Clean Technology (청정기술)

The Korean Society of Clean Technology (한국청정기술학회)
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A Study on the Modification of NH4+Y-zeolite for Improving Adsorption/Desorption Performance of Benzene

NH4+Y-zeolite의 개질을 통한 벤젠 흡·탈착 성능 증진 연구

  • Jang, Young Hee (Department of Environmental Energy Engineering, Graduate School of Kyonggi University) ;
  • Noh, Young Il (Department of Environmental Energy Engineering, Graduate School of Kyonggi University) ;
  • Lee, Sang Moon (Department of Environmental Energy Engineering, Kyonggi University) ;
  • Kim, Sung Su (Department of Environmental Energy Engineering, Kyonggi University)
  • 장영희 (경기대학교 일반대학원 환경에너지공학과) ;
  • 노영일 (경기대학교 일반대학원 환경에너지공학과) ;
  • 이상문 (경기대학교 환경에너지공학과) ;
  • 김성수 (경기대학교 환경에너지공학과)
  • Received : 2018.11.14
  • Accepted : 2019.01.02
  • Published : 2019.03.30
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Abstract

A.C (activated carbon) is mainly used to remove VOCs (volatile organic compounds), however, it has many problems such as fire risk due to increasing of adsorbent surface temperature during VOCs ad/desorption, increased cost by frequent replacement cycles requirement and performance degradation when containing moisture. In order to solve these problems, many researches, hydrophobic zeolite adsorbents, have been reported. In this study, $NH_4{^+}Y$-zeolite was synthesized with Y-zeolite through steam treatment and acid treatment, which is one of the hydrophobic modification methods, to secure high surface area, thermal stability and humidity resistance. The Y, Y-550-HN, Y-600-HN and Y-650-HN had adsorption capacities of $23mg\;g^{-1}$, $38mg\;g^{-1}$, $77mg\;g^{-1}$, $61mg\;g^{-1}$. The change of Si/Al ratio, which is an index to confirm the degree of modification, was confirmed by XRF (X-ray fluorescence spectrometer) analysis. As a result, the adsorbtion performance was improved when Y-zeolite modified, and the Si/Al ratio of Y, Y-550-HN, Y-600-HN, Y-650-HN were increased to 3.1765, 6.6706, 7.3079, and 7.4635, respectively. Whereas it was confirmed that structural crystallization due to high heat treatment temperature affected performance degradation. Therefore, there is an optimal heat treatment temperature of Y-zeolite, optimum modification condition study could be a substitute for activated carbon as a condition for producing an adsorbent having high durability and stability.

활성탄(activated carbon, A.C)은 휘발성 유기화합물(volatile organic compounds, VOCs) 제거를 위해 가장 많이 사용되고 있지만 흡/탈착 시 열화현상으로 인한 화재위험성, 잦은 교체 주기로 인한 비용 부담, 수분에 의한 성능 저하 등의 문제점을 가지고 있다. 이러한 문제들을 해결하기 위하여 소수성 제올라이트 흡착제가 연구되고 있다. 본 연구에서는 소수성 개질법 중 하나인 수증기처리 및 산 처리를 통해 $NH_4{^+}Y$-zeolite를 소수성 Y-zeolite로 합성하여 높은 표면적, 열적 안정성과 습도저항성을 확보하고자 하였다. Y-zeolite와 개질된 Y-550-HN, Y-600-HN, Y-650-HN의 흡착성능은 23, 38, 77, $61mg\;g^{-1}$으로 나타났으며, 소수성 개질 정도를 확인할 수 있는 지표인 Si/Al ratio 변화를 XRF 분석으로 확인하였다. 그 결과, Y-zeolite를 개질하였을 때 흡착성능이 증진되었고, Si/Al 비는 Y, Y-550-HN, Y-600-HN, Y-650-HN 순으로 각각 3.1765, 6.6706, 7.3079, 7.4635 임을 확인하였다. 반면에 높은 열처리 온도에 의한 구조적 결정화가 성능 저하에 영향을 미칠 수 있음을 확인하였다. 반면에 Y-zeolite의 최적 열처리 온도가 존재하며, 이와 같은 최적 개질 조건 연구는 높은 내구성과 안정성을 갖는 흡착제를 제조할 수 있는 조건으로써 향후 활성탄을 대체할 수 있을 것으로 판단하였다.

Keywords

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Figure 1. Nitrogen oxide photochemical mechanism (a) typical or (b) involving VOCs.

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Figure 3. Schematic diagram of zeolite adsorption tower apparatus.

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Figure 2. Preparation procedure of hydrophobic Y-zeolite.

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Figure 4. Adsorption performance of different steam temperature on the Y, Y-550-HN, Y-600-HN, Y-650-HN (conditions: 35% R.H., 250 ppm benzene, 400 mL min-1 flow, absorbent: 0.1 g).

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Figure 5. XRD patterns of Y, Y-550-HN, Y-600-HN and Y-650-HN.

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Figure 6. Pore size distribution of Y, Y-550-HN, Y-600-HN and Y-650-HN.

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Figure 7. Re-adsorption of benzene over Y-600-HN (conditions : 0% R.H., 250 ppm benzene, 400 mL min-1 flow, absorbent : 0.05 g).

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Figure 8. Desorption performance of benzene with different flow rate (conditions : 0% R.H., absorbent : 0.05 g).

Table 1. XRF analysis of Y, Y-550-HN, Y-600-HN, Y-650-HN

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Table 2. Surface area, pore volume and average pore size of Y, Y-550-HN, Y-600-HN, Y-650-HN

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Table 3. Desorption amounts of benzene with different flow rate

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