1
|
Huang X, Li H, Zhang Y, Wu R, Ban L, Xi L, Yin Z, Peng J, Zhao Y, Fang L. Enhancement of Cu + stability under a reducing atmosphere by the long-range electromagnetic effect of Au. NANOSCALE 2022; 14:13248-13260. [PMID: 36052817 DOI: 10.1039/d2nr02407a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
In conventional thermocatalytic reactions under a reducing atmosphere, stabilization of the active Cu+ component and inhibition of over-reduction into metallic Cu0 are extremely challenging. In this study, Au@Cu2O core-shell nano-catalysts with different Cu2O shell thicknesses were synthesized, and the effect of the Au nano-core on Cu+ stability under a reducing atmosphere and the catalytic performance of Cu+ in the ethynylation of formaldehyde were investigated. The Au nano-core facilitates Cu2O dispersion and leads to an increase of 0.2-0.5 eV in electron binding energies of Cu2O and Cu2C2 in the range of 27-55 nm, attributed to the long-range electromagnetic effect of Au NPs. Specifically, active Cu+ centers exhibit high stability under a reducing atmosphere due to the long-range electromagnetic effect of the Au nano-core. In the ethynylation of formaldehyde as a probe reaction, Cu+/(Cu0 + Cu+) on Au@Cu2O catalysts remained at 88-91%. The catalytic performance in the ethynylation of formaldehyde revealed that the introduction of an Au nano-core into Cu-based catalysts increased the TOF from 0.37 to 0.7 h-1, and decreased the activation energy from 42.6 to 38.1 kJ mol-1. Additionally, the Cu+/(Cu0 + Cu+) ratios and the catalytic performance in the ethynylation of formaldehyde (BD yield = 65%, BD selectivity = 95%) on Au@Cu2O catalysts remained constant after nine cycles, while pure Cu2O readily deactivated due to the dramatically reduced Cu+/(Cu0 + Cu+) ratios and carbyne deposition. In summary, Cu+ in Cu-based catalysts showed high catalytic activity and stability during the ethynylation of formaldehyde due to the long-range electromagnetic effect of the Au nano-core.
Collapse
Affiliation(s)
- Xin Huang
- Engineering Research Center of Ministry of Education for Fine Chemicals, Shanxi University, Taiyuan 030006, China.
- School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, China.
| | - Haitao Li
- Engineering Research Center of Ministry of Education for Fine Chemicals, Shanxi University, Taiyuan 030006, China.
| | - Yin Zhang
- Engineering Research Center of Ministry of Education for Fine Chemicals, Shanxi University, Taiyuan 030006, China.
| | - Ruifang Wu
- Engineering Research Center of Ministry of Education for Fine Chemicals, Shanxi University, Taiyuan 030006, China.
| | - Lijun Ban
- School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, China.
| | - Lin Xi
- School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, China.
| | - Zhifang Yin
- School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, China.
| | - Jian Peng
- School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, China.
| | - Yongxiang Zhao
- Engineering Research Center of Ministry of Education for Fine Chemicals, Shanxi University, Taiyuan 030006, China.
| | - Li Fang
- School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, China.
| |
Collapse
|
2
|
Wang Y, Xu D, Zhang X, Hong X, Liu G. Selective C2+ alcohol synthesis by CO2 hydrogenation via a reaction-coupling strategy. Catal Sci Technol 2022. [DOI: 10.1039/d1cy02196f] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synergy of primary and promoting catalysts in close proximity facilitates the migration and insertion of CO*/CHxO* species, thus accelerating HA productivity over a multifunctional catalyst.
Collapse
Affiliation(s)
- Yanqiu Wang
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, P. R. China
| | - Di Xu
- School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, P. R. China
| | - Xinxin Zhang
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, P. R. China
| | - Xinlin Hong
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, P. R. China
| | - Guoliang Liu
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, P. R. China
| |
Collapse
|