Nanoporous gold modified by atomic layer deposition of titania was employed as a model, inverse supported precious metal catalyst to explore the oxidative reactivity of Au/TiO₂ catalysts. The catalyst material is active for oxidation of CO using O from the titania lattice, even at low temperatures. The reactive lattice oxygen available for oxidative reactions was formed by thermal activation, with the total oxidative reactivity of the material showing a strong dependence on the annealing temperature prior to CO exposure. Finally, reduction of the titania via CO oxidation can be reversed under relatively mild conditions by exposure to O₂, presenting a viable mechanism for CO oxidation in steady state catalytic conditions.

中文翻译：

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纳米多孔金在二氧化钛中热活化形成活性晶格氧

以二氧化钛原子层沉积改性的纳米多孔金为模型，采用逆负载型贵金属催化剂研究了Au / TiO ₂催化剂的氧化反应性。即使在低温下，该催化剂材料对于使用来自二氧化钛晶格的O氧化CO也是有活性的。可用于氧化反应的反应性晶格氧是通过热活化形成的，该材料的总氧化反应性与暴露于CO之前的退火温度密切相关。最后，通过暴露于O ₂在相对温和的条件下可以逆转通过CO氧化还原二氧化钛，这表明在稳态催化条件下CO氧化的可行机理。