Heterogeneous Metal Catalysts for Oxidation Reactions

Table 10

Oxidation of ethylbenzene by three different types of Au/SBA-15 catalysts [40].

Entry	Catalysts/sample; (Au average size)	Wt.% (mmol Au/g)	Conversion (%)	Selectivity (%)		TON	TOF (h^−1)
				Ketone	Alcohol
1	SBA-15	—	~0	~0	~0	~0	~0
2	Au/SBA-15 catalyst; (5.4 ± 1.2 nm)	1.08%; (54.8 μmol/g)	68	94	6	764	23
3	Au/SBA-15 catalyst; (6.9 ± 1.7 nm)	3.86%; (196.0 μmol/g)	79	93	7	274	8
4	Au/SBA-15 catalyst; (8.4 ± 2.3 nm)	4.56%; (231.5 μmol/g)	89	94	6	256	7

Reaction condition: substrate, ethylbenzene, 1 mmol; oxidant: 80% TBHP (aq.), 2 mmol; solvent: acetonitrile, 10 mL; catalyst: Au/SBA-15 sample with 15 mg overall mass; reaction temperature: 70°C; internal standard: chlorobenzene (0.5 mL); reaction time: 36 h; and reaction atmosphere: air [40].