파이로프로세싱 배기체 요오드 포집을 위한 구리메쉬 적용 가능성에 대한 기초연구 A Preliminary Study on the Feasibility of Copper Mesh as an Off-Gas Iodine Capturing Medium for Pyroprocessing원문보기
본 연구에서는 파이로프로세싱에서 발생하는 배기체 내 요오드 포집을 위한 매질로서 고가의 은 기반 흡착제를 대체하기 위한 상용 구리메쉬의 가능성에 대해 연구하였다. 열역학적 계산을 통해 구리 금속과 요오드 기체의 반응은 100 ~ 500℃ 온도 범위에서 자발적으로 일어나며 요오드화구리(CuI)를 형성할 것으로 예상되었다. 실험을 통해 반응 온도에 따른 요오드 포집 효율의 영향을 분석한 결과, 1개의 구리메쉬(질량 0.26 g)를 이용하여 반응 온도를 300, 400℃로 변화하였을 때 각각 5 및 6 wt%의 요오드(초기질량 2.0 g)가 포집됨을 확인하였다. 또한, 반복 실험 결과를 토대로 구리메쉬 표면에 형성된 반응 생성물(CuI)의 자발적인 탈리 현상으로 구리의 활용률이 증가할 수 있음을 확인하였다. 반응 생성물의 CuI 상 형성은 X-선 회절 실험을 통해 확인하였으며, 표면 분석은 주사전자현미경을 이용하여 수행하여 그 결과를 보고하였다.
본 연구에서는 파이로프로세싱에서 발생하는 배기체 내 요오드 포집을 위한 매질로서 고가의 은 기반 흡착제를 대체하기 위한 상용 구리메쉬의 가능성에 대해 연구하였다. 열역학적 계산을 통해 구리 금속과 요오드 기체의 반응은 100 ~ 500℃ 온도 범위에서 자발적으로 일어나며 요오드화구리(CuI)를 형성할 것으로 예상되었다. 실험을 통해 반응 온도에 따른 요오드 포집 효율의 영향을 분석한 결과, 1개의 구리메쉬(질량 0.26 g)를 이용하여 반응 온도를 300, 400℃로 변화하였을 때 각각 5 및 6 wt%의 요오드(초기질량 2.0 g)가 포집됨을 확인하였다. 또한, 반복 실험 결과를 토대로 구리메쉬 표면에 형성된 반응 생성물(CuI)의 자발적인 탈리 현상으로 구리의 활용률이 증가할 수 있음을 확인하였다. 반응 생성물의 CuI 상 형성은 X-선 회절 실험을 통해 확인하였으며, 표면 분석은 주사전자현미경을 이용하여 수행하여 그 결과를 보고하였다.
A commercially available copper mesh was investigated as an iodine off-gas capturing medium for pyroprocessing, with an aim to replace costly silver based adsorbents. Theoretical calculation results suggested that the reaction between metallic copper and gaseous iodine will occur spontaneously to pr...
A commercially available copper mesh was investigated as an iodine off-gas capturing medium for pyroprocessing, with an aim to replace costly silver based adsorbents. Theoretical calculation results suggested that the reaction between metallic copper and gaseous iodine will occur spontaneously to produce copper iodide in the temperature range of 100 ~ 500℃. The effect of the reaction temperature on iodine capturing efficiency was investigated by experimentation, and it was found that 5 and 6 wt% of iodine (initial mass 2.0 g) was captured by a single copper mesh (0.26 g) at 300 and 400℃, respectively. The repeated experimental results also suggested that copper utilization can be increased with the help of the spontaneous detachment of the reaction product (CuI) from a copper mesh. The formation of the CuI phase was confirmed using the X-ray diffraction technique, and the surface morphology of the reaction product was observed using scanning electron microscopy.
A commercially available copper mesh was investigated as an iodine off-gas capturing medium for pyroprocessing, with an aim to replace costly silver based adsorbents. Theoretical calculation results suggested that the reaction between metallic copper and gaseous iodine will occur spontaneously to produce copper iodide in the temperature range of 100 ~ 500℃. The effect of the reaction temperature on iodine capturing efficiency was investigated by experimentation, and it was found that 5 and 6 wt% of iodine (initial mass 2.0 g) was captured by a single copper mesh (0.26 g) at 300 and 400℃, respectively. The repeated experimental results also suggested that copper utilization can be increased with the help of the spontaneous detachment of the reaction product (CuI) from a copper mesh. The formation of the CuI phase was confirmed using the X-ray diffraction technique, and the surface morphology of the reaction product was observed using scanning electron microscopy.
A crystal structural analysis of the reaction products was conducted using an X-ray diffraction (XRD) technique. A morphology analysis of the reaction products was conducted using the Scanning Electron Microscopy (SEM) technique.
The morphology of the reaction product was investigated using the SEM technique, and the results are shown in Fig. 5.
Before getting started with the experiments, theoretical calculations were performed to estimate the appropriate reaction temperature for the reaction between copper and gaseous iodine. The ‘Reaction equations’ module of the HSC chemistry code [10] was employed in this work to calculate the Gibbs free energy of the reaction between copper and iodine. Table 1 lists the calculation results achieved using the HSC chemistry code [10].
성능/효과
The optimal reaction temperature was identified to be within the 300 ~ 400℃ range based on the iodine capturing efficiency. At 400℃, 6wt% of iodine was capture by a single copper mesh, and this promising result suggests that the stacking of copper meshes will be a reasonable approach for the complete capture of iodine generated from the pyroprocessing. Future works on the reaction rate between Cu and I, the complete consumption of a copper mesh, and the complete capturing of iodine might provide methods for the commercial application of a copper mesh as a cheap and effective medium for iodine capturing.
The feasibility of a copper mesh as an iodine capturing medium during the pyroprocessing was investigated within a temperature of 100 ~ 400℃. The optimal reaction temperature was identified to be within the 300 ~ 400℃ range based on the iodine capturing efficiency.
The feasibility of a copper mesh as an iodine capturing medium during the pyroprocessing was investigated within a temperature of 100 ~ 400℃. The optimal reaction temperature was identified to be within the 300 ~ 400℃ range based on the iodine capturing efficiency. At 400℃, 6wt% of iodine was capture by a single copper mesh, and this promising result suggests that the stacking of copper meshes will be a reasonable approach for the complete capture of iodine generated from the pyroprocessing.
후속연구
Here, it should be noted that the value of 24 μm is not the maximum thickness that CuI can grow before a spontaneous peeling-off. Further investigation should be done to determine the maximum CuI thickness including its effect on the Cu-I reaction rate.
At 400℃, 6wt% of iodine was capture by a single copper mesh, and this promising result suggests that the stacking of copper meshes will be a reasonable approach for the complete capture of iodine generated from the pyroprocessing. Future works on the reaction rate between Cu and I, the complete consumption of a copper mesh, and the complete capturing of iodine might provide methods for the commercial application of a copper mesh as a cheap and effective medium for iodine capturing. In addition, it would be an excellent future research issue to identify the reaction between Cu and CsI, which is considered as one of main constituents of volatile iodine compounds.
Future works on the reaction rate between Cu and I, the complete consumption of a copper mesh, and the complete capturing of iodine might provide methods for the commercial application of a copper mesh as a cheap and effective medium for iodine capturing. In addition, it would be an excellent future research issue to identify the reaction between Cu and CsI, which is considered as one of main constituents of volatile iodine compounds.
참고문헌 (12)
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