Decomposition of NO over Cu-AITS-1 zeolites

Z. Schay, L. Guczi, Zs Koppány, I. Nagy, A. Beck, V. Samuel, M. K. Dongare, D. P. Sabde, S. G. Hegde, A. V. Ramaswamy

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9 Citations (Scopus)

Abstract

H-AITS-1 zeolite with Si/Ti = 50 and Si/Al = 50 was employed in preparing catalyst samples by ion-exchange and impregnation with a copper nitrate solution to obtain 0.24-1.15 wt.% and 1.5, 2 and 2.5 wt.% Cu loading, respectively. The catalytic properties for the NO decomposition were compared with that of Cu-ZSM-5 (Si/Al = 25 with 2 wt.% Cu loading) and similarity was found between the AITS-1 based samples and Cu-ZSM-5. Due to the higher acidity, the activity at 500°C per total copper atoms (an apparent turnover frequency, TOF) was significantly higher over Cu based AITS-1 samples being 2-3 × 10-3 s-1 as compared to 1 × 10-3 s-1 measured on Cu-ZSM-5. For the ion-exchanged Cu-AITS-1 there was an increase in TOF with increasing copper content, whereas on the impregnated samples a decrease in TOF was found. On all catalysts there was a maximum in the NO conversion at 500-550°C. The amount of NO per copper atom measured by temperature programmed desorption (TPD) was about the same as that on Cu-ZSM-5 and the features of the TPD were also similar. At the first contact of the catalyst at 500°C with the 2 vol% NO/Ar gas a transient N2O formation and a considerable delay in the O2 formation was observed. This could, however, be reproduced only on fresh catalyst, while all further transients showed different but reproducible features using the same sample.

Original languageEnglish
Pages (from-to)569-574
Number of pages6
JournalCatalysis Today
Volume54
Issue number4
DOIs
Publication statusPublished - Dec 17 1999
EventProceedings of the 1998 2nd World Congress on Environmental Catalysis 'Environmental Catalysis - Fundamental and Applied NOx Control Studies' - Miami, FL, United States
Duration: Nov 15 1998Nov 20 1998

Keywords

  • AITS
  • TOF
  • Zeolites

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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    Schay, Z., Guczi, L., Koppány, Z., Nagy, I., Beck, A., Samuel, V., Dongare, M. K., Sabde, D. P., Hegde, S. G., & Ramaswamy, A. V. (1999). Decomposition of NO over Cu-AITS-1 zeolites. Catalysis Today, 54(4), 569-574. https://doi.org/10.1016/S0920-5861(99)00219-9