Ozone decomposition on Ag/SiO2 and Ag/clinoptilolite catalysts at ambient temperature.
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 SiO(2) 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 Na(+), Ca(2+), or K(+) ions, existing in the natural clinoptilolite form. The samples Ag/SiO(2) 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.
Nikolov
Penko
P
Institute of Catalysis, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria. Electronic address: penmail@mail.bg.
Genov
Krassimir
K
Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria.
Konova
Petya
P
Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria.
Milenova
Katya
K
Institute of Catalysis, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria.
Batakliev
Todor
T
Institute of Catalysis, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria.
Georgiev
Vladimir
V
Institute of Catalysis, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria.
Kumar
Narendra
N
Laboratory of Industrial Chemistry, Process Chemistry Centre, Åbo Akademi University, Biskopsgatan 8, 20500 Åbo/Turku, Finland.
Sarker
Dipak K
DK
School of Pharmacy and Biomolecular Sciences, University of Brighton, Lewes Road, Brighton BN2 4GJ, UK.
Pishev
Dimitar
D
University of Chemical Technology and Metallurgy, 1756 Sofia, Bulgaria.
Rakovsky
Slavcho
S
Institute of Catalysis, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria.
D002384:Catalysis; D010126:Ozone / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*; D013696:Temperature; D017641:Zeolites / Q000737:chemistry*
C083175:clinoptilolite; D017641:Zeolites; D012834:Silver; D010126:Ozone; D012822:Silicon Dioxide