期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 184, 期 1-3, 页码 16-19出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2010.07.056
关键词
Ozone decomposition; Ag/SiO2; Zeolite clinoptilolite; HEU; Silver exchange; Waste gases
资金
- UNION [DO-02-82/2008]
- NATO [CBP.EAP.RIG.981670]
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 310 nm) and IR (band at 695 cm(-1)) spectroscopy analysis proved that silver is loaded as a T-atom into zeolite channels as Ag+, instead of Ha(+), 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. (c) 2010 Elsevier B.V. All rights reserved.
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