Journal of the Chemical Society - Faraday Transactions p. 3275 - 3280 (1995)
Update date:2022-08-11
Topics:
Uddin, Md. Azhar
Komatsu, Takayuki
Yashima, Tatsuaki
The catalytic properties of framework Fe(3+) 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, occured 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 Fe(3+) ions in H-ferrisilicate are the active sites for the selective catalytic reduction of nitric oxide.
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