Photo-chemically-deposited and industrial Cu/ZnO/Al[sub]2O[sub]3 catalyst material surface structures during CO[sub]2 hydrogenation to methanol
EXAFS, XANES and XPS analyses of phases after oxidation, reduction, and reaction
Abstract
Industrial Cu/ZnO/Al2O3 or novel rate catalysts, prepared with a photochemical deposition method, were studied under functional CH3OH synthesis conditions at the set temperature (T) range of 240–350 °C, 20 bar pressure, and stoichiometric carbon dioxide/hydrogen composition. Analytical scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), X-ray adsorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) methods were systematically utilized to investigate the interfaces, measured local geometry, and chemical state electronics around the structured active sites of commercially available Cu/ZnO/Al2O3 material or synthesized Cu/ZnO. Processed Cu K-edge EXAFS analysis suggested that various Cu atom species, clusters, metallic fcc Cu, Cu oxides (Cu2O or CuO) and the Cu0.7Zn2 alloy with hexagonal crystalline particles are contained after testing. It was proposed that in addition to the model’s Cu surface area, the amount, ratio and dispersion of the mentioned bonded Cu compounds significantly influenced activity. Additionally, XPS revealed that carbon may be deposited on the commercial Cu/ZnO/Al2O3, forming the inactive carbide coating with Cu or/and Zn, which may be the cause of basicity’s severe deactivation during reactions. The selectivity to methanol decreased with increasing T, whereas more Cu0.7Zn2 inhibited the CO formation through reverse water–gas shift (RWGS) CO2 reduction.
Keywords
CH3OH synthesis;Cu/ZnO-based catalyst;XPS;XANES;EXAFS analyses;catalyst selectivity;
Data
| Language: | English |
|---|---|
| Year of publishing: | 2021 |
| Typology: | 1.01 - Original Scientific Article |
| Organization: | UNG - University of Nova Gorica |
| UDC: | 53 |
| COBISS: |
65711875
|
| ISSN: | 1011-372X |
| Views: | 1461 |
| Downloads: | 0 |
| Average score: | 0 (0 votes) |
| Metadata: |
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Other data
| URN: | URN:SI:UNG |
|---|---|
| Type (COBISS): | Not categorized |
| Pages: | str. 3114-3134 |
| Volume: | ǂVol. ǂ151 |
| Issue: | ǂiss. ǂ11 |
| Chronology: | 2021 |
| DOI: | 10.1007/s10562-021-03556-1 |
| ID: | 12977348 |
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