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Journal Articles

Catalytic effect of Pt and Ag-loaded -Al $_{2}$ O $_{3}$ on the oxidation of xylene in air at low temperature under electron-beam irradiation

Hakoda, Teruyuki; Matsumoto, Kanae*; Mizuno, Akira*; Hirota, Koichi

International Journal of Plasma Environmental Science & Technology, 4(1), p.65 - 70, 2010/03

http://www.iesj.org/html/service/ijpest/vol4_no1_2010/IJPEST_Vol4_No1_10_pp065-070.pdf

The catalytic effect of Pt/Al $_{2}$ O $_{3}$ and Ag/Al $_{2}$ O $_{3}$ on the oxidation of xylene in air was studied at a constant temperature of 373 K, when they were combined with electron-beam (EB)-induced non-thermal plasmas (NTPs). The presence of a catalyst bed was found to enhance the oxidation of the irradiation products of xylene. However, the degree of catalytic oxidation was different depending on the type of loaded metal and the position of the catalyst bed. Compared with a Al $_{2}$ O $_{3}$ bed, a Pt/Al $_{2}$ O $_{3}$ bed in the NTP space suppressed oxidation, while an Ag/Al $_{2}$ O $_{3}$ bed downstream of the NTP space enhanced it. Under low temperature conditions, Pt/Al $_{2}$ O $_{3}$ was not a suitable catalyst for the oxidation of organics in combination with the NTP process. On the other hand, the Ag/Al $_{2}$ O $_{3}$ catalyst was a preferable catalyst for the NTP-induced oxidation of organics under such low temperature conditions.

Journal Articles

Role of metals loaded on a TiO $_{2}$ Surface in the oxidation of xylene in air using an electron beam irradiation/catalytic process

Hakoda, Teruyuki; Matsumoto, Kanae*; Mizuno, Akira*; Hirota, Koichi

Applied Catalysis A; General, 357(2), p.244 - 249, 2009/04

https://doi.org/10.1016/j.apcata.2009.01.030

Times Cited Count：16 Percentile：36.94(Chemistry, Physical)

Catalytic oxidation of xylene in air was performed under electron beam (EB) irradiation using pure TiO $_{2}$ as well as TiO $_{2}$ loaded with Ag, Pt, Au, and Mn to clarify the role of loaded metal in the enhancement of oxidation of xylene and its irradiation byproducts to CO $_{2}$ in EB-induced non-thermal plasma. EB irradiation experiments were performed with the catalyst bed placed in both irradiated and non-irradiated spaces. The highest conversion percentage of decomposed xylene to CO $_{2}$ was obtained by irradiation/catalytic oxidation using an Ag/TiO $_{2}$ bed placed in a non-irradiated space. The greater enhancement of CO $_{2}$ production on an Ag/TiO $_{2}$ pellet surface compared to that on other metal-loaded TiO $_{2}$ pellet surfaces was due to the synergetic effect of strong adsorption of the byproducts on the Ag loaded on TiO $_{2}$ and production of active oxygen from decomposition of O $_{3}$ in the presence of Ag.

Journal Articles

Deatermination of the number of OH radicals in EB-irradiated humid gases using oxidation of CO

Hakoda, Teruyuki; Shimada, Akihiko; Matsumoto, Kanae*; Hirota, Koichi

Plasma Chemistry and Plasma Processing, 29(1), p.69 - 78, 2009/02

https://doi.org/10.1007/s11090-008-9162-y

Times Cited Count：6 Percentile：26.27(Engineering, Chemical)

Electron beam (EB) technology has an advantage for treating dilute environmental pollutants in gases due to high-density population of active species such as radicals and atoms. In general, OH radicals play an important role of initiating the decomposition and removal of such pollutants. It is quite important to understand the behavior of OH radical production for the development of efficient decomposition/removal processes and the comparison with other purification methods. The number of OH radicals produced in humid N $_{2}$ at doses of 2.0-10.0 kGy with dose rates of 0.17-2.55 kGy/s under 1-MeV EB irradiation was indirectly determined using an index of oxidation of CO to CO $_{2}$ , which has been used in atmospheric chemistry. An experiment under conditions where all OH radicals produced react with CO demonstrated that the concentration of CO $_{2}$ increased linearly with doses of 0-10 kGy, and the (OH) was estimated as 4.90.

