Pyrrolidone Modifying Gold Nanocatalysts for Enhanced Catalytic Activities in Aerobic Oxidation of Alcohols and Carbon Monoxide

Table 1

Catalytic oxidation of benzyl alcohol, phenylethyl alcohol, cyclohexanol, and 1-hexanol over various catalysts. The substrate conversions and selectivities to the aldehyde/ketone products are presented.

Entry	Benzyl		Phenylethyl				1-
	Conv.	Sel.	Conv.	Sel.	Conv.	Sel.	Conv.	Sel.
	(%)	(%)	(%)	(%)	(%)	(%)	(%)	(%)
Au/C	16.2	98.8	43.3	>99.5	6.3	>99.5	4.4	97.9
Au/C +	35.5	98.0	66.9	>99.5	15.1	>99.5	14.1	99.1
Au/BN	10.0	99.0	21.2	>99.5	4.2	>99.5	4.9	99.0
Au/BN +	21.9	99.5	29.0	>99.5	10.0	>99.5	17.1	98.4
Au/TiO2	29.1	97.9	66.6	>99.5	16.1	>99.5	9.9	98.9
Au/TiO2 +	55.0	96.5	75.6	>99.5	31.9	>99.5	21.2	98.3
Au/SBA-15	32.1	99.0	70.0	>99.5	11.0	>99.5	11.0	98.9
Au/SBA-	58.1	99.0	84.2	>99.5
Au/SBA-	66.0	99.4	87.3	>99.5
Au/SBA-15 +	59.0	99.0	91.3	>99.5	22.4	>99.5	25.0	99.2
Au/SBA-15 +	79.6	99.1	97.5	>99.5
Au/SBA-15 +	93.2	98.0	99.0	>99.5

conditions: 1 mmol of alcohol, 3 mL of toluene solvent, 5 bar of oxygen, 30 mg of catalyst, 100°C, 3 h; conditions: 1 mmol of alcohol, 3 mL of toluene solvent, 30 mg of catalyst, 80°C, 3 h; conditions: 1 mmol of alcohol, 3 mL of toluene solvent, 30 mg of catalyst, 100°C, 5 h; conditions: 1 mmol of alcohol, 3 mL of p-xylene solvent, 30 mg of catalyst, 120°C, 5 h;  mg of PVP was physically mixed with the catalysts;  mg of catalyst was used. The molar ratio of S/C (substrate/catalyst) is about 192;  mg of catalyst was used. The molar ratio of S/C (substrate/catalyst) is about 96;  mg of PVP was added;  mg of PVP was added.