期刊
POLISH JOURNAL OF CHEMICAL TECHNOLOGY
卷 17, 期 1, 页码 138-143出版社
DE GRUYTER OPEN LTD
DOI: 10.1515/pjct-2015-0020
关键词
ammonia synthesis; cobalt catalyst; promoter; lanthanum; co-precipitation
资金
- National Centre for Research and Development within The Applied Research Programme [PBS2/A1/13/2014]
In modern research on catalysts for NH3 synthesis a lot of attention is paid to cobalt. In this work the new catalytic systems based on cobalt are presented. Unsupported cobalt catalysts singly promoted (La or Ba) and doubly promoted (La and Ba) were prepared and tested in NH3 synthesis reaction under commercial synthesis conditions. Characterization studies revealed that lanthanum plays a role of a structural promoter, which improves the surface of catalyst precursors and prevents from sintering during calcination. However, lanthanum has a negative effect on the reduction of cobalt oxide, but the addition of barium promoter (Co/La/Ba catalyst) diminishes the negative impact of La. The co-promotion of cobalt with lanthanum and barium results in the increasing of the active phase surface and improvement of its activity in NH3 synthesis.
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