Journal Articles

Oxidation process of xylene in air using Ag/TiO $_{2}$ under electron beam irradiation

Hakoda, Teruyuki; Matsumoto, Kanae; Mizuno, Akira*; Narita, Tadashi*; Kojima, Takuji; Hirota, Koichi

IEEE Transactions on Industry Applications, 44(6), p.1950 - 1956, 2008/11

https://doi.org/10.1109/TIA.2008.2006328

Times Cited Count：3 Percentile：33.61(Engineering, Multidisciplinary)

Oxidation of xylene and its irradiation-induced organic byproducts in air using Ag-loaded TiO $_{2}$ (Ag/TiO $_{2}$ ) beds was studied under electron beam (EB) irradiation. The Ag/TiO $_{2}$ beds were placed in an irradiation or a non-irradiation space in order to identify the oxidation of xylene/its byproducts by EB irradiation, by catalytic process, and by a combination of the two. Placement of the Ag/TiO $_{2}$ bed to the irradiation space resulted in the suppression of xylene decomposition. On the other hand, production of CO $_{2}$ was observed in the gas phase of the irradiation space and on the surface of the Ag/TiO $_{2}$ pellets placed both in the irradiation and non-irradiation spaces. The concentration of CO $_{2}$ became higher when the layer was placed in the non-irradiation space. The production of CO $_{2}$ was enhanced by loading of Ag to the TiO $_{2}$ pellet surface. The highest concentration of CO $_{2}$ was obtained for Ag/TiO $_{2}$ with Ag contents greater than 5wt%.

Journal Articles

Oxidation of xylene and its irradiation byproducts using an electron-beam irradiating a -Al $_{2}$ O $_{3}$ bed

Hakoda, Teruyuki; Matsumoto, Kanae*; Mizuno, Akira*; Hirota, Koichi

Journal of Physics D; Applied Physics, 41(15), p.155202_1 - 155202_7, 2008/08

https://doi.org/10.1088/0022-3727/41/15/155202

Times Cited Count：3 Percentile：14.12(Physics, Applied)

The oxidation of xylene and its irradiation byproducts in air using a -Al $_{2}$ O $_{3}$ bed was studied under electron-beam irradiation to enhance the decomposition of volatile organic compounds in ventilation gases emitted from paint factories. The use of the -Al $_{2}$ O $_{3}$ bed enhanced the oxidation of the irradiation byproducts to CO $_{2}$ . Furthermore, the oxidation of the byproducts was accelerated by the placement of the -Al $_{2}$ O $_{3}$ bed in an irradiation space, because of the interaction of primary electrons with the surface of -Al $_{2}$ O $_{3}$ pellets. This combined oxidation process enabled a reduction in the energy consumption for non-toxic CO $_{2}$ formation, and improved the selectivity of CO $_{2}$ production.

Journal Articles

Application of ozone decomposition catalysts to electron-beam irradiated xylene/air mixtures for enhancing carbon dioxide production

Hakoda, Teruyuki; Matsumoto, Kanae; Shimada, Akihiko; Narita, Tadashi*; Kojima, Takuji; Hirota, Koichi

Radiation Physics and Chemistry, 77(5), p.585 - 590, 2008/05

https://doi.org/10.1016/j.radphyschem.2007.09.008

Times Cited Count：9 Percentile：51.54(Chemistry, Physical)

The electron beam (EB) oxidation of gaseous xylene in air, appearing as ventilation gases emitted from painting factories, was investigated under various experimental conditions. Thereby the implementation of an ozone decomposition catalyst, MnO $_{2}$ , into EB-induced oxidation of xylene/air mixtures strongly contributed in the achievement of a better purification degree.

