Full metadata record
DC Field | Value | Language |
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dc.contributor.advisor | 박융호 | - |
dc.contributor.author | 이배욱 | - |
dc.date.accessioned | 2020-04-13T17:06:24Z | - |
dc.date.available | 2020-04-13T17:06:24Z | - |
dc.date.issued | 2007-02 | - |
dc.identifier.uri | https://repository.hanyang.ac.kr/handle/20.500.11754/150047 | - |
dc.identifier.uri | http://hanyang.dcollection.net/common/orgView/200000406598 | en_US |
dc.description.abstract | Pd/C 촉매를 이용한 4-isobutylacetophenone (IBAP)의 수소화 반응으로 생성되는 1-(4-isobutylphenyl)ethanol (IBPE)은 Ibuprofen?합성을 위한 중간체이다. 그러나 생성된 IBPE는 과도한 반응 활성으로 인해 수소화분해반응(hydrogenolysis)현상으로 4-isobutylethylbenzene (IBEB)이 부산물로 생성된다. 본 연구에서는 Pd/C를 이용한 IBAP 수소화 반응 특성에 대하여 연구하였다. 반응에 사용되는 Pd 촉매는 precipitation & deposition (P&D)방식으로 제조하였으며 이를 이용한 각종 수소화 공정변수들에 대한 영향과 촉매 제조 조건의 변화를 주어 각각의 제조된 촉매에 대해 수소화 반응의 활성과 선택도를 비교하였다. 실험에서 제조되어 사용된 촉매들은 ICP-AES, Oxygen Hydrogen Titration Cycle, XRD, TEM을 이용하여 표면분석과 촉매 특성 조사를 행하였으며 그것들의 특정한 영향들을 IBAP의 수소화 반응 특성과 함께 설명하였다. 수소화 반응의 공정변수들 중에서도 온도 조건 변화가 hydrogenolysis 현상에 크게 영향을 주는 것을 확인하였다. 촉매 제조 시 Pd 전구체 수용액의 P&D 되는 온도가 높을수록 많은 양의 금속 입자들이 담지 되었으며 전구체 수용액의 농도가 높을수록 금속의 분산도가 증가하였다. 일반적으로 촉매의 분산도가 커질수록 hydrogenolysis 현상도 증가하였다. 과도한 반응 활성으로 인하여 발생하는 hydrogenolysis를 억제하여 IBPE의 선택도를 높이기 위한 방법으로 기존에 많이 사용되던 additive인 amine을 사용하지 않고 alkali metal인 Na을 직접 제조된 Pd/C 촉매에 promotion 시켜 수소화 반응에 사용하였다. 그 결과 0.5wt%의 Na promoted Pd/C을 이용하여 70℃에서 행한 IBAP의 수소화 반응에서 다른 함량의 Na promoted Pd/C들과 비교하여 제일 높은 반응 속도와 IBPE 선택도를 보였다.; 1-(4-isobutylphenyl)ethanol (IBPE), which was an intermediate for synthesis of Ibuprofen??, was hydrogenated by 4-isobutylaceto-phenone (IBAP) over Pd/C catalysts. IBAP was prepared from Friedel-Crafts acylation in laboratory prior to the hydrogenation. But the IBAP hydrogenation had its drawback since the produced IBPE was easily converted to 4-isobutylethylbenzene (IBEB) by hydrogenolysis due to excessive reaction activity. In this reaction the hydrogenation characteristics of IBAP over the prepared Pd/C have been investigated. The catalysts were prepared by precipitation & deposition method (P&D). The activity and product selectivity in IBAP hydrogenation were observed with changing the reaction conditions. And the catalysts were prepared from P&D by changing the preparation conditions and characterized. The prepared catalysts were characterized by surface analysis, such as, ICP-AES, Oxygen Hydrogen Titration cycle, XRD and TEM. And their specific effects were explained in reaction with the catalysts performance in IBAP hydrogenation. The severer hydrogenation reaction conditions were, the more hydrogenolysis occurred. Especially, reaction temperature mainly affected the formation of IBEB, the hydrogenolysis product. The Pd/C catalysts prepared at high temperature were more distributed on carbon surface. When the more condensed precursor was used for catalyst preparation, the metal dispersion was increased. Generally, The highly dispersed Pd caused the hydrogenolysis to be increased. In stead of previously used amine compound as an additive, Na metal was promoted on Pd/C with various content to increased the selectivity of IBPE. The reaction rate as well as the yield to IBPE was the highest when 0.5wt% Na promoted Pd/C was used in the hydrogenation at 70℃. | - |
dc.publisher | 한양대학교 | - |
dc.title | 침전법으로 제조된 Pd/C를 이용한 4-Isobutylacetophenone의 수소화 반응 특성 | - |
dc.title.alternative | Selective Hydrogenation Characteristics of 4-Isobutylacetophenone over the Prepared Pd/C Catalysts | - |
dc.type | Theses | - |
dc.contributor.googleauthor | 이배욱 | - |
dc.contributor.alternativeauthor | Lee, Bae-Wook | - |
dc.sector.campus | S | - |
dc.sector.daehak | 대학원 | - |
dc.sector.department | 정밀화학공학과 | - |
dc.description.degree | Master | - |
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