청정기술 (Clean Technology)

  • 제24권4호
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  • Pages.280-286
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  • 2018
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  • 1598-9712(pISSN)
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  • 2288-0690(eISSN)
한국청정기술학회 (The Korean Society of Clean Technology)
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TiO2와 Al2O3의 기상 VOCs 흡착 특성 평가 및 다양한 구조체로의 성형을 통한 열적 내구성 확보에 관한 연구

A Study on the Evaluation of Adsorption Characteristics of VOCs on TiO2 and Al2O3 and Investigation of the Thermal Durability by Molding Various Structures

  • 황인혁 (경기대학교 일반대학원 환경에너지공학과) ;
  • 이상문 (경기대학교 환경에너지공학과) ;
  • 김성수 (경기대학교 환경에너지공학과)
  • Hwang, In-Hyuck (Department of Environmental Energy Engineering, Graduate school of Kyonggi University) ;
  • Lee, Sang Moon (Department of Environmental Energy Systems Engineering, Kyonggi University) ;
  • Kim, Sung Su (Department of Environmental Energy Systems Engineering, Kyonggi University)
  • 투고 : 2018.07.07
  • 심사 : 2018.07.26
  • 발행 : 2018.12.31
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초록

본 연구에서는 금속산화물 2종, $TiO_2$ 분말과 $Al_2O_3$ 분말을 이용하여 건식 조건에서의 기상 VOCs 흡착 성능을 평가하였으며, BET분석과 암모니아 in-situ FT-IR 분석을 통해 비표면적, 표면 산점을 분석하고 성능과의 상관성을 평가하였다. 그 결과 $TiO_2$ 분말, $Al_2O_3$ 분말은 각각 $317.6m^2\;g^{-1}$, $64m^2\;g^{-1}$의 비표면적을 갖으며, $TiO_2$ 분말의 경우 표면에 다수의 산점이 관찰되었다. 두 금속 산화물 분말을 이용하여 기상 VOCs 흡착 성능을 평가한 결과, 비표면적이 크고 다수의 산점을 보유한 $TiO_2$ 분말이 비교적 우수한 흡착 성능을 나타내었다. 특히 비표면적이 흡착성능에 직접적인 영향을 미치는 것으로 판단되며, 산점에 의한 영향에 대해서는 추가적인 연구가 요구된다. 우수한 흡착 성능을 나타낸 $TiO_2$를 기반으로 honeycomb, hollow fiber, disc의 성형체로 제조 한 결과, 분말보다 흡착 성능은 낮았으나 적용성 측면에서 유리하며 제조공정의 특성상 우수한 열적 내구성을 갖는 polymeric disc 흡착제의 경우, 수회의 고온 탈착공정 후에도 흡착 성능을 안정적으로 유지함을 확인하였다.

In this study, the adsorption performance of vapor phase VOCs under dry conditions was evaluated by using two metal oxides, $TiO_2$ powder and $Al_2O_3$ powder. BET analysis and ammonia in-situ FT-IR analysis were used to analyze specific surface area and surface acid site. As a result, $TiO_2$ powder and $Al_2O_3$ powder had a specific surface area of $317.6m^2\;g^{-1}$ and $64m^2\;g^{-1}$, respectively. In the case of $TiO_2$ powder, many acid sites were observed on the surface. As a result of evaluating the vapor phase VOCs adsorption performance using two metal oxide powders, $TiO_2$ powder having a relatively large specific surface area and a large number of acid sites exhibited relatively good adsorption performance. In particular, it is considered that the specific surface area directly affects the adsorption performance, and further study on the effect of the acid site is required. Based on the $TiO_2$ exhibited excellent adsorption performance, it manufactured into various forms of honeycomb, hollow fiber and disc. As a result, the adsorption performance was lower than that of the powder, but it is advantageous in view of applicability. In addition, it was confirmed that the disc adsorbent having excellent thermal durability due to the characteristics of the manufacturing process stably maintains adsorption performance even at a high temperature desorption process several times.

키워드

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Figure 1. Schematic of adsorption test reactor.

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Figure 2. Comparison of adsorption performance of VOCs between TiO2 powder and Al2O3 powder.

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Figure 3. Ammonia in situ FT-IR analysis results of TiO2 powder and Al2O3 powder.

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Figure 4. Comparison of VOCs adsorption performance of various form of TiO2-based adsorbents.

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Figure 5. SEM analysis results of various type of TiO2-based adsorbents

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Figure 6. SEM analysis results of activated carbon before and after heat treatment.

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Figure 7. Performance comparison of activated carbon before and after heat treatment.

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Figure 8. Performance comparison of TiO2 disc before and after heat treatment.

Table 1. BET analysis results of TiO2 powder and Al2O3 powder

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Table 2. Adsorption amount of VOCs adsorbed per unit weight of various type of TiO2-based adsorbents

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Table 3. Comparison of weight of activated carbon before and after heat treatment

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