Abstract：
:There is a lack of consensus on the charge state of active gold species in catalytic CO oxidation reaction. Herein, Au/SBA-15 catalyst was prepared by room temperature ozone treatment. Through diffuse reflectance Fourier-transform infrared spectroscopy (DRIFTS), two different gold species, Au0 and Auδ- with CO adsorption at about 2112 cm-1 and 2077 cm-1, were observed on Au/SBA-15. In CO oxidation mixture, the 2077 cm-1 band is completely attenuated while the 2112 cm-1 band retains some intensity. CO-Auδ- bonding is weaker than that of CO-Au0, but CO-Auδ- exhibits higher reactivity towards oxygen. Ozone treatment produces AuOx nanoparticles that is not stable and decomposes to metallic Au gradually. To our best knowledge, this is the first time to identify the presence and importance of Auδ- species for "inert" SiO2 supported gold catalyst.
journal_name
Chemospherejournal_title
Chemosphereauthors
Feng X,Meng D,Yang Y,Tan Z,Liang J,Xiao Cdoi
10.1016/j.chemosphere.2020.126274subject
Has Abstractpub_date
2020-07-01 00:00:00pages
126274eissn
0045-6535issn
1879-1298pii
S0045-6535(20)30467-7journal_volume
250pub_type
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