• Title/Summary/Keyword: iso-butene

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Development of Catalytic Characteristics for Enhancement of Iso-Butene Yield in Isomerization of 1-butene (1-butene의 골격 이성질화 반응에 있어서의 Iso-butene 수율 제고를 위한 촉매 특성 개발)

  • Kim, Jin Gul
    • Applied Chemistry for Engineering
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    • v.8 no.2
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    • pp.191-196
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    • 1997
  • The isothermal reduction on $Pt/MoO_3/SiO_2$ at $50^{\circ}C$ demonstrates that the rate of hydrogen spillover is increased as calciantion temperature increases. That is due to the overlayer formation over the surface of Pt crystallites, investigated by TEM and CO chemisorption. It is known that reaction mechanism of skeletal isomerization of 1-butene into iso-butene is composed of 2 step such as formation of carbonium ion and isomerization of methyl group. It is expected that the increase of i-butene yield after calcination at $250^{\circ}C$ is due to increased rate of hydrogen spillover coming from first, overlayer formation over Pt surface and second, chlorine lessoning from $PtCl_x$ precursor.

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Effect of reduction Temperature on the Skeletal Isomerization of iso-butene over Pt/MoO3/SiO2 Catalyst (환원온도가 Pt/MoO3/SiO2 촉매에서 iso-butene 의 골격 이성질화반응에 미치는 영향)

  • Cho Sae Jung;Kim Seong Mi;Kim Dong Hei;Kim Seong-Soo;Kim Jin Gul
    • Proceedings of the KAIS Fall Conference
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    • 2004.11a
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    • pp.280-283
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    • 2004
  • Effect of H2 spillover rate as function of reduction temperature on reaction kinetics was evaluated. Reaction kinetics including yield, conversion, activation energy and selectivity of 1-butene isomerization over Pt/HxMoO/SiO were measured as reaction temperature was increased. While conversion of 1-butane was decreased, yield of iso-butene was increased. Two kinds of reaction mechanism were proposed from the change of selectivity as function of temperature.

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Effect of Hydrogen Spillover on the Skeletal Isomerization of $1-C_4H_8$ over $Pt/HxMoO_3/SiO_2$ ($Pt/HxMoO_3/SiO_2$ 촉매에서 수소 이동 현상이 $1-C_4H_8$의 골격 이성질화반응에 미치는 영향)

  • 김진걸
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.5 no.1
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    • pp.34-37
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    • 2004
  • Effect of $H_2$ spillover rate as functon of calcination temperature on reaction kinetics was evaluated. Reaction kinetics including yield, conversion and selectivity of 1-butene isomerization over $Pt/HxMoO_3/SiO_2$ were measured as reaction temperature was increased. While conversion of 1-butane was decreased, yield of iso-butene was increased. Two kinds of reaction mechanism were proposed from the change of selectivity as function of temperature.

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Characteristics of Heteropoly Acid Catalyst for the Synthesis of ETBE(Ethyl Tert-Butyl Ether) (ETBE(Ethyl Tert-Butyl Ether) 합성에 대한 헤테로폴리산 촉매의 특성)

  • Park, Nam-Cook;Shin, Jae-Soon;Seo, Seong-Gyu;Lim, Yeoung-Taek;Kim, Jae-Seung
    • Applied Chemistry for Engineering
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    • v.5 no.1
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    • pp.30-36
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    • 1994
  • Reaction characteristics and correlations between the acidic property and catalytic activity of heteropoly acid catalyst on ETBE synthesis as a gasoline octane enhancer were investigated. The amount of pyridine adsorbed on heteropoly acid catalyst and catalytic activity in the synthesis of ETBE showed a good correlation. But ammonia failed to show such a correlation because of the complex formation of ammonia adsorbed and transition metal ions. In the case of supported catalyst catalytic activity and product distribution were mainly affected by the adsorption characteristics of TBA or iso-butene.

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Antimicrobial Substances of Distilled Components from Mustard Seed (겨자 증류성분중의 항균성 물질)

  • 심기환;서권일;강갑석;문주석;김홍출
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.24 no.6
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    • pp.948-955
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    • 1995
  • To investigate the antimicrobial activities of mustard seed(Brassica juncea), a series of solbents were examined for extraction of antimicrobial substances from mustard seed and then antimicrobial substances were identified by simultaneous distillation extraction(SDE) and GC-MS methods. Water and methanol extracts of mustard seed showed antimicrobial activitries against experimental strains while those from hexane extract almost was not observed. The distilled components of mustard seed by SDE method showed strong antimicrobial activities, methanol extract of residues fraction exhibited a little, and water layer with the exception of distilled components showed no antimicrobiol activities. The 30 varieties of distilled components including 3 types of isothiocyanate such as 3-isothiocyanate-1-propene, 4-isothiocyanate-1-butene, and 3-isothiocyanatoethyl benzene were identified from mustard seed.

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