Selective catalytic reduction of nitric oxide with ammonia on MFI-type ferrisilicate

Azhar Uddin, Takayuki Komatsu, Tatsuaki Yashima

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

The catalytic properties of framework Fe3+ in MFI-type H-ferrisilicate for the selective reduction of nitric oxide with ammonia in the presence of oxygen have been investigated and compared with those of Fe-exchanged ZSM-5, iron oxide supported on silicalite and HZSM-5. H-ferrisilicate exhibited a high activity and selectivity for the reduction of nitric oxide into nitrogen. A side reaction, i.e. the oxidation of ammonia with oxygen into nitrogen, occurred only above 773 K. The activity and selectivity of Fe-exchanged ZSM-5 for the reduction of nitric oxide were comparable to those of H-ferrisilicate, while iron oxide supported on silicalite catalysed the oxidation of ammonia with oxygen into nitric oxide preferentially under the same reaction conditions. The catalytic activity of HZSM-5 for this reaction was much lower than that of H-ferrisilicate. Therefore, the framework Fe3+ ions in H-ferrisilicate are the active sites for the selective catalytic reduction of nitric oxide.

Original languageEnglish
Pages (from-to)3275-3279
Number of pages5
JournalJournal of the Chemical Society, Faraday Transactions
Volume91
Issue number18
DOIs
Publication statusPublished - 1995
Externally publishedYes

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Selective catalytic reduction
nitric oxide
Ammonia
ammonia
Nitric Oxide
Oxygen
iron oxides
oxygen
Nitrogen
selectivity
nitrogen
Oxidation
oxidation
catalytic activity
Catalyst activity
Ions
ions

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Selective catalytic reduction of nitric oxide with ammonia on MFI-type ferrisilicate. / Uddin, Azhar; Komatsu, Takayuki; Yashima, Tatsuaki.

In: Journal of the Chemical Society, Faraday Transactions, Vol. 91, No. 18, 1995, p. 3275-3279.

Research output: Contribution to journalArticle

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N2 - The catalytic properties of framework Fe3+ in MFI-type H-ferrisilicate for the selective reduction of nitric oxide with ammonia in the presence of oxygen have been investigated and compared with those of Fe-exchanged ZSM-5, iron oxide supported on silicalite and HZSM-5. H-ferrisilicate exhibited a high activity and selectivity for the reduction of nitric oxide into nitrogen. A side reaction, i.e. the oxidation of ammonia with oxygen into nitrogen, occurred only above 773 K. The activity and selectivity of Fe-exchanged ZSM-5 for the reduction of nitric oxide were comparable to those of H-ferrisilicate, while iron oxide supported on silicalite catalysed the oxidation of ammonia with oxygen into nitric oxide preferentially under the same reaction conditions. The catalytic activity of HZSM-5 for this reaction was much lower than that of H-ferrisilicate. Therefore, the framework Fe3+ ions in H-ferrisilicate are the active sites for the selective catalytic reduction of nitric oxide.

AB - The catalytic properties of framework Fe3+ in MFI-type H-ferrisilicate for the selective reduction of nitric oxide with ammonia in the presence of oxygen have been investigated and compared with those of Fe-exchanged ZSM-5, iron oxide supported on silicalite and HZSM-5. H-ferrisilicate exhibited a high activity and selectivity for the reduction of nitric oxide into nitrogen. A side reaction, i.e. the oxidation of ammonia with oxygen into nitrogen, occurred only above 773 K. The activity and selectivity of Fe-exchanged ZSM-5 for the reduction of nitric oxide were comparable to those of H-ferrisilicate, while iron oxide supported on silicalite catalysed the oxidation of ammonia with oxygen into nitric oxide preferentially under the same reaction conditions. The catalytic activity of HZSM-5 for this reaction was much lower than that of H-ferrisilicate. Therefore, the framework Fe3+ ions in H-ferrisilicate are the active sites for the selective catalytic reduction of nitric oxide.

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