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DUAL PROMOTION OF Cu/ZnO CATALYSTS MODIFIED BY ACETYLACETONE PRECURSORS FOR CO2 HYDROGENATION TO METHANOL
- Source :
- Química Nova, Vol 47, Iss 2 (2024)
- Publication Year :
- 2024
- Publisher :
- Sociedade Brasileira de Química, 2024.
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Abstract
- It is challenging to reveal the catalytic mechanism of Cu/ZnO catalysts with multivalent copper and improve the performance of CO2 hydrogenation to methanol. We synthesized Cu/ZnO catalysts with different Cu:Zn ratios using acetylacetone salts as the precursors, in which Cu, Cu2O, CuO coexist. The catalytic activity was significantly associated with the abundance of Cu+ active sites on the surface and the formation of more Cu+-ZnO interfaces. When the ratio of Cu:Zn = 5:4, the catalyst without reduction pretreatment showed good performance, with a CO2 conversion rate of 12.9%, methanol selectivity of 85.1%, and the space-time yield of 0.238 gMeOH gcat−1 h−1. It was suggested that Cu+ tends to closely bind with ZnO, and the preparation method leads to more Cu+-ZnO interfaces. The synergistic interaction between Cu+ and ZnO promoted the adsorption and dissociation of CO2 and H2, verifying its dual effect on CO2 and H2 and promoting CO2 hydrogenation to methanol.
Details
- Language :
- English, Spanish; Castilian, Portuguese
- ISSN :
- 16787064 and 01004042
- Volume :
- 47
- Issue :
- 2
- Database :
- Directory of Open Access Journals
- Journal :
- Química Nova
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.9b680ac8fbb34f828eb9ff8b832518e6
- Document Type :
- article
- Full Text :
- https://doi.org/10.21577/0100-4042.20230094