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Table 2 Conversion and selectivity in the coupling of propylene oxide (PO) and CO2 to produce propylene carbonate (PC) catalysed by various phyllosilicates at 120 °C

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

Entry

Catalyst

Co-catalyst

PO Conversion [%]

PC Selectivity [%]

1a

Biotite

–

Trace

–

2a

Chlorite

–

4.3

–

3a

Phlogopite

–

3.7

–

4a

Talc

–

10.2

27.5

5a

Vermiculite

–

8.6

30.1

6

Biotite

TBAB

44.5

68.3

7

Chlorite

TBAB

55.0

70.4

8

Phlogopite

TBAB

48.6

72.0

9

Talc

TBAB

68.7

94.2

10

Vermiculite

TBAB

60.3

96.1

11

Talc

TBAI

65.4

93.6

12

Talc

DMAP

36.9

84.7

13b

–

TBAB

42.0

96.8

  1. Reaction conditions: propylene oxide (10 mmol), catalyst (100 mg), co-catalyst (2.5 mol % of epoxide), CO2 (20 bars), CH3CN (5 ml), Time (20 h)
  2. aNo co-catalyst
  3. bNo phyllosilicate