposited on the catalyst surface of CCT catalyst, inhibits the CO oxidation by surface oxygen on active sites. In this study, the detrimental effect caused by H 2 O and CO 2 were evaluated, and the performance of CCT catalysts were investigated and compared using in situ DRIFTs study. Further, intentional doping on the CCT using transition metal (e.g., Co and Mn) was performed to mitigate the catalyst deactivation caused by H 2 O and CO 2 . The incorporation of cobalt in Co-CCT altered the reaction pathway and mitigated the deactivation via enhancing the consumption of surface adsorbed OH - by CO, reducing the occupancy of active sites. Also, preferential adsorption of CO further suppressed the competition of OH - and CO 2 towards active sites on catalyst attributable to the abundant oxygen vacancies and low coordinated metal (i.e., Cu + , Ce 3+ ) in Co-CCT, which significantly enhanced the resistance to H 2 O and CO 2 in the flue gas. This work thoroughly analyzed the mechanism of H 2 O and CO 2 impacting the catalyst activity during low-temperature CO oxidation, is able to provide innovative insights for the design of highly-active and long-shelf life catalysts. Graphic Abstract The incorporation of cobalt in CuCeTiO x catalyst facilitates the formation of oxygen vacancies, the adsorption of CO, and the consumption of OH - , speeding up the CO oxidation to CO 2 and promoting the resistance to deactivation caused by H 2 O and CO 2 in the flue gas.

中文翻译：

---

用于烟道气中低温 CO 氧化的鲁棒 Cu 催化剂：通过共掺杂减轻失活

摘要 CuCeTiO x (CCT) 催化剂因其对低温 CO 氧化的高活性而被认为具有广阔的前景。然而，处理潮湿烟气时的快速失活阻碍了它们的工业开发。从 H 2 O 解离出来的氢氧根离子 (OH - ) 以及沉积在 CCT 催化剂表面上的 CO/CO 2 衍生的碳酸盐中间体，抑制了活性位点上表面氧对 CO 的氧化。在本研究中，评估了 H 2 O 和 CO 2 造成的不利影响，并使用原位 DRIFT 研究来研究和比较 CCT 催化剂的性能。此外，使用过渡金属（例如，Co和Mn）对CCT进行有意掺杂以减轻由H 2 O和CO 2 引起的催化剂失活。在 Co-CCT 中加入钴改变了反应途径并通过增加 CO 对表面吸附 OH - 的消耗来减轻失活，减少活性位点的占用。此外，CO 的优先吸附进一步抑制了 OH - 和 CO 2 对催化剂活性位点的竞争，这归因于 Co-CCT 中丰富的氧空位和低配位金属（即 Cu + 、Ce 3+ ），这显着增强了催化剂的活性。对烟气中的 H 2 O 和 CO 2 的耐受性。这项工作深入分析了低温CO氧化过程中H 2 O和CO 2 影响催化剂活性的机制，能够为高活性和长保质期催化剂的设计提供创新见解。图形摘要 CuCeTiO x 催化剂中钴的掺入促进了氧空位的形成，