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• W4200173697 endingPage "15202" @default.
• W4200173697 startingPage "15194" @default.
• W4200173697 abstract "Infrared spectroscopy shows that H2 adsorbs heterolytically at the metal–support interface (MSI) of Au/TiO2 catalysts. This generates stable protonated MSI hydroxyls, which are chemically distinct from adsorbed water and free surface hydroxyls. IR spectra collected during H2 adsorption revealed changes associated with the loss of unprotonated interface hydroxyls (MSITiOH) and the appearance of protonated interface hydroxyls (MSITiOH2+). This allowed us to identify a spectroscopic signature associated with MSI hydroxyls interacting with Au nanoparticles and separate that signature from the unmodified hydroxyls that dominate the surface. Prior to H2 adsorption, MSI hydroxyls are electron-rich relative to other surface hydroxyls on the catalyst. As a consequence, MSI hydroxyls are more basic, which likely contribute to their involvement in H2 activation. The surface density of the MSITiOH2+ species was quantified with the broad-background absorbance (BBA) associated with electron injection into the support during H2 adsorption. Quantifying these signals across a series of catalysts showed that each Au perimeter atom is associated with one reactive MSITiOH group. This unexpected result indicates that Au modifies the local structural and electronic properties of the support. Thus, the synergism between Au and TiO2 produces electron-deficient Au particles, which are stronger Lewis acids, and increases the number of electron-rich MSI hydroxyls, which are stronger Brønsted bases." @default.
• W4200173697 created "2021-12-31" @default.
• W4200173697 creator A5018476423 @default.
• W4200173697 creator A5021470967 @default.
• W4200173697 creator A5023674044 @default.
• W4200173697 creator A5091437984 @default.
• W4200173697 date "2021-12-07" @default.
• W4200173697 modified "2023-10-17" @default.
• W4200173697 title "Hydrogen Adsorption at the Au/TiO₂ Interface: Quantitative Determination and Spectroscopic Signature of the Reactive Interface Hydroxyl Groups at the Active Site" @default.
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