• Title/Summary/Keyword: Sol-Gel Method 졸-겔법

검색결과 222건 처리시간 0.03초

Preparation of CuO-CeO2 mixed oxide catalyst by sol-gel method and its application to preferential oxidation of CO (졸-겔법에 의한 CuO-CeO2 복합 산화물 촉매의 제조 및 CO의 선택적 산화반응에 응용)

  • Hwang, Jae-Young;Hahm, Hyun-Sik
    • Journal of the Korean Applied Science and Technology
    • /
    • 제34권4호
    • /
    • pp.883-891
    • /
    • 2017

  • For the preferential oxidation of CO contained in the fuel of polymer electrolyte membrane fuel cell (PEMFC), CuO-$CeO_2$ mixed oxide catalysts were prepared by the sol-gel and co-precipitation methods to replace noble metal catalysts. In the catalyst preparation by the sol-gel method, Cu/Ce ratio and hydrolysis ratio were changed. The catalytic activity of the prepared catalysts was compared with the catalytic activity of the noble metal catalyst($Pt/{\gamma}-Al_2O_3$). Among the catalysts prepared with different Cu/Ce ratios, the catalyst whose Cu/Ce ratio was 4:16 showed the highest CO conversion (90%) and selectivity (60%) at $150^{\circ}C$. As the hydrolysis ratio was increased in the catalyst preparation, surface area increased, and catalytic activity also increased. The highest CO conversions with the CuO-$CeO_2$ mixed oxide catalyst prepared by the co-precipitation method and the noble metal catalyst (1wt% $Pt/{\gamma}-Al_2O_3$) were 82 and 81% at $150^{\circ}C$, respectively, whereas the highest CO conversion with the CuO-$CeO_2$ mixed oxide catalyst prepared by the sol-gel method was 90% at the same temperature. This indicates that the catalyst prepared by the sol-gel method shows higher catalytic activity than the catalysts prepared by the co-precipitation method and the noble metal catalyst. From the CO-TPD experiment, it was found that the catalyst having CO desorption peak at a lower temperature ($140^{\circ}C$) revealed higher catalytic activity.

  • https://doi.org/10.12925/jkocs.2017.34.4.883 인용 PDF KSCI

Manufacture of Titania-silica Composite Anode Materials by Sol-gel Method (졸-겔법을 이용한 Titania-silica 혼합 음극활물질의 제조)

  • Bang, Jong-Min;Cho, Young-Im;Na, Byung-Ki
    • Clean Technology
    • /
    • 제16권2호
    • /
    • pp.140-144
    • /
    • 2010

  • Titania-silica composite materials were obtained by sol-gel method from TiCl4 and TEOS precusors, and they were applied to anode materials of lithium ion battery. Uniformly distributed composite materials can be manufactured by sol-gel method. The composite materials were heat treated by microwave to obtain materials with new properties. The experimental variables were composition of the material, heat treatment temperature, and microwave exposure. The structure and surface properties of the materials were analyzed by XRD, SEM, and the electrochemical capacity was measured with charge/discharge cycler.

  • https://doi.org/10.7464/ksct.2010.16.2.140 인용 PDF KSCI

Structural and Thermal Characteristics of Synthesized SiC by Carbothermal Reaction and Sol-gel Method (Carbothermal 반응법과 졸-겔법에 의해 합성된 SiC의 구조적 특성과 열역학적 특성)

  • Oh, Won-Chun;Kim, Bum-Soo
    • Analytical Science and Technology
    • /
    • 제11권3호
    • /
    • pp.156-160
    • /
    • 1998

  • SiC is synthesized by sol-gel and carbothermal reaction method from various carbon sources and Si source and characterized through the results of DSC and XRD. More SiC has been formed in carbothermal reaction than sol-gel method. From the XRD results, the degree of formation of SiC increases in the order of petroleum cokes, activated carbon, artificial graphite all in two introduced methods. Based on the DSC data, the enthalpy values for the exothermic reaction decrease in the order of activated carbon, petroleum cokes, artificial graphite in carbothermal reaction methods, while those for the endothermic reactions increase in the reverse order. But, the enthalpy values for the exothermic reactions decrease in the order of petroleum cokes, activated carbon, artificial graphite in sol-gel methods.

  • PDF

Study on the Smoke Density Characteristics of Flame Retardant Sol Manufactured by a Sol-gel Method (졸-겔법으로 제조된 방염제졸의 연기밀도 특성에 관한 연구)

  • Cho, Kyeong-Rae;Lee, Chun-Ha;Kim, Si-Kuk
    • Fire Science and Engineering
    • /
    • 제31권3호
    • /
    • pp.11-18
    • /
    • 2017

  • In this study, a non-halogen type organic-inorganic hybrid flame retardant sol, which can impart flame resistance to synthesize silicate of inorganic material and silane coupling agent of organic material by a sol-gel method, were newly manufactured. The addition of flame retardant will prevent loss of life in a fire because smoke from the flammability of interior finishing materials used as the construction materials poses a major danger. The smoke density measurement standard based on flame retardant performance standards, experiments were conducted according to the test equipment and procedures of ASTM E 662. The non-flaming mode experiment and the flaming mode experiment were conducted to confirm the performance of the manufactured flame retardant sol. As a result, the manufactured flame retardant sol improved the physical properties and heat resistance of existing flame retardants, and decreased the smoke production of the fire. Therefore, it may be possible to reduce the damage caused by smoke and expand the applications to various interior finishing materials.

  • https://doi.org/10.7731/KIFSE.2017.31.3.011 인용 PDF KSCI HTML