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Journal Articles

Formation of carbon alloys by low-energy ion doping and its application for adsorptive desulfurization

Shimoyama, Iwao

Hoshasen To Sangyo, (141), p.7 - 11, 2016/12

Desulfurization is an indispensable process on hydrogen formation from fossil fuel. Adsorptive desulfurization, alternative to conventional hydrogenation desulfurization, requires development of stable activated carbon adsorbents with high performance. I study dopant dependence on thiophene adsorption for carbon alloys prepared by heteroatom doping using low-energy ion beam. I doped nitrogen and phosphorus as dopants of group 15 elements in graphite surfaces, and clarified that phosphorus is superior in thiophene adsorption to nitrogen, and that the effect of phosphorus is higher with room temperature doping than with high temperature doping by about 10 times. X-ray absorption spectroscopy indicated that local structures around phosphorus sites were different between them. I attribute the high adsorption property to formation of curved phosphorus sites prepared by room temperature doping. Above results suggest that the property of carbon alloy can be controlled by low-energy ion beam.

Journal Articles

Thiophene adsorption on phosphorus- and nitrogen-doped graphites; Control of desulfurization properties of carbon materials by heteroatom doping

Shimoyama, Iwao; Baba, Yuji

Carbon, 98, p.115 - 125, 2016/03

 Times Cited Count:20 Percentile:16.62(Chemistry, Physical)

The amounts of adsorbed thiophene were compared among phosphorus- and nitrogen-doped graphite and graphite damaged by Ar$$^{+}$$ irradiation to clarify the influence of heteroatom doping on the adsorptive desulfurization properties of $$pi$$-conjugated carbon materials. On the basis of thiophene coverages estimated from X-ray photoelectron spectroscopy, Phosphorus-doped graphite had an adsorption ability that was 10-20 times larger than that of Nitrogen-doped graphite, indicating that the adsorptive desulfurization property of carbon largely depends on dopant atoms. Polarization dependent analysis using near-edge X-ray absorption fine structure spectroscopy was used to distinguish the configurations at dopant sites, indicating that the curved structures of phosphorus sites exhibited approximately 10 times greater adsorption abilities when compared with the planar structures. Theoretical simulation using molecular orbital calculations indicated different dopant effects between phosphorus and nitrogen along with different thiophene adsorption behaviors between planar and curved structures. Finally, experimental thiophene desorption results obtained at different temperatures revealed an advantage of phosphorus doping for reactivation.

Journal Articles

Environment purification technology using ionizing radiation

Kojima, Takuji

Hoshasen, 29(2), p.77 - 85, 2003/04

The radiation technologies for environment conservation are useful for purification of pollutants contained in flue gas or wastewater at very low concentration which is difficult to perform by conventional methods: removal using fine filter or charcoals and decomposition using catalysis at high temperature, etc. This paper reviews some examples of radiation application to removal of SO$$_2$$ and NO$$_x$$ from coal-combustion flue gases, decomposition of dioxin in gas emitted through the incinerator, decomposition of gaseous toxic volatile organic compounds in off gas, reuse of agricultural wastes.

Journal Articles

Electron beam purification of flue gas

Tokunaga, Okihiro

Genshiryoku Shisutemu Nyusu, 9(1), 6 Pages, 1998/06

no abstracts in English

Journal Articles

Electron beam technology for purification of flue gas

Tokunaga, Okihiro

Environmental Applications of Ionizing Radiation, p.99 - 112, 1998/00

no abstracts in English

Journal Articles

Electron-beam technology for purification of flue gas

Tokunaga, Okihiro

Hikari Oyobi Kassei Kagakushu No Hanno Kogaku; Kagaku Kogaku Shimpojiumu Shirizu 62, p.21 - 27, 1998/00

no abstracts in English

Journal Articles

Electron beam treatment of lignite-burning flue gas with high concentrations of sulfur dioxide and water

Namba, Hideki; Hashimoto, Shoji; Tokunaga, Okihiro; *

Radiation Physics and Chemistry, 53(6), p.673 - 681, 1998/00

 Times Cited Count:10 Percentile:32.61

no abstracts in English

Journal Articles

A Technique for desulfurization and denitration of exhaust gases using an electron beam

Tokunaga, Okihiro

Sci. Technol. Jpn., 16(64), p.47 - 50, 1998/00

no abstracts in English

Journal Articles

Technology for electron beam treatment of coal fired flue gas

Hashimoto, Shoji; Tokunaga, Okihiro

OHM (Sougou Denki Zasshi), 82(9), p.55 - 59, 1995/09

no abstracts in English

Journal Articles

To establish the technology with simultaneous removal of SOx and NOx in dry system; The development of electron beam flue gas treatment technology for coal-fired flue gas

*; *; Tokunaga, Okihiro; Hashimoto, Shoji; Namba, Hideki; *; *

Denki Hyoron, 0(8), p.70 - 73, 1995/08

no abstracts in English

Journal Articles

Basic research for electron beam flue gas treatment

Namba, Hideki

Genshiryoku Kogyo, 41(7), p.20 - 23, 1995/00

no abstracts in English

Journal Articles

Role of ion-molecule reactions in electron beam flue gas treatment

Namba, Hideki

Shitsuryo Bunseki, 43(5), p.313 - 322, 1995/00

no abstracts in English

Journal Articles

Electron beam purification of flue gas

Tokunaga, Okihiro

Nenryo Oyobi Nensho, 60(10), p.746 - 752, 1993/00

no abstracts in English

Journal Articles

Experiments on chemical reactions in electron-beam-induced NO$$_{x}$$/SO$$_{2}$$ removal

Tokunaga, Okihiro; Namba, Hideki; Hirota, Koichi

Non-thermal Plasma Techniques for Pollution Control; NATO ASI Series, G34(PART B), p.55 - 62, 1993/00

no abstracts in English

Journal Articles

Pilot-plant for NOx,SO$$_{2}$$ and HCl removal from flue-gas of municipal waste incinerator by electron beam irradiation

*; *; *; Tokunaga, Okihiro; Miyata, Teijiro; Hirota, Koichi; *; *; *; *

Radiation Physics and Chemistry, 42(4-6), p.679 - 682, 1993/00

no abstracts in English

Journal Articles

Pilot plant test for electron beam treatment of flue gas of coal-burning boilers

Tokunaga, Okihiro

OHM (Sougou Denki Zasshi), 79(12), p.13 - 15, 1992/12

no abstracts in English

Journal Articles

Feature of electron beam treatment of flue gas and present status of its development

Tokunaga, Okihiro

Kagaku Sochi, 34(8), p.55 - 59, 1992/08

no abstracts in English

Journal Articles

Electron beam treatment of flue gas from a municipal waste incinerator

Tokunaga, Okihiro; Aoki, Yasushi; Sato, Shoichi; *; *; *; *

Applications of Isotopes and Radiation in Conservation of the Environment, p.105 - 114, 1992/00

no abstracts in English

Journal Articles

Electron-beam treatment of flue gas from municipal waste incinerators

Tokunaga, Okihiro

Koatsu Gasu, 29(12), p.850 - 852, 1992/00

no abstracts in English

Journal Articles

Electron beam treatment of flue gas

Tokunaga, Okihiro

Isotope News, 0(450), p.8 - 11, 1991/12

no abstracts in English

25 (Records 1-20 displayed on this page)