The Experts below are selected from a list of 46167 Experts worldwide ranked by ideXlab platform

King Lun Yeung - One of the best experts on this subject based on the ideXlab platform.

  • an investigation of knoevenagel Condensation Reaction in microreactors using a new zeolite catalyst
    Applied Catalysis A-general, 2004
    Co-Authors: Xiongfu Zhang, R M Martinaranda, King Lun Yeung
    Abstract:

    Abstract New basic zeolite catalysts obtained by grafting amino groups onto NaX and CsNaX zeolites exhibit excellent catalytic activities for Knoevenagel Condensation Reaction between benzaldehyde and ethyl cyanoacetate (ECA), ethyl acetoacetate (EAA) and diethyl malonate (DEM). The CsNaX-NH 2 catalyst also displays higher conversion compared to aminopropylated MCM-41. Knoevenagel Condensation Reaction in a CsNaX zeolite microreactor performed better than the traditional packed bed reactor (PBR) with an order of magnitude higher productivity (i.e. moles ethyl 2-cyano-3 phenylacrylate produced per hour for each gram catalyst). A nearly fourfold increase in Reaction conversion was obtained for the microreactor when CsNaX-NH 2 catalyst was used. A membrane microreactor was obtained by incorporating a water-selective, NaA membrane to the multi-channel microreactor. The selective removal of water byproduct during the Reaction led to a 25% improvement in Reaction conversion for both catalysts.

  • an investigation of knoevenagel Condensation Reaction in microreactors using a new zeolite catalyst
    Applied Catalysis A-general, 2004
    Co-Authors: Xiongfu Zhang, R M Martinaranda, King Lun Yeung
    Abstract:

    Abstract New basic zeolite catalysts obtained by grafting amino groups onto NaX and CsNaX zeolites exhibit excellent catalytic activities for Knoevenagel Condensation Reaction between benzaldehyde and ethyl cyanoacetate (ECA), ethyl acetoacetate (EAA) and diethyl malonate (DEM). The CsNaX-NH 2 catalyst also displays higher conversion compared to aminopropylated MCM-41. Knoevenagel Condensation Reaction in a CsNaX zeolite microreactor performed better than the traditional packed bed reactor (PBR) with an order of magnitude higher productivity (i.e. moles ethyl 2-cyano-3 phenylacrylate produced per hour for each gram catalyst). A nearly fourfold increase in Reaction conversion was obtained for the microreactor when CsNaX-NH 2 catalyst was used. A membrane microreactor was obtained by incorporating a water-selective, NaA membrane to the multi-channel microreactor. The selective removal of water byproduct during the Reaction led to a 25% improvement in Reaction conversion for both catalysts.

  • Knoevenagel Condensation Reaction in zeolite membrane microreactor
    Microporous and Mesoporous Materials, 2003
    Co-Authors: Sau Man Lai, Rosa M. Martín-aranda, King Lun Yeung
    Abstract:

    The performance of a membrane microreactor was tested and compared with that of a microreactor, a packed bed reactor (PBR) and a packed bed membrane reactor (PBMR) for the Knoevenagel Condensation Reaction of benzaldehyde and ethyl cyanoacetate to produce ethyl 2-cyano-3-phenylacrylate. Cs-exchanged NaX faujasite zeolite was used as the base catalyst for this equilibrium-limited Reaction. Hydrophilic ZSM-5 membranes were employed in both the membrane microreactor and the PBMR for the selective removal of water byproduct from the Reaction. The product yield per pass was low for the packed bed reactor. Higher yields were observed for the microreactor and PBMR, but the best performance belongs to the membrane microreactor, which displayed both supra-equilibrium conversion and better product purity. (C) 2003 Elsevier Inc. All rights reserved

Krishnapillai Sreekumar - One of the best experts on this subject based on the ideXlab platform.

  • Polycarbosilane-supported titanium(IV) catalyst for Knoevenagel Condensation Reaction
    Applied Organometallic Chemistry, 2012
    Co-Authors: Kunniyur Mangala, Krishnapillai Sreekumar
    Abstract:

    Polycarbosilane (PCS) was synthesized by the polyCondensation of trichloromethylsilane and trimethoxyvinylsilane in the presence of sodium metal. PCS has a highly crosslinked structure, high ceramic yield and high surface area. Titanium metal ion was attached to the polycarbosilane and its catalytic activity was investigated. The Knoevenagel Condensation Reaction catalysed by titanium-incorporated polycarbosilane is reported. The titanium-incorporated PCS catalysed the Reaction well and with a diverse set of substrates the Reaction proceeded with good yield. PCS-supported transition metal catalysts have been prepared for the first time and used successfully in the Knoevenagel Condensation Reaction. Copyright © 2012 John Wiley & Sons, Ltd.

