Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Thermal Deactivation of Plate-type V2O5-WO3/TiO2 SCR Catalyst

Plate-type V2O5-WO3/TiO2 SCR 촉매의 열적 비활성화 특성

  • Cha, Jin-Sun (Material Technology Center, Korea Testing Laboratory) ;
  • Park, Jin-Woo (Nano Co., Ltd.) ;
  • Jeong, Bora (Green Materials & Processes Group, Ulsan Regional Division, Korea Institute of Industrial Technology) ;
  • Kim, Hong-Dae (Green Materials & Processes Group, Ulsan Regional Division, Korea Institute of Industrial Technology) ;
  • Park, Sam-Sik (Nano Co., Ltd.) ;
  • Shin, Min-Chul (Material Technology Center, Korea Testing Laboratory)
  • 차진선 (한국산업기술시험원 재료기술센터) ;
  • 박진우 ((주)나노) ;
  • 정보라 (한국생산기술연구원 울산지역본부 친환경재료공정그룹) ;
  • 김홍대 (한국생산기술연구원 울산지역본부 친환경재료공정그룹) ;
  • 박삼식 ((주)나노) ;
  • 신민철 (한국산업기술시험원 재료기술센터)
  • Received : 2017.08.19
  • Accepted : 2017.08.24
  • Published : 2017.10.10
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Abstract

In the present paper, the thermal deactivation characteristics of plate-type commercial $V_2O_5-WO_3/TiO_2$ SCR catalyst were investigated. For this purpose, the plate-type catalyst was calcined at different temperatures ranging from $500^{\circ}C$ to $800^{\circ}C$ for 3 hours. Structural and morphological changes were characterized byXRD, specific surface area, porosity, SEM-EDS and also NOx conversion with ammonia according to the calcine temperature. The NOx conversion decreased with increasing calcine temperature, especially when the catalysts were calcined at temperatures above $700^{\circ}C$. This is because the crystal phase of $TiO_2$ changed from anatase to rutile, and the $TiO_2$ grain growth and $CaWO_4$ crystal phase were formed, which reduced the specific surface area and pore volume. In addition, $V_2O_5$, which is a catalytically active material, was sublimated or vaporized over $700^{\circ}C$, and a metal mesh used as a support of the catalyst occurred intergranular corrosion and oxidation due to the formation of Cr carbide.

본 연구에서는 plate-type의 $V_2O_5-WO_3/TiO_2$ SCR 촉매의 열적 비활성화 특성을 고찰하였다. 이를 위하여 plate type의 촉매를 $500{\sim}800^{\circ}C$의 온도에서 3 h 동안 열처리하였다. 촉매의 특성 변화를 고찰하기 위하여 XRD, $N_2$ adsorption-desorption에 의한 비표면적과 기공특성, SEM-EDS 등을 측정하였으며, 열처리 온도에 따른 NOx 전환율을 측정하였다. NOx 전환율은 열처리 온도가 증가함에 따라 감소하였는데 $700^{\circ}C$ 이상인 경우에 크게 감소하였다. 이는 $TiO_2$의 결정상이 anatase에서 rutile로 변하고, $TiO_2$의 입성장 및 $CaWO_4$와 같은 결정상이 생성되어 촉매의 비표면적과 기공부피가 감소하였기 때문이다. 또한 $700^{\circ}C$ 이상의 온도에서는 촉매 활성물질인 $V_2O_5$가 승화/기화되었으며, 촉매의 담지체로 사용되는 금속 지지체는 Cr 탄화물 형성에 따른 입계 부식과 산화가 발생하는 것으로 나타났다.

Keywords

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