• Bulletin of the Korean Chemical Society
• /
• 제25권3호
• /
• pp.347-348
• /
• 2004

• Bulletin of the Korean Chemical Society
• /
• 제24권10호
• /
• pp.1425-1426
• /
• 2003

• Bulletin of the Korean Chemical Society
• /
• 제25권10호
• /
• pp.1451-1452
• /
• 2004

• 한국신재생에너지학회:학술대회논문집
• /
• 한국신재생에너지학회 2007년도 춘계학술대회
• /
• pp.33-36
• /
• 2007

Currently, many structured catalysts using microchannel are researched to apply to fuel reforming. In this paper, ceramic monolith and metal mesh as structured catalysts are investigated for catalytic autothermal reforming. When GHSV increases, each structured catalyst has better performances(hydrogen production, fuel conversion) than packed bed catalyst for autothermal reforming. The major causes seem to be the elevated heat and mass transfer, gas phase reaction and redistribution of packed bed due to high pressure drop.

• 한국콘텐츠학회논문지
• /
• 제18권7호
• /
• pp.245-252
• /
• 2018

상이동 촉매기법을 기반으로 한 rose bengal 시약은 중성이나 염기성 용액에서 녹지 않는 난용성 염을 형성하는 칼슘을 타겟팅하는 시약으로, 물에 젖은 검체에서 잠재지문 현출시 효과적일 것으로 기대되어 최근 연구가 이루어지고 있다. 그러나 그 동안 선행연구에서는 rose bengal 시약으로 현출된 지문의 형광 특성을 관찰하지 않았을 뿐만 아니라 제시된 시약의 제조법 또한 최적 현출 조건인지 검토되지 않았다. 이에 본 연구는 rose bengal 염료의 최대방출형광을 바탕으로 rose bengal염료와 상이동촉매제(Tetrabutylammonium)의 농도를 달리하여 최적의 시약 조성을 찾고자 하였다. 그 결과 rose bengal과 상이동촉매제의 농도가 각 0.01 M: 0.008 M일 때 가장 효과적인 것을 확인할 수 있었다.

• 공업화학
• /
• 제3권1호
• /
• pp.72-80
• /
• 1992

상이동촉매를 사용하여 Group 6의 $M(CO)_4$(2, 2'-bipyridine)[M=Cr, Mo, W]을 $M(CO)_6$의 CO 리간드를 2개의 비공유 전자쌍 주게인 2, 2'-bipyridine으로 치환하여 합성할 때 촉매의 종류와 용매가 생성물의 수율에 미치는 영향을 고찰하였다. 촉매는 형태, 중심양이온 및 음이온의 종류, 양이온에 결합된 알킬기와 아릴기의 종류, 그리고 사슬길이가 다른 다양한 촉매를 사용하였다.

• 한국정보디스플레이학회:학술대회논문집
• /
• 한국정보디스플레이학회 2002년도 International Meeting on Information Display
• /
• pp.724-727
• /
• 2002

2,7-dibromo-9, 9-dialkyl-substituted-fluorene derivatives were prepared by the alkylation of 2,7-dibromofluorene with various alkyl groups under two-phase phase transfer catalysis (PTC) conditions, as monomers for synthesizing poly(dialkylfluorene)s. Tetra-nbutylammonium hydrogen sulfate (TBAHS) was used as a phase transfer catalyst to enhance nucleophilic substitution. In addition, NaOH in water (25M) was used as a base to generate anions. Compared to conventional alkylation using butyllithium(BuLi), the reaction using the PTC technique attained high selectivity and substantial conversion of reactants, due to the enhanced reaction rate, while the reaction was carried out under moderate conditions. An approximately 90% yield was obtained from the reaction and the reaction time was remarkably reduced. 2,7-dibromo-9,9-dihexyl-fluorene, 2,7-dibromo-9,9-dioctyl-fluorene, and 2,7-dibromo-9,9-di(2-ethylhexyl)-fluorene were effectively synthesized by phase transfer catalytic reaction.

• Bulletin of the Korean Chemical Society
• /
• 제27권6호
• /
• pp.857-862
• /
• 2006

The catalytic enantioselective Michael reaction promoted by quaternary ammonium salts from Cinchona alkaloids as a phase-transfer catalyst is described. Treatment of malonates with $\alpha$,$\beta$-unsaturated ketones under mild reaction conditions afforded the corresponding Michael adducts in good yields with good to moderate enantiomeric excesses.

• 대한방사성의약품학회지
• /
• 제3권2호
• /
• pp.116-121
• /
• 2017

To overcome the low reactivity and solubility of alkali metal fluorides (MFs), various types of phase transfer catalysts (PTCs) have been developed over the last decades. However, since the fluoride activated by such PTC sometimes has a strong basicity, it may cause various side reactions such as elimination reaction or hydroxylation reaction in the nucleophilic fluorination reaction. Also, they may cause separation problems in the compound purification process. In recent advanced study, various PTCs have been developed to solve these problem of conventional catalyst. In this review, we would like to introduce three kinds of novel multifunctional organic catalysts such as bis-tert-alcohol-functionalized crown-6-calix[4]arene (BACCA), easy separable pyrene-tagged ionic liquid (PIL) by reduced graphene oxide (rGO), and tri-tert-butanolamine organic catalyst.

• 한국산업융합학회 논문집
• /
• 제6권3호
• /
• pp.171-176
• /
• 2003

The poly(triazine bissulfide) synthesized from 6-dibutylamino-1,3,5-triazine-2,4-dithiol with bis(4-chloro-3-nitrophenyl) sulfone in the presence of the phase transfer catalyst, the maximum algebra viscosity (0.57 dL/g) is stable at reaction temperature of $60^{\circ}C$ overall. We could not acquire the good result about solubility, thermal property, and molecular weight to make cast film, we made base for the synthesis of functionalization polymer material.