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Activated carbon as a template for creating catalyst precursors. Unsupported cobalt catalyst for ammonia synthesis

Paper ID Volume ID Publish Year Pages File Format Full-Text
52270 46867 2008 4 PDF Available
Title
Activated carbon as a template for creating catalyst precursors. Unsupported cobalt catalyst for ammonia synthesis
Abstract

Unsupported cobalt catalysts promoted with barium (symbol Co + Ba), cerium (Co + Ce) or both (Co + Ce + Ba) were synthesized and tested in ammonia synthesis at 63 bar. The Ba-free Co and Co+Ce oxide forms of the catalysts were prepared by the templating route, using commercial activated carbon (GF45; Norit) preheated in hydrogen (800 °C) as the template and cobalt and cerium nitrates as the active phase precursor and the promoter precursor, respectively. Barium was introduced to the Co and Co + Ce powders by their impregnation with an aqueous solution of barium nitrite. The kinetic studies of NH3 synthesis have demonstrated that the doubly-promoted material (Co + Ce + Ba) is about 2.5 times more active than the system doped with barium and about 20 times as active as that with Ce. At 400 °C and at high conversion (8% NH3), the ammonia synthesis rate over Co + Ce + Ba proved to be almost twice as high as that obtained for the commercial iron catalyst (KM I, H. Topsoe) used commonly in ammonia plants all over the world.

Keywords
Ammonia synthesis; Cobalt catalyst; Carbon template; Barium and cerium promoters
First Page Preview
Activated carbon as a template for creating catalyst precursors. Unsupported cobalt catalyst for ammonia synthesis
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 9, Issue 5, 20 March 2008, Pages 870–873
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis