Mesoporous Silica Supported Au Nanoparticles with Controlled Size as Efficient Heterogeneous Catalyst for Aerobic Oxidation of Alcohols

Table 2

Catalytic activities of various Au/OMS samples for aerobic oxidations of 1-phenylethanol and its paraderivates.

Substrate	Products	Catalysts	Conversion efficiency (%)	TOF (h^−1)	Selectivity (%)
		Au-1	>99.5	342	>99.5
		Au-1	>99.5	342	>99.5
		Au-1	97.8	334	>99.5
		Au-2	88.0	241	>99.5
		Au-3	80.5	151	>99.5
		Au-4	32.1	29	>99.5
		Au-1	95.0	325	>99.5
		Au-2	83.0	227	>99.5
		Au-3	73.0	199	>99.5
		Au-4	61.5	56	>99.5
		Au-1	96.7	331	>99.5
		Au-2	88.9	243	>99.5
		Au-3	79.0	147	>99.5
		Au-4	46.4	42	>99.5
		Au-1	89.3	305	>99.5
		Au-2	81.7	224	>99.5
		Au-3	70.0	56	>99.5
		Au-4	54.2	49	>99.5

Reactions conditions: 60 mg of catalyst, 0.6 mmol of substrates, 0.3 mmol of Na₂CO₃, 100°C, 24 h, and 6 mL of toluene as solvent.
Recycled results.
Recycled for 5 times. The sample was dried at 140°C before the 5th recycle.