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Final Examination 2011

Final Examination 2011. 3A , 4A, 5A zeolites 는 차이에 대해서 설명하시요 ? Explain how to distinguish zeolite 3A, 4A and 5A. 5 points 2) 제올라이트 결정화 단계를 나타내는 S-shaped crystallization curve 에

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Final Examination 2011

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  1. Final Examination 2011 • 3A, 4A, 5A zeolites는 차이에 대해서 설명하시요? • Explain how to distinguish zeolite 3A, 4A and 5A. 5 points • 2) 제올라이트결정화 단계를 나타내는 S-shaped crystallization curve 에 • 관하여 기술 하시요.Explain S-shape crystallization curve in zeolite synthesis. 5 points • Mesoporousformation mechanism에 대해서 간단히 설명하시요. 5 points • Explain formation mechanism of Mesoporous materials in terms of corperative self-assembly process. • 아래 각각의 제올라이트의 구조 및 SBU(secondary builing unit) 에 대해서 간략하게 • 설명하고 ( 5 point) 아래의 질문에 답하시요. • 상온에서 아래의 제올라이트를 사용하여 물(H2O) 에소량 존재 하는 1-hexanol • 을 분리할려고 할때 • a. 아래의 제올라이트로 분리하기 위한 기준은 무엇인지? (10 pt) • b. hydrophilic or a hydrophobic zeolite개념을 사용하여 분리할 수 있는지? 있다면 이유는? (10pt) • c. 무슨 제올라이트가 가장적당한지, 이유는? (10 pt) • Type zeolite Pore dimensions (Å) • Na-A 4.1×4.1 • Silicalite-1 5.2×5.6 • H-ZSM-5 5.2×5.6 • All-silica Beta 6.4×7.0 • H-Beta 6.4×7.0

  2. 4. For the separation of the impurity 1-hexanol from an aqueous waste stream at room temperature a proposed solution suggests the use of zeolites. a. What are three adsorption criteria for this kind of zeolite application? (10 pt) b. Will you use a hydrophilic or a hydrophobic zeolite for this separation ? Why ? (10 pt) c. Which zeolite(s) has(have) your preference and why ? (10 point) d. Explain following zeolite structure and SBU. (IZA web site) (5 point) Type zeolite Pore dimensions (Å) Na-A 4.1×4.1 Silicalite-1 5.2×5.6 H-ZSM-5 5.2×5.6 All-silica Beta 6.4×7.0 H-Beta 6.4×7.0

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