서지주요정보
Removal of volatile organic compounds (VOCs) by photocatalytic reaction in fluidized bed reacotrs = 유동층 반응기에서 광촉매 반응을 이용한 휘발성유기화합물질 제거 연구
서명 / 저자 Removal of volatile organic compounds (VOCs) by photocatalytic reaction in fluidized bed reacotrs = 유동층 반응기에서 광촉매 반응을 이용한 휘발성유기화합물질 제거 연구 / Tak-Hyoung Lim.
저자명 Lim, Tak-Hyoung ; 임탁형
발행사항 [대전 : 한국과학기술원, 2004].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8015522

소장위치/청구기호

학술문화관(문화관) 보존서고

DCBE 04008

SMS전송

도서상태

이용가능

대출가능

반납예정일

초록정보

The photocatalytic degradation characteristics of trichloroethylene (TCE), acetone, and toluene have been determined in an annular flow type, an annulus fluidized bed, a circulating fluidized bed photoreactors. The effects of trichloroethylene (TCE) gas flow rate, relative humidity, $TiO_2$ film thickness, and UV light intensity on photodegradation of TCE have been determined in an annular flow type photoreactor. Phosgene and dichloroacetyl chloride formation could be controlled as a function of TCE gas flow rate and photodegradation of TCE decreased with increasing relative humidity. The optimum thickness of $TiO_2$ film was found to be approximately 5 ㎛ and the photocatalytic reaction rate of TCE increased with square root of UV light intensity. The decomposition of TCE by photocatalysis increases with decreasing initial TCE concentration and increasing gas-residence time. The effects of superficial gas velocity $(U_g)$, wavelength and intensity of ultraviolet (UV) light, oxygen and $H_{2}O$ concentration on the photocatalytic degradation of TCE (Trichloroethylene) over $TiO_2/SiO_2$ catalyst have been determined in an annulus fluidized bed photoreactor. The key factor in determining the performance of the annulus fluidized bed photoreactor is found to be an optimum superficial gas velocity $(U_g)$ that provides the optimum UV light transmit through the proper size of bubbles in the photoreactor. The degradation efficiency of TCE increases with light intensity but decreases with wavelength of the UV light and $H_2O$ concentration in the fluidized bed of $TiO_2/silica-gel$ photocatalyst. The optimum concentration of $O_2$ for TCE degradation is found to be approximately 10%. In addition, the effects of the initial TCE concentration, phase holdup ratio of gas and solid phases $(\epsilon_g /\epsilon_s)$, CuO loading on the photodegradation of TCE have been determined in an annulus fluidized bed photoreactor. The TCE photodegradation decreased with increasing the initial TCE concentration. The optimum conditions of the phase holdup ratio $(\epsilon_g/\epsilon_s)$ and CuO wt% for the maximum photodegradation of TCE was found to be 2.1 and 1.1 wt%, respectively. The light transmission increases exponentially with the bed voidage at superficial gas velocity above 1.3 times the minimum fluidizing velocity $(U_{mf})$ in the annulus fluidized bed photoreactor. The effects of gas velocity, annulus gap on solid $(\epsilon_s)$ and gas phase holdups $(\epsilon_g)$, UV light transmittance and photocatalytic reduction of TCE (trichloroethylene) over $TiO_2/silica$ gel photocatalyst have been determined in an annulus fluidized bed photoreactor. The optimum TCE reduction efficiency exhibits at $ε_s/\epsilon_g$ of 0.48, annulus gap of 8 mm and UV light transmittance around 0.20. The most pronounced effects on TCE conversion are found to be gas velocity $(U_g)$ and annular gap in the photoreactor. Therefore, an annulus fluidized bed photoreactor is an effective tool for TCE degradation over $TiO_2/silica$ gel with effcient utilization of photon energy. The effects of the ratio of $TiO_2/silica$ gel, superficial gas velocity $(U_g)$, solid circulation rate $(G_s)$, solid holdup $(\epsilon_s)$, initial trichloroethylene (TCE), acetone, toluene concentration, wavelength of UV light, reaction temperature and concentrations of $H_2O$ and $O_2$ on photodegradation of TCE, acetone, toluene over $TiO_2$/silica gel have been determined in a circulating fluidized bed (CFB) photoreactor. The conversion of TCE, acetone, toluene decreases with wavelength of UV light, initial concentration of TCE, acetone, toluene and $H_2O$ concentration in the CFB reactor. The optimum concentration of $O_2$ for TCE, acetone, toluene degradations are found to be approximately 9%, 10%, 7% in the CFB photoreactor, respectively. The CFB photoreactor system is an effective tool for high VOCs degradation and throughput of VOCs with efficient utilization of photon energy.

서지기타정보

서지기타정보
청구기호 {DCBE 04008
형태사항 x, 143 p. : 삽도 ; 26 cm
언어 영어
일반주기 Appendix : Raw data
저자명의 한글표기 : 임탁형
지도교수의 영문표기 : Sang-Done Kim
지도교수의 한글표기 : 김상돈
학위논문 학위논문(박사) - 한국과학기술원 : 생명화학공학과,
서지주기 Reference : p. 130-139
주제 FLUIDIZED BED
PHOTOCATALYTIC
VOLATILE ORGANIC COMPOUNDS
유동층
광촉매
휘발성 유기화합물질
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