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Effect of the ZnO/SiO2 ratio on the structure and catalytic activity of Cu/SiO2 and Cu/ZnO catalysts in water-containing ester hydrogenation.
- Source :
- New Journal of Chemistry; 9/14/2020, Vol. 44 Issue 34, p14560-14567, 8p
- Publication Year :
- 2020
-
Abstract
- The effects of the ZnO/SiO<subscript>2</subscript> ratio on the water tolerance of Cu/SiO<subscript>2</subscript> and Cu/ZnO catalysts were studied by ethyl acetate with 5 wt% water hydrogenation. Notably, the addition of an appropriate amount of ZnO endows Cu/SiO<subscript>2</subscript> catalysts with satisfactory water-tolerant hydrogenation performance by a decrease in the reaction temperature without sacrificing conversion. At the same time, agglomeration can be alleviated for Cu/ZnO catalysts due to the optimal addition of SiO<subscript>2</subscript>, which is considered as a partition material that effectively hinders the agglomeration of the Cu/ZnO catalyst. However, the addition of ZnO was not favourable for the copper dispersion of Cu/SiO<subscript>2</subscript>. The stability of Cu/SiO<subscript>2</subscript> catalyst quickly degraded due to excessive ZnO being introduced by sintering. The copper dispersion of Cu/ZnO catalysts initially increased with increasing SiO<subscript>2</subscript> content, but then decreased. The addition of excess SiO<subscript>2</subscript> also led to decreased activity and rapid deactivation of the Cu/ZnO catalyst. In our study, the appropriate addition of ZnO (5 wt%) and SiO<subscript>2</subscript> (5 wt%) had a positive effect on the Cu/SiO<subscript>2</subscript> and Cu/ZnO catalysts, respectively. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 11440546
- Volume :
- 44
- Issue :
- 34
- Database :
- Complementary Index
- Journal :
- New Journal of Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 145432003
- Full Text :
- https://doi.org/10.1039/d0nj03201h