Selective Oxidation of Styrene to Benzaldehyde by Co-Ag Codoped ZnO Catalyst and H₂O₂ as Oxidant

Table 3

Effect of styrene, H₂O₂ molar ratio, temperature, and solvent.

Entry	H2O2/Styrene	Solvant	Temperature (°C)	Styrene conversion	Yield^a (% mol)
					Benzaldehyde	Acetophenone
1	1.1	Acetonitrile	80	61	57	3
2	1.5	Acetonitrile	80	66	62	3
3	2	Acetonitrile	80	70	67	3
4	2.5	Acetonitrile	80	81	72	3.5
5	3	Acetonitrile	80	95	73	5
6	2.5	Acetonitrile	40	10	10	0
7	2.5	Acetonitrile	70	50	50	0
8	2.5	Acetonitrile	100	94	60	4
9	2.5	Acetonitrile	120	98	50	9
10	2.5	Acetone	80	90	77	12
11	2.5	Water	80	12	12	0
12	2.5	Methanol	80	75	59	6
13	2.5	Ethanol	80	50	31	7

Reaction conditions: C4 catalyst (0.02 g); reaction time, 24 h; ^ayields determined by GC using dodecane as an internal standard.