Promotion effect of proton-conducting oxide BaZr0.1Ce0.7Y0.2O3−δ on the catalytic activity of Ni towards ammonia synthesis from hydrogen and nitrogen
| Autor: | John Humphreys, Rong Lan, Dongwei Du, Shanwen Tao, Wei Xu |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Proton Hydrogen Renewable Energy Sustainability and the Environment Inorganic chemistry Oxide Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Nitrogen 0104 chemical sciences Catalysis Ammonia production chemistry.chemical_compound Fuel Technology chemistry Specific activity QD 0210 nano-technology Proton conductor |
| ISSN: | 0360-3199 |
| Popis: | 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 MgO CeO2. These promotion effects were suspected to be due to the proton conducting nature of the support. Therefore it is proposed that the use of proton conducting support materials with highly active ammonia synthesis catalysts such as Ru and Fe will provide improved activity of at lower temperatures. |
| Databáze: | OpenAIRE |
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