Nitric oxide reduction using co-impregnated rhodium on an alumina celcor honeycomb

Co-impregnation of an alumina honeycomb support with rhodium chloride and either hydrofluoric or citric acid produces a catalyst with the noble metal driven deep within the support. The outer layer of the catalyst which is bare alumina has the capability of reversibly adsorbing sulfur dioxide, while...

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Bibliographic Details
Published in:Chemical engineering science 1988, Vol.43 (8), p.2067-2072
Main Authors: Stenger, H.G., Meyer, E.C., Hepburn, J.S., Lyman, C.E.
Format: Article
Language:English
Subjects:
alumina honeycomb
Applied sciences
Atmospheric pollution
Exact sciences and technology
flue gas treatment
General processes of purification and dust removal
Nitric oxide reduction
Pollution
Prevention and purification methods
sulfur tolerance
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Summary:Co-impregnation of an alumina honeycomb support with rhodium chloride and either hydrofluoric or citric acid produces a catalyst with the noble metal driven deep within the support. The outer layer of the catalyst which is bare alumina has the capability of reversibly adsorbing sulfur dioxide, while allowing nitric oxide and hydrogen to penetrate to the noble metal layer where reduction of nitric oxide to nitrogen and water occurs. Thus the sulfur tolerance of the catalyst is increased. A model explaining the experimental observations is presented and solved, and shows that an increase in the sulfur tolerance can be acheived if the sulfur dioxide capacity of the outer sorbent layer can be increased.
ISSN:0009-2509
1873-4405
DOI:10.1016/0009-2509(88)87085-4