서지주요정보
휘발성 유기화합물 제거를 위한 흡착 및 촉매의 이원 기능을 갖는 제올라이트 Y에 담지된 은 촉매의 특성에 관한 연구 = A study on the characteristics of Ag/Zeolite Y as a dual functional adsorbent/catalyst medium for VOC destruction
서명 / 저자 휘발성 유기화합물 제거를 위한 흡착 및 촉매의 이원 기능을 갖는 제올라이트 Y에 담지된 은 촉매의 특성에 관한 연구 = A study on the characteristics of Ag/Zeolite Y as a dual functional adsorbent/catalyst medium for VOC destruction / 김정랑.
저자명 김정랑 ; Kim, Jeong-Rang
발행사항 [대전 : 한국과학기술원, 2004].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8015120

소장위치/청구기호

학술문화관(문화관) 보존서고

MCBE 04007

휴대폰 전송

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초록정보

Volatile organic compounds (VOC’s) are considered as one of the main air pollutants, and legislation has already been introduced to reduce their emission in many countries. In addition to main emission sources such as petroleum industries, there are many local sources such as painting, printing and laundering etc. which emit low concentration VOC’s. Modified adsorption system (MAS) was suggested to control VOC’s stream with low concentration and high flow rate. The MAS was based on the procedure of adsorption followed by treatment of the concentrated VOC such as incineration (catalytic or thermal) or recovery. Moreover there have been attempts to develop a dual-functional adsorbent/catalyst medium which could integrate adsorption and catalytic incineration unit to simplify the control unit and maximize the energy efficiency. In this study, toluene (target VOC) adsorption/desorption tests over several adsorbents (hydrophobic zeolites and activated carbon) were carried out to select a good VOC adsorbent for a dual-functional adsorbent/catalyst medium. Hydrophobic zeolite HY was found to show high adsorption capacity and good desorption features, comparable to activated carbon and other hydrophobic zeolites with different structure. Therefore transition metal loaded zeolite HY was proposed as a dual functional adsorbent/catalyst medium. The Ag/HY catalyst among M/HY catalysts (M=Fe, Ni, Mn, Cu, Cr, Co, Ag) showed the lowest temperature for the complete conversion of toluene as measured by the temperature programmed surface reaction (TPSR). Therefore Ag/HY could be selected as a dual functional adsorbent/catalyst medium. Activity of Ag(6wt%)/HY catalyst for the deep oxidation of toluene increased with the Si/Al ratio of zeolite HY. Byproducts such as benzene, CO, and coke were produced during toluene oxidation over catalysts using zeolite HY with the low Si/Al ratio. Therefore zeolite HY(80) with the largest Si/Al ratio was favored as catalyst support for the deep oxidation of toluene. Activity of Ag/HY(80) catalyst for the deep oxidation of toluene increased with the Ag loading. The characterizations of Ag/HY(80) catalysts such as XRD (X-ray diffraction), TPR (temperature programmed reduction), $O_2-TPD$ (temperature programmed desorption), and XPS (X-ray photoelectron spectroscopy) were carried out to explain the nature of active center of Ag catalyst for deep oxidation of toluene. From these results, it could be inferred that the presence of metallic Ag phase seemed to play an important role to create silver oxide species or partially oxidized Ag surface onto the surface of metallic Ag phase under reaction condition (i.e. oxygen environment), and these silver oxide species might act as an active redox site during the oxidation reaction.

서지기타정보

서지기타정보
청구기호 {MCBE 04007
형태사항 vii, 79 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Jeong-Rang Kim
지도교수의 한글표기 : 임선기
지도교수의 영문표기 : Son-Ki Ihm
학위논문 학위논문(석사) - 한국과학기술원 : 생명화학공학과,
서지주기 참고문헌 : p. 73-79
주제 휘발성 유기화합물

제올라이트 Y
이원 기능 흡착/촉매제
톨루엔
VOLATILE ORGANIC COMPOUND (VOC)
SILVER
ZEOLITE Y
DUAL FUNCTIONAL ADSORBENT/CATALYST MEDIUM
TOLUENE
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