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Understanding surfaces using probe molecules and in situ spectroscopies
Published on 2024-04-1837 Views
Spectroscopic techniques represent a “Swiss Army Knife” in modern chemistry, since their capability to shed light on the intimate nature of molecules and materials, as well as over their mutual in
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Presentation
Understanding surfaces using probe molecules and in situ spectroscopies00:00
Surfaces00:09
Spectroscopy00:53
The examples selected in this contribution02:35
Zeolites03:08
Metal-organic framework” (MOF-n)04:12
MOF era05:04
MOF vs zeolites: chemical& structuralflexibility06:57
1# Birth of the acidity in a zeolite: the Brønsted site07:25
The Brønsted site in a zeolite07:34
MTO conversion at low temperature over acidic zeo10:57
The Brønstedsite in a zeolite14:36
2# Bi functional catalysts: from CO2 to hydrocarbons15:40
Toward tandem CO2 conversion16:09
Bi-functional catalyst: from CO2 to hydrocarbons17:42
Zn-doped ZrO219:38
How to promote the CH3OH production22:06
How to promote the CH3OH production22:18
Zn-dopedZrO222:18
3# Cu based catalysts for C-H activation25:59
Cu-exchanged zeolites27:06
Cu(II) vs Cu(I) in zeolite29:55
Cu quantification31:05
Volumetric approach32:18
An indirect evidence of Cu(I) presence33:12
Attenuation coefficient33:52
Directly probing Cu in different frameworks34:16
XAS: temperature programmed desorption35:19
Catching intermediates36:22
Multivariate Curve Resolution37:38
EXAFS fits to discriminate different sites38:45
Time-dependent DFT for electronic transitions39:14
Taking inspiration from a totally different field:40:36
Oxygenation of cyclohexene catalyzed by a Cu-bipyridine homoleptic complex40:44
From the ligands to the MOFs42:09
Take home messages46:10
Acknowledgements47:00