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Aldol Condensation

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Chun Cai – One of the best experts on this subject based on the ideXlab platform.

Tao Zhang – One of the best experts on this subject based on the ideXlab platform.

  • kinetic study of retro Aldol Condensation of glucose to glycolaldehyde with ammonium metatungstate as the catalyst
    Aiche Journal, 2014
    Co-Authors: Junying Zhang, Baolin Hou, Aiqin Wang, Hua Wang, Tao Zhang
    Abstract:

    The kinetics of the retro-Aldol Condensation of glucose to glycolaldehyde was studied in a batch reactor at 423-453 k using ammonium metatungstate (amt) as the catalyst. three consecutive reactions were considered: retro-Aldol Condensation of glucose to erythrose and glycolaldehyde (r1), retro-Aldol Condensation of erythrose to two moles of glycolaldehyde (r2), and further conversion of glycolaldehyde to side products (r3). fitting of the experimental data showed that r1 was first-order reaction while r2 and r3 were 1.7th- and 2.5th-order reaction, respectively. conversely, the reaction rate of r1 was 0.257th-order dependence on the concentration of amt catalyst. the apparent activation energies for r1, r2, and r3 were 141.3, 79.9, and 52.7 kj/mol, respectively. the high activation energy of r1 suggests that a high temperature is favorable to the formation of glycolaldehyde. the experimental c-t curves at different temperatures and initial glucose concentrations were well predicted by the kinetic model. (c) 2014 american institute of chemical engineers

  • Kinetic study of retro‐Aldol Condensation of glucose to glycolaldehyde with ammonium metatungstate as the catalyst
    AIChE Journal, 2014
    Co-Authors: Junying Zhang, Baolin Hou, Aiqin Wang, Hua Wang, Tao Zhang
    Abstract:

    The kinetics of the retro-Aldol Condensation of glucose to glycolaldehyde was studied in a batch reactor at 423-453 k using ammonium metatungstate (amt) as the catalyst. three consecutive reactions were considered: retro-Aldol Condensation of glucose to erythrose and glycolaldehyde (r1), retro-Aldol Condensation of erythrose to two moles of glycolaldehyde (r2), and further conversion of glycolaldehyde to side products (r3). fitting of the experimental data showed that r1 was first-order reaction while r2 and r3 were 1.7th- and 2.5th-order reaction, respectively. conversely, the reaction rate of r1 was 0.257th-order dependence on the concentration of amt catalyst. the apparent activation energies for r1, r2, and r3 were 141.3, 79.9, and 52.7 kj/mol, respectively. the high activation energy of r1 suggests that a high temperature is favorable to the formation of glycolaldehyde. the experimental c-t curves at different temperatures and initial glucose concentrations were well predicted by the kinetic model. (c) 2014 american institute of chemical engineers

Yi-wei Zhu – One of the best experts on this subject based on the ideXlab platform.

Walter Leitner – One of the best experts on this subject based on the ideXlab platform.

  • recycling of two molecular catalysts in the hydroformylation Aldol Condensation tandem reaction using one multiphase system
    Green Chemistry, 2020
    Co-Authors: Marc Strohmann, Walter Leitner, Jeroen T Vossen, Andreas J Vorholt
    Abstract:

    Tandem reactions are of great importance to efficiently execute multiple conversions in one synthesis step. Herein we present a multiphase system for the hydroformylation/Aldol Condensation, which is able to recycle both optimized catalysts multiple times. The system consists of an organometallic rhodium/sulfoXantphos hydroformylation catalyst and basic NaOH as Aldol Condensation initiator, which are both immobilized in a polyethylene glycol phase. Under reaction conditions, NaOH is converted to sodium formate, which is still able to catalyse the Aldol Condensation. The reaction and recycling are demonstrated by the conversion of 1-pentene to the corresponding Aldol product in a recycling experiment. During nine consecutive runs, no significant loss of activity is found with an overall TON of 8700 in regard to the rhodium catalyst and an average rhodium leaching of only of 0.07% per run is observed.

James A. Dumesic – One of the best experts on this subject based on the ideXlab platform.