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Synthesis of cyclic carbonates from epoxides and carbon dioxide catalyzed by talc and other phyllosilicates

Nakibuule, Fiona ; Nyanzi, Steven Allan ; Oshchapovsky, Igor ; Wendt, Ola F. LU and Tebandeke, Emmanuel LU (2020) In BMC Chemistry 14(1).
Abstract

Naturally occurring phyllosilicate minerals such as talc and vermiculite in conjunction with n-tetra butyl ammonium bromide (TBAB) co-catalyst were found to be efficient in the coupling of CO2 with epoxides to form cyclic carbonates. The reaction was carried out in a pressurized autoclave reactor at moderate pressures of 10–35 bars and temperatures of 100–150 °C. The optimized catalyst system exhibited > 90% conversion of the epoxides and > 90% selectivity for the desired cyclic carbonates, in the presence or absence of a solvent. The selectivity of the catalytic system could be improved with heat pre-treatment of the phyllosilicates albeit this resulted in slightly lower epoxide conversion. The results obtained using... (More)

Naturally occurring phyllosilicate minerals such as talc and vermiculite in conjunction with n-tetra butyl ammonium bromide (TBAB) co-catalyst were found to be efficient in the coupling of CO2 with epoxides to form cyclic carbonates. The reaction was carried out in a pressurized autoclave reactor at moderate pressures of 10–35 bars and temperatures of 100–150 °C. The optimized catalyst system exhibited > 90% conversion of the epoxides and > 90% selectivity for the desired cyclic carbonates, in the presence or absence of a solvent. The selectivity of the catalytic system could be improved with heat pre-treatment of the phyllosilicates albeit this resulted in slightly lower epoxide conversion. The results obtained using the heat treated phyllosilicates strongly support the hydrogen bond assisted mechanism for the cycloaddition of epoxides and CO2. The cycloaddition reaction could also be carried out in the absence of TBAB, although lower cyclic carbonate yields were observed. The phyllosilicate part of the catalyst system is heterogeneous, easy to separate after completion of reactions and reusable a number of runs without loss of activity.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Carbon dioxide, Cyclic carbonates, Cycloaddition, Epoxides, Phyllosilicates, Talc
in
BMC Chemistry
volume
14
issue
1
article number
61
publisher
BioMed Central (BMC)
external identifiers
  • pmid:33094290
  • scopus:85092909383
ISSN
2661-801X
DOI
10.1186/s13065-020-00713-2
language
English
LU publication?
yes
id
5df9d250-8236-4305-a0d1-faf1aad580ba
date added to LUP
2020-11-04 14:19:59
date last changed
2021-04-06 02:07:33
@article{5df9d250-8236-4305-a0d1-faf1aad580ba,
  abstract     = {<p>Naturally occurring phyllosilicate minerals such as talc and vermiculite in conjunction with n-tetra butyl ammonium bromide (TBAB) co-catalyst were found to be efficient in the coupling of CO<sub>2</sub> with epoxides to form cyclic carbonates. The reaction was carried out in a pressurized autoclave reactor at moderate pressures of 10–35 bars and temperatures of 100–150 °C. The optimized catalyst system exhibited &gt; 90% conversion of the epoxides and &gt; 90% selectivity for the desired cyclic carbonates, in the presence or absence of a solvent. The selectivity of the catalytic system could be improved with heat pre-treatment of the phyllosilicates albeit this resulted in slightly lower epoxide conversion. The results obtained using the heat treated phyllosilicates strongly support the hydrogen bond assisted mechanism for the cycloaddition of epoxides and CO<sub>2</sub>. The cycloaddition reaction could also be carried out in the absence of TBAB, although lower cyclic carbonate yields were observed. The phyllosilicate part of the catalyst system is heterogeneous, easy to separate after completion of reactions and reusable a number of runs without loss of activity.</p>},
  author       = {Nakibuule, Fiona and Nyanzi, Steven Allan and Oshchapovsky, Igor and Wendt, Ola F. and Tebandeke, Emmanuel},
  issn         = {2661-801X},
  language     = {eng},
  number       = {1},
  publisher    = {BioMed Central (BMC)},
  series       = {BMC Chemistry},
  title        = {Synthesis of cyclic carbonates from epoxides and carbon dioxide catalyzed by talc and other phyllosilicates},
  url          = {http://dx.doi.org/10.1186/s13065-020-00713-2},
  doi          = {10.1186/s13065-020-00713-2},
  volume       = {14},
  year         = {2020},
}