  • Polycarbosilane‐supported titanium(IV) catalyst for Knoevenagel Condensation Reaction
    Applied Organometallic Chemistry, 2012
    Co-Authors: Kunniyur Mangala, Krishnapillai Sreekumar
    Abstract:

    Polycarbosilane (PCS) was synthesized by the polyCondensation of trichloromethylsilane and trimethoxyvinylsilane in the presence of sodium metal. PCS has a highly crosslinked structure, high ceramic yield and high surface area. Titanium metal ion was attached to the polycarbosilane and its catalytic activity was investigated. The Knoevenagel Condensation Reaction catalysed by titanium-incorporated polycarbosilane is reported. The titanium-incorporated PCS catalysed the Reaction well and with a diverse set of substrates the Reaction proceeded with good yield. PCS-supported transition metal catalysts have been prepared for the first time and used successfully in the Knoevenagel Condensation Reaction. Copyright © 2012 John Wiley & Sons, Ltd.

Thanh Binh Nguyen - One of the best experts on this subject based on the ideXlab platform.

Kunniyur Mangala - One of the best experts on this subject based on the ideXlab platform.

  • Polycarbosilane-supported titanium(IV) catalyst for Knoevenagel Condensation Reaction
    Applied Organometallic Chemistry, 2012
    Co-Authors: Kunniyur Mangala, Krishnapillai Sreekumar
    Abstract:

    Polycarbosilane (PCS) was synthesized by the polyCondensation of trichloromethylsilane and trimethoxyvinylsilane in the presence of sodium metal. PCS has a highly crosslinked structure, high ceramic yield and high surface area. Titanium metal ion was attached to the polycarbosilane and its catalytic activity was investigated. The Knoevenagel Condensation Reaction catalysed by titanium-incorporated polycarbosilane is reported. The titanium-incorporated PCS catalysed the Reaction well and with a diverse set of substrates the Reaction proceeded with good yield. PCS-supported transition metal catalysts have been prepared for the first time and used successfully in the Knoevenagel Condensation Reaction. Copyright © 2012 John Wiley & Sons, Ltd.

  • Polycarbosilane‐supported titanium(IV) catalyst for Knoevenagel Condensation Reaction
    Applied Organometallic Chemistry, 2012
    Co-Authors: Kunniyur Mangala, Krishnapillai Sreekumar
    Abstract:

    Polycarbosilane (PCS) was synthesized by the polyCondensation of trichloromethylsilane and trimethoxyvinylsilane in the presence of sodium metal. PCS has a highly crosslinked structure, high ceramic yield and high surface area. Titanium metal ion was attached to the polycarbosilane and its catalytic activity was investigated. The Knoevenagel Condensation Reaction catalysed by titanium-incorporated polycarbosilane is reported. The titanium-incorporated PCS catalysed the Reaction well and with a diverse set of substrates the Reaction proceeded with good yield. PCS-supported transition metal catalysts have been prepared for the first time and used successfully in the Knoevenagel Condensation Reaction. Copyright © 2012 John Wiley & Sons, Ltd.

Sau Man Lai - One of the best experts on this subject based on the ideXlab platform.

  • Knoevenagel Condensation Reaction in zeolite membrane microreactor
    Microporous and Mesoporous Materials, 2003
    Co-Authors: Sau Man Lai, Rosa M. Martín-aranda, Lun Yeung
    Abstract:

    The performance of a membrane microreactor was tested and compared with that of a microreactor, a packed bed reactor (PBR) and a packed bed membrane reactor (PBMR) for the Knoevenagel Condensation Reaction of benzaldehyde and ethyl cyanoacetate to produce ethyl 2-cyano-3-phenylacrylate. Cs-exchanged NaX faujasite zeolite was used as the base catalyst for this equilibrium-limited Reaction. Hydrophilic ZSM-5 membranes were employed in both the membrane microreactor and the PBMR for the selective removal of water byproduct from the Reaction. The product yield per pass was low for the packed bed reactor. Higher yields were observed for the microreactor and PBMR, but the best performance belongs to the membrane microreactor, which displayed both supra-equilibrium conversion and better product purity.

  • Knoevenagel Condensation Reaction in zeolite membrane microreactor
    Microporous and Mesoporous Materials, 2003
    Co-Authors: Sau Man Lai, Rosa M. Martín-aranda, King Lun Yeung
    Abstract:

    The performance of a membrane microreactor was tested and compared with that of a microreactor, a packed bed reactor (PBR) and a packed bed membrane reactor (PBMR) for the Knoevenagel Condensation Reaction of benzaldehyde and ethyl cyanoacetate to produce ethyl 2-cyano-3-phenylacrylate. Cs-exchanged NaX faujasite zeolite was used as the base catalyst for this equilibrium-limited Reaction. Hydrophilic ZSM-5 membranes were employed in both the membrane microreactor and the PBMR for the selective removal of water byproduct from the Reaction. The product yield per pass was low for the packed bed reactor. Higher yields were observed for the microreactor and PBMR, but the best performance belongs to the membrane microreactor, which displayed both supra-equilibrium conversion and better product purity. (C) 2003 Elsevier Inc. All rights reserved