Thermostable molecular sieves, silicoaluminophosphate (SAPO)-34, for the removal of NOx with C{sub 3}H{sub 6} in the coexistence of O{sub 2}, H{sub 2}O, and SO{sub 2}

Journal Article · Wed Jan 01 04:00:00 EST 1997 · Industrial and Engineering Chemistry Research

DOI:https://doi.org/10.1021/ie960389s· OSTI ID:438936

Ishihara, Tatsumi; Kagawa, Masaru; Hadama, Fumiaki; Nishiguchi, Hiroyasu; Ito, Masami; Takita, Yusaku ^[1]

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1. Oita Univ. (Japan)

Selective reduction of NO with C{sub 3}H{sub 6} 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 C{sub 3}H{sub 6} in a large excess of O{sub 2}; 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 % H{sub 2}O. After thermal treatment at 1,073 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 SO{sub 2}, it is expected that the activity of Cu-SAPO-34 is sustained over a long period.

• OSTI ID: 438936
• Journal Information: Industrial and Engineering Chemistry Research, Journal Name: Industrial and Engineering Chemistry Research Journal Issue: 1 Vol. 36; ISSN IECRED; ISSN 0888-5885
• Country of Publication: United States
• Language: English

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54 ENVIRONMENTAL SCIENCES
AIR POLLUTION CONTROL
CATALYTIC EFFECTS
EXPERIMENTAL DATA
INTERNAL COMBUSTION ENGINES
MOLECULAR SIEVES
NITRIC OXIDE
PROPYLENE
SELECTIVE CATALYTIC REDUCTION
SULFUR DIOXIDE
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