Table 1 Performance evaluation of our catalyst in comparison to literature data.

From: Promising metal-free green heterogeneous catalyst for quinoline synthesis using Brønsted acid functionalized g-C3N4

Catalyst

Temp (°C)

Solvent

Time (h)

Yield (%)

Catalyst loading (mol%)

Rate of reaction (mol s− 1 g− 1)

References

NiO NPS

100

Solvent free

3.0

91

10

3.36 × 10− 6

56

Nafion NR50

200

Solvent free

1.0

88

20

5.48 × 10− 6

57

PMA·SiO2

78

Ethanol

1.0

88

10

1.09 × 10− 5

23

Silver Phosphotungstate

78

Ethanol

5.0

89

20

9.88 × 10− 7

58

Amberlyst 15

78

Ethanol

2.5

75

50

2.22 × 10− 7

22

Propyl sulfonic silica(PSS)

80

Solvent free

5.0

80

20

8.88 × 10− 7

59

Sulfamic acid

70

Solvent free

1.0

95

5

2.11 × 10− 5

60

 g-C3N4-(CH2)3-SO3H

100

Solvent free

4.0

97

10

2.77 × 10− 5

Present work