Thermostable Molecular Sieves, Silicoaluminophosphate (SAPO)-34, for the Removal of NOX with C3H6 in the Coexistence of O2, H2O, and SO2

Tatsumi Ishihara, Masaru Kagawa, Fumiaki Hadama, Hiroyasu Nishiguchi, Masami Ito, Yusaku Takita

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13 Citations (Scopus)


Selective reduction of NO with C3H6 under an oxidizing atmosphere was studied over various Cu ion-exchanged molecular sieves. All examined Cu ion-exchanged catalysts are active for NO reduction with C3H6 in a large excess of O2; however, the temperature at the maximum NO conversion depends on the kind of molecular sieves. In particular, it was found that Cu-SAPO-34 is sometimes more active than Cu-ZSM-5. Thermal stability of SAPO-34 was extremely high, and consequently, decrease in the activity to NO selective reduction on Cu-SAPO-34 was negligible over 60 h at 673 K in an atmosphere containing 15 vol % H2O. After thermal treatment at 1073 K in a humidified atmosphere, decrease in the activity to NO reduction was also small. Although the activity of Cu-SAPO-34 to NO reduction was decreased slightly with the coexistence of SO2, it is expected that the activity of Cu-SAPO-34 is sustained over a long period.

Original languageEnglish
Pages (from-to)17-22
Number of pages6
JournalIndustrial and Engineering Chemistry Research
Issue number1
Publication statusPublished - Jan 1997
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering


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