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- 저자 : 이금연 ( Geumyeon Lee ) (검색결과 2 건)
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Geumyeon Lee(이금연),Bora Jeong(정보라),Hangyu Im(임한규),Hong-Dae Kim(김홍대),Teawook Kim(김태욱) 한국에너지기후변화학회 2021 한국에너지기후변화학회 학술대회 Vol.2021 No.5
Nitrogen oxides (NOx) discharged from stationary sources such as industrial facilities, cement kilns and fossil fuel power stations, which are recognized as place where it occurs severe environmental pollution problems causing nitrate particulate and photochemical smog. Because the regulations related with NOx emission has been become more stringent, denitration catalysts are required following: high performance and wide active temperature for a variety of applications. V2O5-WO3/TiO2 catalysts, commercially used selective catalytic reduction (SCR) catalysts, have relative narrow and active temperature range of 350-450°C. This study is investigated to extend to wide operating temperature range of 240-450°C. The catalysts are prepared by co-precipitation of V-W-Ti which briefly described as V2O5, WO3 and Ti supported on TiO2 powder. Through method of co-precipitation, the formed functional group increase active sites. Consequently synthesized catalyst with co-precipitation shows the high NOx removal efficiency in a wide active temperature range of 240-450°C by controlling active sites.
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이재호 ( Jaeho Lee ),조광훈 ( Gwang-hun Cho ),이금연 ( Geumyeon Lee ),임창용 ( Changyong Yim ),이영세 ( Young-sei Lee ),김태욱 ( Taewook Kim ) 한국공업화학회 2023 공업화학 Vol.34 No.4
선택적 촉매 환원(SCR)은 질소산화물 배출을 줄이는 가장 효과적인 방법이지만, V<sub>2</sub>O<sub>5</sub>-WO<sub>3</sub>/TiO<sub>2</sub> 촉매가 좁은 작동온도(300~400 ℃) 범위를 가지기 때문에, V<sub>2</sub>O<sub>5</sub>-WO<sub>3</sub>/TiO<sub>2</sub> 촉매의 작동 온도범위가 200~450 °C인 새로운 촉매를 개발하였다. SCR 과정에서 생성되는 촉매 독인 황산암모늄은 350 °C 이상으로 가열함으로써 제거할 수 있다. 촉매 활성 부위의수를 증가시키고 활성 물질의 분산을 촉진하기 위해 TiO<sub>2</sub> 지지체에 티타늄 이소프로폭사이드(TTIP) 처리를 여러 TTIP/TiO<sub>2</sub> 질량비로 진행하였다. 그 중 5 wt% TTIP 부하에서 높은 W 분산성으로 인해 열 안정성이 증가하였고 V<sup>5+</sup>가 형성되어 최적의 성능을 보였다. 5 wt% TTIP 부하로 처리된 촉매를 One-step co-precipitation으로 제조하였을 때 기존의 방법보다 더 나은 V-OH와 W-OH 분산 및 상호작용 향상이 나타나 더 낮은 온도에서 높은 촉매 활성으로 인해 향상된 성능을 보였다. 이를 향후 TTIP를 이용하여 TiO<sub>2</sub>촉매의 표면을 개선하려는 연구자에게 이해하기 쉽게 설명하고자 하였다. Selective catalytic reduction (SCR) is the most effective method for reducing nitrogen oxide emissions, but the operating temperature range of V<sub>2</sub>O<sub>5</sub>-WO<sub>3</sub>/TiO<sub>2</sub> catalysts is narrow (300~400 °C). In this study, a new catalyst with an operating temperature range of 200~450 °C was developed. The catalyst poison, ammonium bisulfate, generated during the SCR process can be removed by heating above 350 °C. To increase the number of active sites and promote the dispersion of active materials, titanium isopropoxide (TTIP) treatment was performed on the TiO<sub>2</sub> support with various TTIP/TiO<sub>2</sub> mass ratios. Among them, the 5 wt% TTIP loaded catalyst showed improved performance due to higher thermal stability caused by high W dispersion and the formation of V5+. In addition, the 5 wt% TTIP-loaded catalyst prepared by a one-step co-precipitation method showed greater V-OH and W-OH dispersion and enhanced interactions in contrast to conventional methods, resulting in higher catalytic activity at lower temperatures. This review article aims to provide an accessible explanation for researchers investigating how to improve the surface properties of TiO2 catalysts using TTIP.
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