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졸겔법으로 합성된 Me-TiO<sub>2</sub>-sol의 광촉매 산화반응을 이용한 실내오염물질 제거활성 연구
안석현 ( Suk-hyun Ahn ),정민기 ( Min-gie Jung ),정진도 ( Jin-do Chung ) 한국환경기술학회 2020 한국환경기술학회지 Vol.21 No.6
In this study, a TiO<sub>2</sub>-sol photocatalytic study was conducted to remove CO, HCHO, and CH<sub>3</sub>CHO corresponding to various indoor pollutants. After coating on the inner surface of pyrex tube of various prepared TiO<sub>2</sub>-sol photocatalysts, the coating property was confirmed through FE-SEM analysis, and excellent removal performance was confirmed in uniform coating properties of TiO<sub>2</sub> particles. However, the studied TiO<sub>2</sub>-sol photocatalyst has very low reaction activity to CO and HCHO, and can be solved through calcination/reduction heat treatment process by adding a noble metal Pt to solve this. Particularly, it was confirmed that the Pt/TiO<sub>2</sub>-sol photocatalyst increased the formation and dispersion of the surface Pt<sup>0</sup> species through a reduction process, thereby improving the removal performance of CO, HCHO, and CH<sub>3</sub>CHO.
Se-TiO2 지지체를 이용한 V/W/TiO2 NH3-SCR 촉매의 반응 특성 연구
이연진 ( Yeon Jin Lee ),원종민 ( Jong Min Won ),안석현 ( Suk Hyun Ahn ),홍성창 ( Sung Chang Hong ) 한국공업화학회 2021 공업화학 Vol.32 No.6
본 연구는 질소산화물 제거를 위하여 암모니아를 환원제로 사용하는 선택적 촉매 환원법에 있어 지지체에 셀레늄을 첨가하여 300 ℃ 이하에서 V<sub>2</sub>O<sub>5</sub>/WO<sub>3</sub>/TiO<sub>2</sub>의 반응 활성을 증진시키기 위한 실험 및 반응특성 연구를 수행하였다. 졸-겔법으로 Se-TiO<sub>2</sub> 및 TiO<sub>2</sub>를 합성하였으며, 이를 지지체로 하여 V<sub>2</sub>O<sub>5</sub>/WO<sub>3</sub>/TiO<sub>2</sub> 및 V<sub>2</sub>O<sub>5</sub>/WO<sub>3</sub>/Se-TiO<sub>2</sub> 촉매를 제조하여 상용 촉매와 반응 활성을 비교하였다. 실험 결과, 졸-겔법으로 합성한 TiO<sub>2</sub>를 사용한 촉매의 탈질 효율이 상용 TiO<sub>2</sub>를 사용하여 제조한 촉매보다 낮은 결과를 보였으나 셀레늄을 첨가함에 따라 탈질 효율이 증진되었다. 따라서 BET, XRD, Raman, H<sub>2</sub>-TPR 및 FT-IR분석을 통하여 셀레늄의 첨가가 촉매의 구조에 미치는 영향을 분석하였으며 셀레늄 첨가에 의한 비표면적의 증가와 단량체 및 복합체 바나듐 종의 형성이 반응 특성에 미치는 영향을 확인하였다. In this study, an experiment and a reaction characteristic study were conducted to enhance the reaction activity of V<sub>2</sub>O<sub>5</sub>/WO<sub>3</sub>/TiO<sub>2</sub> at 300 °C or less by adding selenium to the support, in a selective catalytic reduction method using ammonia as a reducing agent to remove nitrogen oxides. Se-TiO<sub>2</sub> and TiO<sub>2</sub> were synthesized using the sol-gel method, and used as a support when preparing V<sub>2</sub>O<sub>5</sub>/WO<sub>3</sub>/TiO<sub>2</sub> and V<sub>2</sub>O<sub>5</sub>/WO<sub>3</sub>/Se-TiO<sub>2</sub> catalysts. The reaction activity of our catalyst was compared with that of a commercial catalyst. The denitration efficiency of the catalyst using TiO<sub>2</sub> prepared by the sol-gel method was lower than that of the catalyst prepared using commercial TiO<sub>2</sub>, but was improved by the addition of selenium. Thus, the effect of selenium addition on the catalyst structure was analyzed using BET, XRD, Raman, H<sub>2</sub>-TPR, and FT-IR measurements and the effect of the increase in specific surface area by selenium addition and the formation of monomer and complex vanadium species on reaction characteristics were confirmed.