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A kinetic study of Zn halide/TBAB-catalysed fixation of CO2 with styrene oxide in propylene carbonate

Lookup NU author(s): Abdul Rehman, Mohamad Gunam Resul, Dr Valentine Eze, Professor Adam Harvey

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


Abstract

© 2019 Rehman et al.Synthesis of styrene carbonate (SC) via the fixation of CO2 with styrene oxide (SO) has been investigated using a combination of zinc bromide (ZnBr2) and tetrabutylammonium halides (TBAX) as acid-base binary homogeneous catalysts. The combination of ZnBr2 and TBAB had a synergistic effect, which led to about 6-fold enhancement in the rate of SC formation as compared to using TBAB alone as a catalyst. Propylene carbonate (PC) was chosen as a green solvent for a comprehensive study of reaction kinetics. The reaction followed a first-order kinetics with respect to SO, CO2, and TBAB, whereas a fractional order was observed for the ZnBr2 when used in combination with the TBAB. Arrhenius and Eyring's expressions were applied to determine the kinetic and thermodynamic activation parameters, where activation energy (Ea) of 23.3 kJ mol-1 was obtained for the SC formation over the temperature range of 90-120°C. The thermodynamic analysis showed that positive values for enthalpy (ΔH‡ = 18.53 kJ mol-1), Gibbs free energy (ΔG‡ = 79.74 kJ mol-1), whereas a negative entropy (ΔS‡ =-162.88 J mol-1 K-1) was obtained. These thermodynamic parameters suggest that endergonic and kinetically controlled reactions were involved in the formation of SC from SO and CO2


Publication metadata

Author(s): Rehman A, Gunam Resul MFM, Eze VC, Harvey A

Publication type: Article

Publication status: Published

Journal: Green Processing and Synthesis

Year: 2019

Volume: 8

Issue: 1

Pages: 719-729

Online publication date: 06/08/2019

Acceptance date: 19/05/2019

Date deposited: 28/08/2019

ISSN (print): 2191-9542

ISSN (electronic): 2191-9550

Publisher: Walter de Gruyter GmbH

URL: https://doi.org/10.1515/gps-2019-0042

DOI: 10.1515/gps-2019-0042


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