[논문]넓은 작동 온도범위를 가지는 V2O5-WO3/TiO2 SCR 촉매 개발을 위한 티타늄 이소프로폭사이드(TTIP) 활용 전략

이재호; 조광훈; 이금연; 임창용; 이영세; 김태욱

doi:10.14478/ace.2023.1048

넓은 작동 온도범위를 가지는 V2O5-WO3/TiO2 SCR 촉매 개발을 위한 티타늄 이소프로폭사이드(TTIP) 활용 전략
Titanium Isopropoxide (TTIP) Treatment Strategy for V2O5-WO3/TiO2 SCR Catalysts with a Wide Operating Temperature 원문보기

공업화학 = Applied chemistry for engineering, v.34 no.4, 2023년, pp.357 - 364

이재호 (경북대학교 에너지화학공학전공) , 조광훈 (경북대학교 에너지화학공학전공) , 이금연 (한국조선해양기자재연구원 적합성운영팀) , 임창용 (경북대학교 에너지화학공학전공) , 이영세 (경북대학교 에너지화학공학전공) , 김태욱 (경북대학교 에너지화학공학전공)

초록
AI-Helper

선택적 촉매 환원(SCR)은 질소산화물 배출을 줄이는 가장 효과적인 방법이지만, V₂O₅-WO₃/TiO₂ 촉매가 좁은 작동온도 (300~400℃) 범위를 가지기 때문에, V₂O₅-WO₃/TiO₂ 촉매의 작동 온도범위가 200~450℃인 새로운 촉매를 개발하였다. SCR 과정에서 생성되는 촉매 독인 황산암모늄은 350℃ 이상으로 가열함으로써 제거할 수 있다. 촉매 활성 부위의 수를 증가시키고 활성 물질의 분산을 촉진하기 위해 TiO₂ 지지체에 티타늄 이소프로폭사이드(TTIP) 처리를 여러 TTIP/TiO₂ 질량비로 진행하였다. 그 중 5 wt% TTIP 부하에서 높은 W 분산성으로 인해 열 안정성이 증가하였고 V⁵⁺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 TiO₂촉매의 표면을 개선하려는 연구자에게 이해하기 쉽게 설명하고자 하였다.

Abstract ▼ AI-Helper

Selective catalytic reduction (SCR) is the most effective method for reducing nitrogen oxide emissions, but the operating temperature range of V2O5-WO3/TiO2 catalysts is narrow (300~400℃). In this study, a new catalyst with an operating temperature range of 200~450℃ was developed. The catalyst poison, ammonium bisulfate, generated during the SCR process can be removed by heating above 350℃. To increase the number of active sites and promote the dispersion of active materials, titanium isopropoxide (TTIP) treatment was performed on the TiO2 support with various TTIP/TiO2 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.

주제어

표/그림 (12)

그림 Figure 1. (a) NO_x conversion and (b) N₂ and N₂O selectivities as functions of temperature for 2V10WTi_Ref and 2V10WTi_x TTIP (x = 1, 3, 5, 7). Reaction conditions: GHSV = 60,000 ^h-1; [NO] = [NH₃] = 300 ppm, [O₂] = 5 vol%, and [N₂] = balance[26]. Copyright 2022 Elsevier.
그림 Figure 2. (a) Effect of temperature on NO_x conversion, (b) Effect of temperature on N₂ selectivity for the studied catalysts. Reaction conditions: gas hourly space velocity = 60,000 ^h-1; [NO] = [NH₃] = 300 ppm, [O₂] = 5 vol%, and [N₂] = balance[27]. Copyright 2023 Elsevier.
그림 Figure 3. (a) Adsorption-desorption isotherms and (b) pore size distributions of 2V10WTi_Ref and 2V10WTi_xTTIP (x = 1, 3, 5, 7, 100)[26]. Copyright 2022 Elsevier.
$Figure 4. X-ray diffraction patterns of the reference catalyst (2V10WTi_Ref) and the catalysts prepared via the one-step ([1STEP] 2V10WTi_5TTIP) and two-step ([2STEP] 2V10WTi_5TTIP)[27]. Copyright 2023 Elsevier.$ 그림 Figure 4. X-ray diffraction patterns of the reference catalyst (2V10WTi_Ref) and the catalysts prepared via the one-step ([1STEP] 2V10WTi_5TTIP) and two-step ([2STEP] 2V10WTi_5TTIP)[27]. Copyright 2023 Elsevier.
그림 Figure 6. Fourier-transform infrared spectra of the reference catalyst (2V10WTi_Ref) and catalysts prepared via one-step ([1STEP] 2V10WTi_5TTIP) and two-step ([2STEP] 2V10WTi_ 5TTIP) approaches[27]. Copyright 2023 Elsevier.
그림 Figure 7. Raman spectra of the reference catalyst (2V10WTi_Ref) and the catalysts prepared via the one-step ([1STEP] 2V10WTi_5TTIP) and two-step ([2STEP] 2V10WTi_5TTIP) approaches[27]. Copyright 2023 Elsevier.
그림 Figure 5. FT-IR spectra of 2V10WTi_Ref and 2V10WTi_x TTIP (x = 1, 3, 5, 7)[26]. Copyright 2022 Elsevier.
그림 Figure 8. Deconvoluted Ti 2p and V 2p spectra of 2V10WTi_Ref and 2V10WTi_x TTIP (x = 1, 3, 5, 7)[26]. Copyright 2022 Elsevier.
그림 Figure 9. X-Ray Photoelectron spectroscopy survey scan results (showing peaks around the Ti 2p and V 2p region) for the reference catalyst (2V10WTi_Ref) and catalysts prepared via the one-step ([1STEP] 2V10WTi_5TTIP) and two-step ([2STEP] 2V10WTi_5TTIP) approaches [27].Copyright 2023 Elsevier.
표 Table 1. Percentages of the Valence States of V Obtained via X-Ray Photoelectron Spectroscopy for Reference Catalyst (2V10WTi_Ref) and Catalysts Prepared Using One-step ([1STEP] 2V10WTi_5TTIP) and Two-step ([2STEP] 2V10WTi_5TTIP) Approaches[27]. Copyright 2023 Elsevier
그림 Figure 10. Transmission electron microscopy images, corresponding elemental distributions, and Ti line scans of reference catalyst (2V10WTi_Ref) and catalysts prepared via one-step ([1STEP] 2V10WTi_5TTIP) and two-step ([2STEP] 2V10WTi_5TTIP) approaches[27]. Copyright 2023 Elsevier.
그림 Figure 11. In-situ DRIFT spectra of (a) reference catalyst (2V10WTi_Ref) and catalysts prepared via (b) one-step ([1STEP] 2V10WTi_5TTIP) and (c) two-step ([2STEP] 2V10WTi_5TTIP) approaches[27]. Copyright 2023 Elsevier.

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