Chemical and Catalytic Properties of Ozone

Oyama, S. Ted

doi:10.1081/cr-100100263

Cited by 310 publications

(214 citation statements)

References 169 publications

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“…5 presents DRIFTS spectra of Z-78, the most reactive ZSM-5 toward ozone. DRIFTS spectra were recorded in the absence of ozone (t = 0 min) and after different times of ozone exposure (3,15,26 and 32 min). The main bands are observed in following ranges: 780-820 cm À1 , 1040-1060 cm À1 , 1080 cm À1 , 1140 cm À1 and 1390 cm À1 .…”

Section: 2mentioning

confidence: 99%

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Role of Lewis acid sites of ZSM-5 zeolite on gaseous ozone abatement

Brodu

Manero

Andriantsiferana

et al. 2013

Chemical Engineering Journal

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in : http://oatao.univ-toulouse.fr/ Eprints ID : 9735 We report the role played by acidic surface sites of ZSM-5 on ozone removal. Ozone removal is mainly due to ozone decomposition on mild/strong Lewis acid sites. Adsorbed oxygen species appear on ZSM-5 surface because of ozone decomposition. Keywords:Acidic sites Chemical surface properties Lewis acid sites Ozone Synthetic zeolites ZSM-5 zeolite a b s t r a c t In this work, chemical interactions between ozone and zeolite surface active sites are studied in order to propose a process for gaseous ozone removal. Synthetic ZSM-5 zeolites with three different Si/Al 2 ratios and similar specific surface areas and microporous volumes were used in this study. Zeolite samples were characterised using Fourier Transform InfraRed spectroscopy (FTIR) and pyridine sorption IR studies in order to determine acidic site concentrations and strength. Ozone removal experiments were conducted in a quartz fixed-bed flow reactor, at 20°C and 101 kPa. Experiments using Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS) were conducted in order to identify adsorbed ozone and/or adsorbed oxygen species on zeolite surface. Pyridine IR measurements evidence two kinds of Lewis acid sites induced by extra-framework aluminium species and electronic aluminium defaults inside zeolite structure. Results obtained here evidence the important role of acidic surface sites of ZSM-5 zeolite on gaseous ozone removal. The total amount of removed ozone is found to be directly proportional to the total content of Lewis acid sites. DRIFTS experiments exhibit two bands around 800 and 1400 cm À1 that could correspond to adsorbed oxygen species linked to zeolite surface. DRIFTS experiments also exhibit a band around 1100 cm À1 that correspond to adsorbed ozone on the zeolite surface. Gaseous ozone removal using ZSM-5 zeolite could be largely attributed to ozone decomposition on Lewis acid sites and also to ozone adsorption on the surface of the zeolites.

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Section: 2mentioning

confidence: 99%

“…As well as being responsible of the urban smog in large cities, ozone is a pollutant involved in indoor air contamination. In working environments, the use of photocopiers, laser printers, fax machines cause ozone formation [3]. In water industry, ozone is applied for water disinfection and also for the oxidation of organic matter.…”

Section: Introductionmentioning

confidence: 99%

Role of Lewis acid sites of ZSM-5 zeolite on gaseous ozone abatement

Brodu

Manero

Andriantsiferana

et al. 2013

Chemical Engineering Journal

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“…2 b) [21] and the highest oxidation level of chromium, Cr(VI), does not permit its participation in the reaction with ozone. The equilibrium pH value for the SCWA-TsL-11 aqueous suspension equal to 8.55 also contributes to the reaction of ozone decomposition because alkali or subalkali media promote the reaction [23].…”

Section: Resultsmentioning

confidence: 99%

“…After contacting a SCWA-TsL-11 sample with water for 20 min, pH of this aqueous suspension decreases from 8.85 to 8.55 and does not change after that. A negative value of Taking into account the chemical and phase compositions of SCWA-TsL-11 and according to what is known about ozone decomposition reactions over both oxide catalysts [21] and atmospheric mineral aerosols [22], it can be concluded that the detected phases of manganochromite as well as oxides of iron, chromium, nickel, and manganese are the most probable catalysts of ozone decomposition. Among them, the highest catalytic activity in respect to the reaction under study is characteristic of manganese, nickel, and iron oxides [21].…”

Section: Resultsmentioning

confidence: 99%

Physicochemical and Catalytic Properties of the Solid Component of Welding Aerosol

Rakitskaya¹,

Еннан²,

Truba³

et al. 2015

Him. Fiz. Tehnol. Poverhni

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“…Such can be the tracers' surface adsorption, (catalytic) decomposition of O 3 and its reaction with organics or with surface carbon that also may lead to the production of CO (Oyama, 2000). Evidence exists for the dissociative adsorption of O 3 on the surfaces with subsequent production of the reactive atomic oxygen species (see, e.g.…”

Section: Estimate Of δ 18 O(o 3 )mentioning

confidence: 99%

An estimation of the <sup>18</sup>O / <sup>16</sup>O ratio of UT/LMS ozone based on artefact CO in air sampled during CARIBIC flights

Gromov

Brenninkmeijer

2015

Atmos. Chem. Phys.

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Abstract. An issue of O 3 -driven artefact production of O 3 in the upper troposphere/lowermost stratosphere (UT/LMS) air analysed in the CARIBIC-1 project is being discussed. By confronting the CO mixing and isotope ratios obtained from different analytical instrumentation, we (i) reject natural/artificial sampling and mixing effects as possible culprits of the problem, (ii) ascertain the chemical nature and quantify the strength of the contamination, and (iii) demonstrate successful application of the isotope mass-balance calculations for inferring the isotope composition of the contamination source. The δ 18 O values of the latter indicate that the oxygen is very likely being inherited from O 3 . The δ 13 C values hint at reactions of trace amounts of organics with stratospheric O 3 that could have yielded the artificial CO. While the exact contamination mechanism is not known, it is clear that the issue pertains only to the earlier (first) phase of the CARIBIC (Civil Aircraft for the Regular Investigation of the atmosphere Based on an Instrument Container) project. Finally, estimated UT/LMS ozone δ 18 O values are lower than those observed in the stratosphere within the same temperature range, suggesting that higher pressures (240-270 hPa) imply lower isotope fractionation controlling the local δ 18 O(O 3 ) value.

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Chemical and Catalytic Properties of Ozone

Cited by 310 publications

References 169 publications

Role of Lewis acid sites of ZSM-5 zeolite on gaseous ozone abatement

Role of Lewis acid sites of ZSM-5 zeolite on gaseous ozone abatement

Physicochemical and Catalytic Properties of the Solid Component of Welding Aerosol

An estimation of the <sup>18</sup>O / <sup>16</sup>O ratio of UT/LMS ozone based on artefact CO in air sampled during CARIBIC flights

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Chemical and Catalytic Properties of Ozone

Cited by 310 publications

References 169 publications

Role of Lewis acid sites of ZSM-5 zeolite on gaseous ozone abatement

Role of Lewis acid sites of ZSM-5 zeolite on gaseous ozone abatement

Physicochemical and Catalytic Properties of the Solid Component of Welding Aerosol

An estimation of the &lt;sup&gt;18&lt;/sup&gt;O / &lt;sup&gt;16&lt;/sup&gt;O ratio of UT/LMS ozone based on artefact CO in air sampled during CARIBIC flights

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An estimation of the <sup>18</sup>O / <sup>16</sup>O ratio of UT/LMS ozone based on artefact CO in air sampled during CARIBIC flights