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- W3125954554 abstract "CO oxidation is one of the most widely studied ones among heterogeneous gold canalized reactions,but there are still inconsistent views on the charge state of the active site(cationic Au^δ+,metallic Au0 or anionic Au^δ-).Herein,Au/SBA-15 catalyst was prepared with[Au(en)2]Cl3 as the precursor.The CO adsorption on Au/SBA-15 catalyst and their evolution under different conditions were investigated by diffuse reflection Fourier transform infrared spectroscopy(DRIFTS).The thermal treatment during the catalyst preparation has great impact on the CO adsorption capacity.On the initially reduced Au/SBA-15,the residual ethylenediamine ligands cover the gold sites which results in no adsorption capacity for CO;but after reduction-calcined-reduction treatment,it gains the ability to adsorb CO.There are actually two sites on Au/SBA-15:Au0 and Au^δ-corresponding to two adsorption peaks in DRIFT spectra:2111 cm^-1(CO-Au0)and 2076 cm^-1(CO-Au^δ-).The CO adsorption on Au0 is stronger than on Au^δ-,whereas the CO adsorbed on Au^δ-has higher reactivity to O2." @default.
- W3125954554 created "2021-02-01" @default.
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- W3125954554 date "2020-08-01" @default.
- W3125954554 modified "2023-09-25" @default.
- W3125954554 title "DRIFTS Characterization of Charge State of Surface Site in Au/SBA-15" @default.
- W3125954554 doi "https://doi.org/10.3724/sp.j.7102727946" @default.
- W3125954554 hasPublicationYear "2020" @default.
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