[논문]Separation of <tex>$CO_2$</tex> and <tex>$N_2$</tex> with a NaY Zeolite Membrane under Various Permeation Test Conditions

Cho, Churl-Hee; Yeo, Jeong-Gu; Ahn, Young-Soo; Han, Moon-Hee; Hyun, Sang-Hoon

Separation of $CO_2$ and $N_2$ with a NaY Zeolite Membrane under Various Permeation Test Conditions 원문보기

Korean membrane journal, v.8 no.1, 2006년, pp.21 - 30

Cho, Churl-Hee (Functional Materials Research Center, Korea Institute of Energy Research) , Yeo, Jeong-Gu (Functional Materials Research Center, Korea Institute of Energy Research) , Ahn, Young-Soo (Functional Materials Research Center, Korea Institute of Energy Research) , Han, Moon-Hee (Functional Materials Research Center, Korea Institute of Energy Research) , Hyun, Sang-Hoon (Department of Ceramic Engineering, Yonsei University)

Abstract ▼ AI-Helper

A faujasite NaY zeolite membrane was prepared on a tubular ${\alpha}-Al_2O_3$ support by the secondary growth process, and effects of permeation test conditions on the $CO_2/N_2$ separation were investigated. A NaY zeolite membrane with good $CO_2/N_2$ separation was successfully synthesized by using the hydrothermal solution ($Al_2O_3:SiO_2:Na_2O:H_2O$ = 1:6:14:840 in a molar base): at a permeation temperature of $30^{\circ}C$, its $CO_2$ permeance and $CO_2/N_2$ separation factor were $2.5{\times}10^{-7}mol/m^2secPa$ and 34, respectively. The $CO_2$ and $N_2$ permeations were highly dependent on permeation test conditions (feed composition, feeding rate, feed pressure, He sweeping rate and permeation temperature). The results indicated that (i) $CO_2$ and $N_2$ permeations through NaY zeolite membrane are governed by surface and micropore diffusions, respectively, (ii) the preparation of NaY zeolite membrane with a large permeating area is one of the most difficult hurdles for its real applications, and (iii) the retardation of $N_2$ permeation is an effective key to improve $CO_2/N_2$ separation factor in NaY zeolite membrane.

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가설 설정

CO₂ and N₂ permeances were calculated from the CO₂ and N₂ fluxes, the molar ratio of CO₂ to N₂ in feed side, and the feed pressure. The three following as sumptions were applied to the permeance calculations in CO₂-N₂ binary component system: (i) the temper ature of permeate gas introduced to the digital bubble flow meter (DBF) doesn't be affected by furnace tem perature and is equal to room temperature, (ii) He car rier gas doesn't affect CO₂ and N₂ permeations through membrane, and (iii) CO₂ and N₂ partial pressures in permeate side is zero.
3. CO₂/N₂ separation factor decreased as permeation temperature increased. Therefore, to improve separation factor at elevated temperatures, it is necessary to develop a technique to retard N₂ permeation through NaY zeolite membrane at elevated temperatures.

제안 방법

Crystalline phase and morphology of zeolite mem branes were analyzed by X-ray diffractometer (D/max 2000-Ultima^Plus Rigaku, Japan) and scanning electron microscopy (XL30, Philips, Holland), respectively. In the morphology observations using SEM, the molar ra tio of Si to Al in zeolite membrane was evaluated by EDS analysis.

대상 데이터

68. The grown zeolite crystals were faujasite NaY zeolite crystals.

성능/효과

1) Carbon dioxide and nitrogen permeations through NaY zeolite membrane were governed by surface diffusion and micropore diffusion mechanisms, respectively, at permeation temperatures of less than 100℃.

참고문헌 (15)

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Separation of $CO_2$ and $N_2$ with a NaY Zeolite Membrane under Various Permeation Test Conditions 원문보기

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Separation of $CO_2$ and $N_2$ with a NaY Zeolite Membrane under Various Permeation Test Conditions 원문보기

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