ISSN:
1572-879X
Keywords:
NO decomposition
;
surface Cu and ion-exchanged Cu
;
pH effects
;
STEM analysis of Cu-ZSM-5
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract Effects of Cu-ZSM-5 catalyst preparation on the activity of “over-exchanged” copper for NO decomposition are reported. The Cu-ZSM-5 catalysts were prepared by incorporating Cu2+ cations into ZSM-5 zeolites from an aqueous cupric acetate solution adjusted to different pH values by adding either acetic anhydride or aqueous ammonia in the solution. The Cu2+ exchange levels increased with increasing pH level. STEM/EDX analysis identified CuO particles (5–6 nm) on the zeolite surface for the materials exchanged at pH〉6. Conversion and kinetics measurements of NO decomposition to N2 over these catalysts showed that the “over-exchanged” copper was not active. Short-time wash with aqueous ammonia removed this copper. The catalyst activity correlated very well with the amount of copper remaining in the ZSM-5 channels.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00817035
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