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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.
Shimoyama, Iwao; Baba, Yuji
Carbon, 98, p.115 - 125, 2016/03
Times Cited Count：34 Percentile：72.68(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 
-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.
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
and NO
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.
Tokunaga, Okihiro
Genshiryoku Shisutemu Nyusu, 9(1), 6 Pages, 1998/06
no abstracts in English
Tokunaga, Okihiro
Environmental Applications of Ionizing Radiation, p.99 - 112, 1998/00
no abstracts in English
Tokunaga, Okihiro
Hikari Oyobi Kassei Kagakushu No Hanno Kogaku; Kagaku Kogaku Shimpojiumu Shirizu 62, p.21 - 27, 1998/00
no abstracts in English
Namba, Hideki; Hashimoto, Shoji; Tokunaga, Okihiro; *
Radiation Physics and Chemistry, 53(6), p.673 - 681, 1998/00
Times Cited Count：11 Percentile：66.43(Chemistry, Physical)no abstracts in English
Tokunaga, Okihiro
Sci. Technol. Jpn., 16(64), p.47 - 50, 1998/00
no abstracts in English
Hashimoto, Shoji; Tokunaga, Okihiro
OHM (Sougou Denki Zasshi), 82(9), p.55 - 59, 1995/09
no abstracts in English
*; *; Tokunaga, Okihiro; Hashimoto, Shoji; Namba, Hideki; *; *
Denki Hyoron, 0(8), p.70 - 73, 1995/08
no abstracts in English
Namba, Hideki
Genshiryoku Kogyo, 41(7), p.20 - 23, 1995/00
no abstracts in English
Namba, Hideki
Shitsuryo Bunseki, 43(5), p.313 - 322, 1995/00
no abstracts in English
Tokunaga, Okihiro
Nenryo Oyobi Nensho, 60(10), p.746 - 752, 1993/00
no abstracts in English
/SO
removalTokunaga, 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
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
Tokunaga, Okihiro
OHM (Sougou Denki Zasshi), 79(12), p.13 - 15, 1992/12
no abstracts in English
Tokunaga, Okihiro
Kagaku Sochi, 34(8), p.55 - 59, 1992/08
no abstracts in English
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
Tokunaga, Okihiro
Koatsu Gasu, 29(12), p.850 - 852, 1992/00
no abstracts in English
Tokunaga, Okihiro
Isotope News, 0(450), p.8 - 11, 1991/12
no abstracts in English
