Abstract
Supported cobalt catalysts were synthesised, characterised (by H 2 TPD, XRD, TEM), and tested in ammonia synthesis at 9.0 MPa (400–470 °C; H 2:N 2 = 3:1). Partly graphitised carbon of high surface area (840 m 2/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 H 2, subsequent calcination in air). The kinetic studies of NH 3 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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