氢溢流
催化作用
氢
氢气储存
无机化学
化学
密度泛函理论
金属
吸附
氧化物
铂金
物理化学
计算化学
有机化学
作者
Gargi Dutta,Umesh V. Waghmare,Tinku Baidya,M. S. Hegde
摘要
We have investigated the concept of hydrogen spillover by a density functional theory (DFT) approach in combination with experimental observations. A H/Pt molar ratio of 5 to 9 is observed over Ce1−xPtxO2−δ catalyst, where Pt is present in the +2 ionic state. The total hydrogen adsorbed over the catalyst is ∼30 times higher than that over nano-Pt metal particles. NMR study show protonic hydrogen over the catalyst. DFT calculations indeed support the enhanced adsorption of hydrogen on the Pt-ion-doped ceria surface via spillover to the oxide support. Further, the calculations confirm the formation of protonic hydrogen on the catalyst surface in contrast to the formation of hydridic hydrogen on Pt metal.
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