Tao Qingmei, Song Jiaojiao, Sun Na, Ren Yiming, Xiang Linlin, Liu Shoujie, Kuai Long
School of Chemical and Environmental Engineering, Anhui Laboratory of Clean Catalytic Engineering, Anhui Laboratory of Functional Coordinated Complexes for Materials Chemistry and Application, Anhui Polytechnic University, Wuhu 241000, China.
Chemistry and Chemical Engineering of Guangdong Laboratory, Shantou 515063, China.
Inorg Chem. 2022 Aug 1;61(30):11932-11938. doi: 10.1021/acs.inorgchem.2c01666. Epub 2022 Jul 17.
The properties of supports have a significant effect on the activity of noble metal single atoms. In this work, Co-doped CeO-supported single-atom Pt catalysts (Pt/Co-CeO) have been acquired by a synchronous pyrolysis/deposition route and demonstrated to promote low-temperature oxidation of CO. Revealed by a model reaction of 1% CO + 1% O + 98% He at a space velocity of 12,000 mL/g/h, CO conversion (100 °C) acquired on a (0.5% Pt)/(10% Co-CeO) catalyst (36.6%) was 3.6 and 4.9 times those of 0.5% Pt/CeO (10.0%) and 10% Co-CeO (7.4%) catalysts and 2.1 times that of their conversion sum (17.4%), confirming the positive role of the Co dopant in boosting the low-temperature oxidation of CO. The consistent results are also verified in the comparison of Pt/Co-ZnO with Pt/ZnO and Pt/Co-AlO with Pt/AlO. In addition, the activity of single-atom Pt/Co-CeO catalysts can be facilely modified by changing the loading of Pt and/or doping amount of Co. These reasonable data will provide a methodology to access more applicable catalysts for CO oxidation at low temperature.
载体的性质对贵金属单原子的活性有显著影响。在本工作中，通过同步热解/沉积路线获得了Co掺杂CeO负载的单原子Pt催化剂（Pt/Co-CeO），并证明其能促进CO的低温氧化。在12,000 mL/g/h的空速下，通过1% CO + 1% O + 98% He的模型反应揭示，在(0.5% Pt)/(10% Co-CeO)催化剂上获得的CO转化率（100°C时为36.6%）分别是0.5% Pt/CeO（10.0%）和10% Co-CeO（7.4%）催化剂的3.6倍和4.9倍，是它们转化率之和（17.4%）的2.1倍，证实了Co掺杂剂在促进CO低温氧化中的积极作用。在Pt/Co-ZnO与Pt/ZnO以及Pt/Co-AlO与Pt/AlO的比较中也验证了一致的结果。此外，通过改变Pt的负载量和/或Co的掺杂量，可以轻松调节单原子Pt/Co-CeO催化剂的活性。这些合理的数据将为获得更适用于低温CO氧化的催化剂提供一种方法。
