Layered double-hydroxide catalytic coatings containing: cu, mg e al, achievable electro¬ chemically, for uses such as electrochemical reduction of carbon dioxide
Patent Information
- Application Number
- EP2023855814
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2022-12-16
- Filing Date
- 2023-12-14
- Publication Date
- 2025-10-22
AI Technical Summary
Current methods for electrochemical reduction of carbon dioxide face challenges in achieving high selectivity and productivity for C2 compounds, such as acetic acid, due to the poor catalytic activity of carbonaceous materials and the need for complex and high-temperature preparation processes of layered double hydroxides.
A nanostructured composite material with a layered hydrotalcite-type ternary structure of CuMgAl LDH, containing metal copper and cuprous ion as a redox couple, is developed, which is electrochemically deposited on a carbon gas diffusion membrane to enhance catalytic activity and selectivity for C2 products.
The composite material achieves high selectivity and productivity for acetic acid production with improved availability of CO2 on the electrode surface, using a simple electrochemical process at room temperature and ambient pressure, outperforming previous methods in terms of throughput and product yield.
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Figure 1.1
Abstract
Claims
CLAIMS1 . Nanostructured composite material with a layered hydrotalcite-type ternary structure of CuM- gAI LDH (layered double hydroxide) comprising particles of metal copper Cu° and particles containing cuprous ion Cu+(such as cuprous oxide), as a redox couple Cu° / Cu+, preferably placed in intimate contact with the layered hydrotalcite-type structure.
2. Nanostructured composite material according to claim 1 , wherein metal copper, Cu°, preferably as micro / nano particles and cuprous ion Cu+, preferably as micro / nano particles containing cuprous ion Cu+, more preferably as micro / nanoparticles of CU2O, are interleaved with or overlapped on or interconnected to such layers, in other words placed into direct contact with such layers.
3. Process of preparing a nanostructured composite material according to claim 1 , said process comprising a potentiodynamic electrodeposition, such as cyclic voltammetry, in which a triangular wave potential is applied to a stationary electrode dipped in an unstirred electrodeposition solution of soluble salts of cations Cu2+, Mg2+, and Al3+.4 Process according to claim 3, wherein the potential is varied from 0.0 V to -1 .4 V vs SCE (Saturated Calomel Electrode), with a scan rate comprised between 5 and 50 mVs1, preferably between 10 and 40 mVs-1, more preferably between 15 and 30 mVs-1, the most preferred being 30 rnVs-1.
5. Process according to claim 3, wherein the molar ratio between the sum of divalent cations (Cu2+and Mg2+) M(ll) and the trivalent cation (Al3+) M(lll), defined as the ratio M(ll) / M(lll), is 3:1 and / or where the molar ratio among different cations (Cu2+: Mg2+: Al3+) is 2:1 :1 , in the electrodeposition solution.
6. Catalytic system comprising the composite nanostructured material according to claim 1 , as a continuous or discontinuous coating in the form of layer or particle / s or of layer and particle / s, on a support made of a chemically inert material compared with the composite nanostructured material itself, and / or thermally and / or electrically inert, or insulating compared with the composite nanostructured material itself.
7. Catalytic system comprising the composite nanostructured material according to claim 1 as a continuous or discontinuous coating in the form of layer or particle / s or layer and particle / s, on a support made of a thermally and / or electrically conductive material.
8. Working electrode comprising the composite nanostructured material according to claim 1 as continuous or discontinuous coating, in the form of layer or particle / s or layer and particle / s, on a support made of an electrically conductive material.
9. Working electrode according to claim 8, wherein the electrically conductive support is a gas diffusion membrane made of carbon, preferably of carbon fiber.
10. Process for the electrochemical CO2 reduction into C2 compounds, preferably into acetic acid, wherein the working electrode, on which CO2 is reduced, is the working electrode according to claims 8 and 9.