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

Table 4

EDX analysis of C4 before using and at the 1st, 2nd, 3rd, and 4th cycles.

Elements		Wt.%	Atomic %
As-prepared catalyst	OK	14.73	41.58
	AgL	1.88	0.76
	CoK	0.42	0.32
	ZnK	82.96	57.31
1st cycle	OK	18.05	47.58
	AgL	1.97	0.76
	CoK	0.45	0.32
	ZnK	79.54	51.31
2nd cycle	OK	20.80	52.01
	AgL	2.08	0.77
	CoK	0.44	0.30
	ZnK	76.68	46.92
3rd cycle	OK	25.54	58.63
	AgL	2.26	0.77
	CoK	0.43	0.27
	ZnK	71.77	40.32
4th cycle	OK	31.36	65.43
	AgL	2.49	0.77
	CoK	0.36	0.20
	ZnK	65.73	33.59