Carbon-supported cobalt catalyst for ammonia synthesis: Effect of preparation procedure |
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| Affiliation: | 1. WestCHEM, School of Chemistry, Joseph Black Building, University of Glasgow, Glasgow G12 8QQ, UK;2. University of Poitiers, CNRS UMR 7285 Institut de Chimie des Milieux et Matériaux de Poitiers (IC2MP), 4 rue Michel Brunet, TSA 51106, 86073 Poitiers Cedex 9, France;3. EaSTCHEM, School of Chemistry, Purdie Building, University of St Andrews, St Andrews, KY16 9ST, UK;1. Department of Integrated Science and Technology, Faculty of Science and Technology, Oita University, 700 Dannoharu, Oita 870-1154, Japan;2. Elements Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University, Katsura, Kyoto 615-8520, Japan;3. Division of Applied Chemistry, Faculty of Engineering, Hokkaido University, Sapporo 060-8628, Japan |
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| Abstract: | Supported cobalt catalysts were synthesised, characterised (by H2 TPD, XRD, TEM), and tested in ammonia synthesis at 9.0 MPa (400–470 °C; H2:N2 = 3:1). Partly graphitised carbon of high surface area (840 m2/g), cobalt nitrate, and barium nitrate were used as a support, a precursor of the active phase, and a promoter precursor, respectively. Both cobalt dispersion in the Ba-doped catalyst and, to a greater extent, catalytic properties of the promoted Co surfaces (TOF) proved to be dependent on the unpromoted material pretreatment (reduction in H2, subsequent calcination in air). The kinetic studies of NH3 synthesis have shown explicitly that Ba-promoted cobalt on carbon is very active and less inhibited by the ammonia product than the commercial magnetite-based material. |
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