서지주요정보
마그네슘옥사이드담지 금속산화물촉매상에서 HFC-134a와 HCFC-1122 혼합물의 선택적 산화반응에 관한 연구 = A study on the selcetive oxidation of HFC-134a and HCFC-1122 mixture over MgO-supported metal oxide catalysts
서명 / 저자 마그네슘옥사이드담지 금속산화물촉매상에서 HFC-134a와 HCFC-1122 혼합물의 선택적 산화반응에 관한 연구 = A study on the selcetive oxidation of HFC-134a and HCFC-1122 mixture over MgO-supported metal oxide catalysts / 천영민.
저자명 천영민 ; Cheon, Young-Min
발행사항 [대전 : 한국과학기술원, 2000].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8011150

소장위치/청구기호

학술문화관(문화관) 보존서고

MCHE 00030

SMS전송

도서상태

이용가능

대출가능

반납예정일

초록정보

1,1,1,2-Tetrafluoroethane(HFC-134a) has been known to haveno ozone depletion potential(ODP) and is a prime candidate for thereplacement of dichlorodifluoromethane(CFC-12) used as a refrigerant,medical aerosols, and foam blowing agents. Industrial synthesis of HFC-134a includes the formation of toxic 1-chloro-2,2-diflouroethylene (HCFC-1122) as a by-product. Metal oxide catalysts, CuO, $V_2O_5$, $Cr_2O_3$, $Fe_2O_3$, and AgO were supported on MgO, and they were screened to remove HCFC-1122 from HCFC-1122 /HFC-134a mixture without changing HFC-134a through new type of the catalytic selective oxidation as a non-conventional reaction route. HCFC-1122 was converted to its oxidation products such as CO, $CO_2$, $COF_2$, HCl, and HF, which can be easily separated from HFC-134a. The activity for HCFC-1122 in HFC-134a and HCFC-1122 mixture increased in the order of $Cr_2O_3$/MgO > CuO/MgO > $V_2O_5$/MgO. The conversion for oxidation of HCFC-1122 alone was relatively higher than that of HFC-134a alone. The reactivity of HFC-134a and HCFC-1122mixture did not show any deviation from the prediction based on the reactivity of each reactant alone. The amount of oxygen is an important factor in the deactivation of catalysts since coke formation is accelerated through halogenated acetylene formed during the reaction. A higher $O_2$/HCFC-1122 ratio showed a higher activity while a lower $O_2$/HCFC-1122 ratio showed a rapid deactivation with all catalysts for removal of HCFC-1122. CuO/MgO, $V_2O_5$/MgO, and $Cr_2O_3$/MgO catalysts showed a high activity around 90% near 500℃. Catalysts calcined at a lower temperature showed a higher activity for HCFC-1122 than those at a higher temperature. Calcination at a higher temperature caused a significant sintering, leading to the decrease in surface area as well as in oxygen uptake.

서지기타정보

서지기타정보
청구기호 {MCHE 00030
형태사항 x, 80 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Young-Min Cheon
지도교수의 한글표기 : 임선기
지도교수의 영문표기 : Son-Ki Ihm
학위논문 학위논문(석사) - 한국과학기술원 : 화학공학과,
서지주기 참고문헌 : p. 75-80
주제 선택적산화반응
금속산화물촉매
마그네슘옥사이드
오존층
대체물질
HFC-134a
HCFC-1122
Magnesium oxide
Selective oxidation
Metal oxide
QR CODE qr code