Abstract
In this report, for the first time, it has been observed that proton-conducting oxide BaZr0.1Ce0.7Y0.2O3−δ (BZCY) has significant promotion effect on the catalytic activity of Ni towards ammonia synthesis from hydrogen and nitrogen. Renewable hydrogen can be used for ammonia synthesis to save CO2 emission. By investigating the operating parameters of the reaction the optimal conditions for this catalyst were identified. It was found that at 620 °C with a total flow rate of 200 mL min−1 and a H2/N2 mol ratio of 3, an activity of approximately 250 μmol g−1 h−1 can be achieved. This is ten times larger than that for the unpromoted Ni catalyst under the same conditions although the stability of both catalysts in the presence of steam was not good. The specific activity of Ni supported on proton-conducting oxide BZCY is approximately 72 times higher than that of Ni supported on non-proton conductor MgOCeO2.
| Original language | English |
|---|---|
| Pages (from-to) | 17726-17736 |
| Number of pages | 11 |
| Journal | International Journal of Hydrogen Energy |
| Volume | 43 |
| Issue number | 37 |
| Early online date | 23 Aug 2018 |
| DOIs | |
| Publication status | Published - 13 Sep 2018 |
Bibliographical note
Copyright © and Moral Rights are retained by the author(s) and/ or othercopyright owners. A copy can be downloaded for personal non-commercial
research or study, without prior permission or charge. This item cannot be
reproduced or quoted extensively from without first obtaining permission in
writing from the copyright holder(s). The content must not be changed in any way
or sold commercially in any format or medium without the formal permission of
the copyright holders.
Keywords
- Renewable hydrogen
- Ammonia synthesis
- Catalysis
- Proton conductor
- Nickel catalyst
- Catalyst promoter
