Storage models for ammonia synthesis over iron catalyst under periodic operation

Two models of possible nitrogen storage mechanisms in an iron catalyst during cycling of ammonia synthesis are examined. A surface storage model assumes two kinds of nitrogen adsorption sites on the catalyst surface. It is also assumed that chemical reaction can take place during the surface diffusi...

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Bibliographic Details
Published inChemical engineering science Vol. 45; no. 10; pp. 3111 - 3121
Main Authors Nam, Y.W., Hudgins, R.R., Silveston, P.L.
Format Journal Article
LanguageEnglish
Published Oxford Elsevier Ltd 1990
Elsevier
Subjects
Applied sciences
Chemical industry and chemicals
Exact sciences and technology
Industrial chemicals
Inorganic industry
Ammonia
Chemisorption
Chemical industry
Periodic behavior
Hydrogen
Iron
Manufacturing
Nitrogen
Dynamic model
Modeling
Catalyst
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Summary:Two models of possible nitrogen storage mechanisms in an iron catalyst during cycling of ammonia synthesis are examined. A surface storage model assumes two kinds of nitrogen adsorption sites on the catalyst surface. It is also assumed that chemical reaction can take place during the surface diffusion of nitrogen atoms between these sites. A bulk dissolution model also assumes dual nitrogen sites. With a well-mixed gas phase, it is shown that the surface storage model and bulk dissolution model can predict enhancement of the time-average production rate of ammonia over the optimal steady-state rate as well as resonance behaviour.
ISSN:0009-2509
1873-4405
DOI:10.1016/0009-2509(90)80057-L