Selective reduction of NO over cobalt phosphate catalyst with C3H6 or CH4

M. Kagawa, H. Nishiguchi, T. Ishihara, Y. Takita

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Abstract

A study of the activity of metal phosphate catalyst in selective reduction of NO with propene showed that Co3(PO4)2 and GaPO4 exhibited high catalytic activities, with the former catalyst exhibiting the highest activity. The selective reduction of NO hardly proceeded when methane was used as reductant. However, the loading of Pt on Co3(PO4)2 was found to be effective for enhancing the activity in this reaction. TPD techniques were used to further study the reaction mechanism in NO reduction over Co3(PO4)2 catalyst. NO-TPD and NO direct decomposition results suggested that N2 was formed by the dissociative adsorption of NO which is the initial reaction step in NO reduction, however, the adsorption of oxygen on this catalyst was very strong to desorb. Propene as a reductant was considered effective in removing surface oxygen formed by NO decomposition. This study revealed that Co3(PO4)2 is highly active and selective in NO reduction with hydrocarbon in the presence of oxygen. Co3(PO4)2 shows potential as a thermostable de-NOx catalyst for lean combustion engines as its thermal stability is sufficient to meet practical applications.

Original languageEnglish
Pages (from-to)258-265
Number of pages8
JournalSekiyu Gakkaishi (Journal of the Japan Petroleum Institute)
Volume42
Issue number4
DOIs
Publication statusPublished - Jul 1999
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Fuel Technology
  • Energy Engineering and Power Technology

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