Evaluation of Structural Properties and Catalytic Activities in Knoevenagel Condensation Reaction of Zeolitic Imidazolate Framework-8 Synthesized under Different Conditions

Table 3

Effect of the different catalysts on Knoevenagel condensation.

Catalyst	Precursors	Reaction condition	Benzaldehyde conversion (%)	References
ZIF-8	Benzaldehyde (10 mmol) and ethyl cyanoacetate (10 mmol)	30°C, 6 h, 0.1 g of the catalyst	76.5	The present work
ZIF-8	Benzaldehyde (1.9 mmol) and malononitrile (1.9 mmol)	Room temperature, 6 h, 0.02 g of the catalyst	51	[19]
MCM-41	Benzaldehyde (10 mmol) and diethyl malonate (10 mmol)	Room temperature, 24 h, 0.025 g of the catalyst	56–70	[16]
Amine-MCM-41	Benzaldehyde (10 mmol) and diethyl malonate (10 mmol)	Room temperature, 24 h, 0.025 g of the catalyst	78–92	[16]
[CTA^+]-Si-MCM-41	Benzaldehyde (4.8 mmol) and ethyl cyanoacetate (4.8 mmol)	30°C, 3 h, 20 mg of the catalyst	57.2	[17]

ZIF-8 sample synthesized with process B at 200°C.