Abstract
Supported metal catalysts are widely used in the chemical industry, commonly with added metal oxide promoters to enhance the catalytic performance. Here, we discuss manganese oxide as an efficient promoter for the Cu-based hydrogenation of ethyl acetate; a model hydrogenation reaction. A series of carbon-supported MnOx-Cu catalysts was prepared with 6 nm MnOx-Cu particles, while varying the Mn loading between 0 and 33 mol% Mn/(Cu + Mn), without changing the Cu loading or support structure. At temperatures of 180–210 °C and 30 bar pressure, the addition of 11 mol% Mn to Cu gave a 7-fold enhancement in activity, and better catalyst stability. Furthermore, the apparent activation energy decreased from ~100 to 50 kJ mol−1. State-of-the-art characterization allowed to establish a correlation between catalyst structure and performance.
| Original language | English |
|---|---|
| Pages (from-to) | 307-315 |
| Journal | Journal of Catalysis |
| Volume | 394 |
| Early online date | 13 Nov 2020 |
| DOIs | |
| Publication status | Published - Feb 2021 |
Funding
The authors thank Jan Willem de Rijk, Remco Dalebout, Neil Sainty and Roy Partington for support in catalytic experiments, Christa C. M. Oversteeg, Fei Chang, Herrick van Schaink, Ad van der Eerden and Alessandro Longo for their contributions to the X-ray absorption spectroscopy measurements and data processing. The authors acknowledge the awarded beamtime on the Dubble beamline 26A at Synchrotron ESRF under proposal number 26-11 1175. BP was gratefully acknowledged for funding RB, ERC (grant number ERC-2014-CoG-648991) for additional funding for PEdJ, and ERC (grant number ERC-AG338846) for additional funding for KPdJ and supporting the transmission electron microscopy facilities.
Keywords
- Carbon
- Copper
- Heterogeneous catalysis
- Hydrogenation
- Manganese
- Promoter
- Water