원전에서 발생된 농축폐액 방사성폐기물로부터 및 를 분리 정량하기 위하여 potassium persulfate와 sulfuric acid의 산화제를 이용하는 산화증류법을 적용하였으며, 와 는 각각 기체와 HTO 액체로 순차적으로 분리되었다. 분리된 와 는 액체섬광계수기를 이용하여 계수되었고, 소광효과를 보정하여 방사능을 측정하였다. 산화증류법을 검증하기 위하여 방사성 표준물은 와 , 그리고 의 3종류, 그리고 방사성 표준물은 HTO가 이용되었다. 또한 산화되기 어려운 방향족 화합물 중 을 대상으로 가장 최적의 산화 조건을 조사하고자 황산용액 농도에 따라 FT-IR 피크 변화를 평가하였다. 방사성표준시료의 경우와 동일한 방법으로 원전 농축폐액 시료로부터 와 를 분리 검출하였는데, 그 결과 회수율은 와 가 각각 Bq/g와 Bq/g로 검출되었다.

Thermolysis of Cu(NO3)2·3H2O impregnated activated carbon fiber (ACF) was studied by means of XRD analysis to obtain Cu-impregnated ACF. Cu(NO3)2·3H2O was converted into Cu2O around 230℃. The Cu2O was reduced to Cu at 400℃, resulting in ACF-C(Cu). Some Cu particles have a tendency to aggregate through the heat treatment, resulting in the ununiform distribution in ACF. Catalytic decomposition of NO gas has been performed by Cu-impregnated ACF in a column reactor at 400℃. Initial NO concentration was 1300 ppm diluted in helium gas. NO gas was effectively decomposed by 5~10 wt% Cu-impregnated ACF at 400℃. The concentration of NO was maintained less than 200 ppm for 6 hours in this system. The ACF-C(Cu) deoxidized NO to N2 and was reduced to ACF-C(Cu2O) in the initial stage. The ACF-C(Cu2O) also deoxidized NO to N2 and reduced to ACF-C(CuO). This ACF-C(CuO) was converted again into ACF-C(Cu) by heating. There was no consumption of ACF in mass during thermolysis and catalytic decomposition of NO to N2 by copper. The catalytic decomposition was accelerated with increase of the reaction temperature.

We have mapped the C 3 H 2 2 12 − 1 01 transition line toward the Sgr A molecular cloud on a 1' grid spacing and derived C 3 H 2 column densities of 3 \~ 7 × 10 14 c m − 2 for molecular clouds of Sgr A. The fractional abundances of C 3 H 2 relative to H 2 are obtained to be 3 \~ 6 × 10 − 9 , which are slightly lower than that for the cold dark cloud TMC-1 but are enhanced by factors of 5-60 compared to those for Sgr B2 and the Orion extended ridge. We also estimate from the C 3 H 2 column densities total masses of \~ 10 6 M ⨀ for two clouds (M - 0.13 - 0.08 and M - 0.02 - 0.07), which are thought to be close to the virial equilibrium. We suggest that the large abundance of C 3 H 2 in Sgr A may be partly due to the activities of the Galactic center.

TiO2- and SiO2-supported Co3O4, Pt and Co3O4-Pt catalysts have been studied for CO and C3H8 oxidations at temperatures less than 250℃ which is a lower limit of light-off temperatures to oxidize them during emission test cycles of gasoline-fueled automotives with TWCs (three-way catalytic converters) consisting mainly of Pt, Pd and Rh. All the catalysts after appropriate activation such as calcination at 350℃ and reduction at 400℃ exhibited significant dependence on both their preparation techniques and supports upon CO oxidation at chosen temperatures. A Pt/TiO2 catalyst prepared by using an ion-exchange method (IE) has much better activity for such CO oxidation because of smaller Pt nanoparticles, compared to a supported Pt obtained via an incipient wetness (IW). Supported Co3O4-only catalysts are very active for CO oxidation even at 100℃, but the use of TiO2 as a support and the IW technique give the best performances. These effects on supports and preparation methods were indicated for Co3O4-Pt catalysts. Based on activity profiles of CO oxidation at 100℃ over a physical mixture of supported Pt and Co3O4 after activation under different conditions, and typical light-off temperatures of CO and unburned hydrocarbons in common TWCs as tested for C3H8 oxidation at 250℃ with a Pt-exchanged SiO2 catalyst, this study may offer an useful approach to substitute Co3O4 for a part of platinum group metals, particularly Pt, thereby lowering the usage of the precious metals.