An efficient atom-economical chemoselective CO2 cycloaddition using lanthanum oxide/tetrabutyl ammonium bromide

The cycloaddition reaction between carbon dioxide (CO2) and epoxides is an attractive example for the synthesis of value-added chemicals exploiting CO2 greenhouse emissions gas. In this study, we reported on propylene carbonate (PC) production mediated by a lanthanum oxide (La–O)/tetrabutyl ammonium...

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Bibliographic Details
Published in:Sustainable energy & fuels 2018-06, Vol.2 (6), p.1342-1349
Main Authors: Qaroush, Abdussalam K, Alsoubani, Fatima A, Al-Khateeb, Ala'a M, Nabih, Enas, Al-Ramahi, Esraa, Khanfar, Mohammad F, Assaf, Khaleel I, Eftaiha, Ala'a F
Format: Article
Language:English
Subjects:
Ammonium
Ammonium bromides
Carbon cycle
Carbon dioxide
Carbon monoxide
Catalysts
Catalytic converters
Cycloaddition
Density functional theory
Epoxides
Greenhouse gases
Lanthanum
Lanthanum oxides
Propylene
Reaction mechanisms
Reaction time
Selectivity
Substrates
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Summary:The cycloaddition reaction between carbon dioxide (CO2) and epoxides is an attractive example for the synthesis of value-added chemicals exploiting CO2 greenhouse emissions gas. In this study, we reported on propylene carbonate (PC) production mediated by a lanthanum oxide (La–O)/tetrabutyl ammonium bromide (TBAB) binary mixture. The effect of different reaction parameters including catalyst/co-catalyst loading, the amount of substrate, CO2 pressure, temperature, and reaction time was investigated. The binary catalytic system showed high catalytic conversion and selectivity. Catalyst reusability experiments indicated that the binary system was recyclable over five times without losing its activity/selectivity. In addition, a plausible reaction mechanism based on spectroscopic and kinetic measurements was presented, which was supported by density functional theory (DFT) calculations.
ISSN:2398-4902
DOI:10.1039/c8se00092a