서지주요정보
서로 다른 Ti 도입방법에 따른 Ti-MCM-41 촉매의 제조와 광촉매 성질에 관한 연구 = A study on the photocatalytic properties of Ti-MCM-41 catalysts synthesized by two different methods of Ti incorporation
서명 / 저자 서로 다른 Ti 도입방법에 따른 Ti-MCM-41 촉매의 제조와 광촉매 성질에 관한 연구 = A study on the photocatalytic properties of Ti-MCM-41 catalysts synthesized by two different methods of Ti incorporation / 최형욱.
저자명 최형욱 ; Choi, Hyung-Ouk
단체명 생명화학공학과
발행사항 [대전 : 한국과학기술원, 2002].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8012975

소장위치/청구기호

학술문화관(문화관) 보존서고

MCBE 02027

SMS전송

도서상태

이용가능

대출가능

반납예정일

초록정보

Ti-MCM-41 catalysts with variable Si/Ti ratios were synthesized by two different methods of Ti incorporation. The samples were characterized with XRD, $N_2$ adsorption, TEM, FT-IR and ESR. The photocatalytic degradation of 4-chlorophenol was carried out to investigate the photocatalytic activity of Ti-MCM-41 catalysts. Ti-MCM-41 (pre) catalysts, which were prepared by introducing the Ti precursor (titanium tetra-iso-propoxide, TTIP) during hydrothermal synthesis of MCM-41, showed a relatively low photocatalytic activity due to the isolated $Ti^{4+}$ in the silicate framework. On the other hand, Ti-MCM-41 (post) catalysts, which were prepared by incorporating the TTIP after the MCM-41 synthesis, showed a relatively high photocatalytic activity compared to Ti-MCM-41 (pre) catalysts. It seems that $TiO_2$ in Ti-MCM-41 (post) was located at an extra-framework position and/or on the wall of MCM-41. Among the Ti-MCM-41 (post) catalysts, the Ti-MCM-41 (post1) catalyst was prepared with calcined MCM-41 and the Ti-MCM-41 (post2) catalyst with dried MCM-41, respectively. It was observed that the Ti-MCM-41 (post2) catalysts were more active than the Ti-MCM-41 (post1) catalysts most probably due to different amount of exposed $TiO_2$. For the Ti-MCM-41 (post) catalyst with Si/Ti=2.5, the rutile phase of $TiO_2$ appeared only when the calcination temperature was high enough (∼850℃). Only the anatase phase was observed when the calcination temperature was below 750℃. The phase transformation from anatase to rutile, which generally occurs between 400℃ and 500℃ for $TiO_2$, must be suppressed due to the presence of MCM-41. It was found that the photocatalytic activity for the decomposition of 4-chlorophenol depended mainly on the surface area of catalysts. The poor activities of the Ti-MCM-41 catalysts calcined at 850℃ seemed to be not only due to the presence of rutile phase but also due to the low surface area.

서지기타정보

서지기타정보
청구기호 {MCBE 02027
형태사항 viii, 79 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Hyung-Ouk Choi
지도교수의 한글표기 : 임선기
지도교수의 영문표기 : Son-Ki Ihm
학과명칭변경 : 화학공학과에서 생명화학공학과로 변경됨(2002년부터)
학위논문 학위논문(석사) - 한국과학기술원 : 생명화학공학과,
서지주기 참고문헌 : p. 76-79
주제 광촉매
Ti-MCM-41
TiO2
photocatalytic degradation
Ti incorporation
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