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- 주제어 : Titanium isopropoxide (TTIP) (검색결과 3 건)
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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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정유진,김범식,정보라,김홍대,원종민,차광서,차진선 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.4
The deactivation and thermal regeneration characteristics of a V2O5-WO3/TiO2 catalyst modified with titanium isopropoxide (TTIP) were investigated after it was applied for 2,400 h at 240 °C in a selective catalytic reduction (SCR) pilot plant to purify the exhaust gas from an iron ore sintering process in steelworks. Evolved gas analysis/mass spectrometry (EGA/MS) analysis was adopted to determine the temperature for thermal regeneration, and thermal treatment was performed at the determined temperature for 3 h in a N2 atmosphere. The catalysts (Fresh catalyst: N-Cat, used catalyst: U-Cat, and thermally regenerated catalyst: R-Cat-X (X is thermal regeneration temperature)) were analyzed by elemental analyzer, X-ray fluorescence (XRF, component analysis), Brunauer-Emmett-Teller (BET, specific surface area and porosity), scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS, surface micro-structure and components), X-ray diffraction (XRD, crystalline structure), and Fourier-transform infrared (FT-IR, surface functional group). Thermal regeneration of catalyst was evaluated by NOx removal efficiency, depending on the regeneration temperature. It was found that the deactivation of the catalyst occurred due to the reduction of specific surface area and porosity by ammonium (bi)sulfate (AS or ABS). The NOx removal efficiency of the R-Cat-400 and the R-Cat-500 reached to 98.5% and 99.1%, respectively. Due to the breakdown of AS and ABS during the thermal regeneration, those results were quite similar to those of the N-Cat. Although the NOx removal efficiency of the R-Cat-500 was higher than that of the R-Cat-400, the temperature for thermal regeneration needs to be determined under consideration of the emission of high concentration of SO2 emitted during thermal regeneration.
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Geumyeon Lee,예보라,Myeung-jin Lee,Seung-Yeop Chun,Bora Jeong,김홍대,제정호,Taewook Kim 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.109 No.-
Although the selective catalytic reduction (SCR) of NOx is the most effective way to reduce related emissions,the V2O5-WO3/TiO2 catalyst which is most used for this purpose has a narrow operation temperaturerange of 300–400 C and, therefore, has limited applicability. Hence, better catalysts with moreabundant active sites and a wider range of acceptable temperatures (240–450 C) are required, especiallybecause heating at 350 C allows for removal of ammonium sulfate, a catalyst poison that is formed duringSCR. Herein, we aim to produce such catalysts by treating the TiO2 support with titanium isopropoxide(TTIP) at several TTIP/TiO2 mass ratios, as this treatment is expected to increase the number ofcatalytically active sites and facilitate the dispersal of active materials. The optimal performance, whichwas observed for the catalyst prepared at a TTIP loading of 5 wt%, was ascribed to the increased thermalstability caused by the high extent of W dispersion and the formation of V4+ by the reaction of V5+ withsurface Ti3+. Therefore, these results pave the way for the fabrication of more efficient NOx removalcatalysts.
ScienceON
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