Journal Articles

Catalytic oxidation of xylene in air using TiO $_{2}$ under electron beam irradiation

Hakoda, Teruyuki; Matsumoto, Kanae; Mizuno, Akira*; Kojima, Takuji; Hirota, Koichi

Plasma Chemistry and Plasma Processing, 28(1), p.25 - 37, 2008/02

https://doi.org/10.1007/s11090-007-9114-y

Times Cited Count：22 Percentile：62.64(Engineering, Chemical)

The oxidation of xylene and its irradiation byproducts in air using TiO $_{2}$ was studied under electron beam (EB) irradiation for the purification of ventilation gases emitted from paint factories. EB irradiation experiments were performed mainly under two different conditions: a TiO $_{2}$ pellet layer was placed in an irradiation or non-irradiation space. The results revealed that xylene was decomposed and CO was formed in the gas phase of the irradiation space irrespective of the presence of the TiO $_{2}$ pellets, while CO $_{2}$ was produced in the gas phase of the irradiation space and on the surface of the TiO $_{2}$ pellets. The total CO $_{2}$ concentration increased when the pellet layer was in the non-irradiation space. On the other hand, the concentration of CO $_{2}$ produced on the surface of the TiO $_{2}$ pellets in the irradiation space was higher than that in a non-irradiation space.

Oral presentation

Decomposition of xylene in air by electron beam irradiation and MnO $_{2}$ catalyst

Matsumoto, Kanae; Hakoda, Teruyuki; Shimada, Akihiko; Narita, Tadashi*; Kojima, Takuji

no journal, ,

no abstracts in English

Oral presentation

Oxidation of irradiation products from xylene in air using MnO $_{2}$ under electron beam irradiation

Matsumoto, Kanae; Hakoda, Teruyuki; Ito, Hisayoshi; Kojima, Takuji

no journal, ,

no abstracts in English

Oral presentation

Decomposition of xylene in air by electron beam irradiation using -AlO

Hakoda, Teruyuki; Matsumoto, Kanae; Mizuno, Akira*; Hirota, Koichi

no journal, ,

no abstracts in English

Oral presentation

Oxidation of xylene in air using -Al $_{2}$ O $_{3}$ under electron beam irradiation

Hakoda, Teruyuki; Matsumoto, Kanae*; Mizuno, Akira*; Hirota, Koichi

no journal, ,

no abstracts in English

Oral presentation

Oxidation of xylene using TiO $_{2}$ series catalyst under electron beam irradiation

Matsumoto, Kanae; Hakoda, Teruyuki; Narita, Tadashi*; Hirota, Koichi

no journal, ,

no abstracts in English

Oral presentation

Decomposition of xylene in air by electron beam irradiation using -Al $_{2}$ O $_{3}$

Hakoda, Teruyuki; Matsumoto, Kanae; Mizuno, Akira*; Hirota, Koichi

no journal, ,

no abstracts in English

Oral presentation

Determination of the quantity of OH radicals in EB-irradiated humid gases using oxidation of CO

Hakoda, Teruyuki; Shimada, Akihiko; Matsumoto, Kanae*; Hirota, Koichi

no journal, ,

The quantity of OH radicals, produced in humid N $_{2}$ under 1-MeV EB irradiation, was indirectly determined using an index of oxidation of CO to CO $_{2}$ , which has been used in atmospheric chemistry. The concentration of water vapor to fully react with the positive ions/excited species was examined under different initial concentrations of water vapor. The concentration of CO to scavenge completely the produced OH radicals was also measured under different initial CO concentrations. As a result, such concentrations of water vapor and CO were higher than 6,000 and 2,000 ppmv, respectively. The experiment using this condition of CO and water vapor demonstrated that the concentration of CO $_{2}$ , produced from reaction of CO with OH radicals, lineally increased with doses of 0-10 kGy and the G(OH) was estimated as 4.90.

Oral presentation