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Influence of lattice oxygen on the catalytic activity of blue titania supported Pt catalyst for CO oxidation

机译：晶格氧对催化的影响活动的蓝色二氧化钛支持Pt催化剂对CO氧化

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摘要

Despite extensive research into understanding the reaction mechanism for CO oxidation over transition metals supported on TiO2, the active species for oxidation remains controversial. Herein, the characteristics of the active oxygen species of blue TiO2 with a higher concentration of oxygen vacancies as a model catalyst with deposited nano-sized Pt toward CO oxidation are unraveled. Pt deposited on blue TiO2 showed 8.8 times higher catalytic activity than that on TiO2 at 200 °C. Formation of the oxygen vacancies induced electron generation, and the electrons were transferred to CO, weakening the binding strength. The ratio of lattice oxygen on the top surface of Pt/blue TiO2 decreased from 50.4% before the reaction to 6.1% during the reaction, as analyzed by near ambient pressure X-ray photoelectron spectroscopy. The results directly show that the facile reducibility of surface lattice oxygen of blue TiO2 leads to the high activity of CO oxidation.
机译：尽管广泛的研究理解对CO氧化反应机理过渡金属支持二氧化钛,活跃氧化物种仍然存在争议。在此,活性氧的特点种蓝色二氧化钛浓度更高氧气作为模型催化剂与职位空缺对CO氧化沉积纳米Pt瓦解。倍比在二氧化钛的催化活性在200°C。诱导电子一代,电子被转移到公司,削弱了绑定的力量。Pt /蓝色表面二氧化钛从50.4%减少在反应中,反应前6.1%附近环境压力分析了x射线光电子能谱。显示表面的肤浅还原性晶格氧的蓝色二氧化钛导致高CO氧化的活性。

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