Ozone decomposition on Ag/SiO2 and Ag/clinoptilolite catalysts at ambient temperature

Penko Nikolov*, Krassimir Genov, Petya Konova, Katya Milenova, Todor Batakliev, Vladimir Georgiev, Narendra Kumar, Dipak K. Sarker, Dimitar Pishev, Slavcho Rakovsky

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

41 Citations (Scopus)

Abstract

Silver modified zeolite (Bulgarian natural clinoptilolite) and Ag/silica catalysts were synthesized by ion exchange and incipient wet impregnation method respectively and characterized by different techniques. DC arc-AES was used for Ag detection. XRD spectra show that Ag is loaded over the surface of the SiO2 sample and that after the ion-exchange process the HEU type structure of clinoptilolite is retained. UV-VIS (specific reflection at 310nm) and IR (band at 695cm-1) spectroscopy analysis proved that silver is loaded as a T-atom into zeolite channels as Ag+, instead of Na+, Ca2+, or K+ ions, existing in the natural clinoptilolite form. The samples Ag/SiO2 and Ag-clinoptilolite were tested as catalysts for decomposition of gas phase ozone. Very high catalytic activity (up to 99%) was observed and at the same time the catalysts remained active over time at room temperature.

Original languageEnglish
Pages (from-to)16-19
Number of pages4
JournalJournal of Hazardous Materials
Volume184
Issue number1-3
DOIs
Publication statusPublished - 2010
MoE publication typeA1 Journal article-refereed

Keywords

  • Ag/SiO
  • HEU
  • Ozone decomposition
  • Silver exchange
  • Waste gases
  • Zeolite clinoptilolite

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