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

Nikolov, P.; Genov, Krassimir; Konova, P.; Milenova, Katya; Batakliev, Todor; Georgiev, Vasil; Kumar, Narendra; Sarker, Dipak K.; Pishev, D. I.; Rakovsky, Slavcho

doi:10.1016/j.jhazmat.2010.07.056

Cited by 64 publications

(22 citation statements)

References 12 publications

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“…Recently, some studies reported the interest of using microporous zeolites as supports for metal oxide catalysts . However, there is very little information on the decomposition of gaseous ozone by pure zeolites without any metal oxide deposit.…”

Section: Introductionmentioning

confidence: 99%

Gaseous ozone decomposition over high silica zeolitic frameworks

et al. 2018

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For several decades, it has been known that ozone emissions are harmful to humans, plants, and animals. Heterogeneous catalytic decomposition is an efficient process for removing ozone from air. This study examines the effect of the zeolite's framework and pore width on efficiency for decomposing gaseous ozone. Four highly hydrophobic zeolites are used: a large cavity zeolite (Faujasite/H-FAU), a medium pore zeolite with parallel channel (Mordenite/H-MOR), and two medium pore zeolites with interconnected channels (H-ZSM-5/H-MFI and Na-ZSM-5/Na-MFI). Experiments were conducted in fixed-bed flow reactors loaded with zeolite at ambient conditions (20 8C and 101 kPa). Zeolite surfaces were analyzed during the experiments in order to understand the influence of physical and chemical surface properties on the ozone decomposition mechanism. A higher amount of ozone is eliminated using H-MOR, compared with the zeolite samples H-FAU, H-MFI, and Na-MFI. Pore width and micropore framework size distribution (channel and cages) appear to be key factors. A narrow channel or cage, slightly larger than the ozone molecule size, seems to promote ozone interactions with Lewis acid sites. Fourier transform infrared spectroscopy shows that Lewis acid sites (LAS), located on the walls of zeolite pores, decompose ozone. This leads to the formation of atomic oxygen species that could react with another ozone molecule to form dioxygen. Hence, LAS are regenerated, ready to decompose another ozone molecule once more.

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Section: Introductionmentioning

confidence: 99%

Gaseous ozone decomposition over high silica zeolitic frameworks

et al. 2018

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“…For instance, Ni 2+ /CLI is applied for sulphur removal from fuel oil [18], Ag + /CLI [20], Cu 2+ (Zn 2+ , Mn 2+ )/CLI [21], Mn 2+ (Co 2+ , Cu 2+ )/CLI [22, 23] are used for ozone decomposition, K 2 PdCl 4 –Cu(NO 3 ) 2 –KBr/H-CLI and CuCl 2 /CLI are proposed by us for the oxidation of carbon monoxide [4–6, 24] and sulfur dioxide [25], respectively.…”

Section: Backgoundmentioning

confidence: 99%

Acid-modified clinoptilolite as a support for palladium–copper complexes catalyzing carbon monoxide oxidation with air oxygen

Rakitskaya

Kiose

Golubchik

et al. 2017

Chemistry Central Journal

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Samples of natural clinoptilolite were modified by an acid–thermal method at nitric acid concentrations of 0.25, 0.5, 1.0, and 3.0 M and a contact time of 30 min. A series of catalysts, K2PdCl4–Cu(NO3)2–KBr/S (S = 0.25H-CLI, 0.5H-CLI, 1H-CLI, and 3H-CLI) was obtained. All samples were investigated by X-ray phase and thermogravimetric analysis, FT-IR spectroscopy, water vapor ad/desorption and pH metric method. Besides, K2PdCl4–Cu(NO3)2–KBr/S samples were tested in the reaction of low-temperature carbon monoxide oxidation. It have been found that, owing to special physicochemical and structural-adsorption properties of 3H-CLI, it promotes formation of the palladium–copper catalyst providing carbon monoxide oxidation at the steady-state mode down to CO concentrations lower than its maximum permissible concentration at air relative humidity varied within a wide range.

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“…Catalytic decomposition has realized the catalytic removal of ozone at 25 C and has become the focus of current research because of its high decomposition efficiency, safety and economy. The active components of the catalyst mainly include noble metals [13][14][15] and transition metal oxides. [16][17][18][19] Imamura et al reported that p-type semiconductors have higher decomposition efficiency for ozone than n-type semiconductors.…”

Section: Introductionmentioning

confidence: 99%

Gram-scale synthesis of ultra-fine Cu₂O for highly efficient ozone decomposition

et al. 2020

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

Cited by 64 publications

References 12 publications

Gaseous ozone decomposition over high silica zeolitic frameworks

Gaseous ozone decomposition over high silica zeolitic frameworks

Acid-modified clinoptilolite as a support for palladium–copper complexes catalyzing carbon monoxide oxidation with air oxygen

Gram-scale synthesis of ultra-fine Cu₂O for highly efficient ozone decomposition

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

Cited by 64 publications

References 12 publications

Gaseous ozone decomposition over high silica zeolitic frameworks

Gaseous ozone decomposition over high silica zeolitic frameworks

Acid-modified clinoptilolite as a support for palladium–copper complexes catalyzing carbon monoxide oxidation with air oxygen

Gram-scale synthesis of ultra-fine Cu2O for highly efficient ozone decomposition

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Gram-scale synthesis of ultra-fine Cu₂O for highly efficient ozone decomposition