Zeolite Encapsulated Nanocrystalline CuO: A Redox Catalyst for the Oxidation of Secondary Alcohols

Table 1

Zeolite encapsulated nanocrystalline CuO catalyzed oxidation of alcohols^(a).

S. No	Substrate	Catalyst	% Conversion^(b)	% of products
				2	3	4	5	X^(c)
(1)	Benzoin	CuOY	100	92.2	—	—	—	7.8
(2)	Benzhydrol	CuOY	100	29.1	70.9	—	—	—
(3)		CuOY^(d)	nil	—	—	—	—	—
(4)		Cu^2+Y	21.0	28.7	71.3	—	—	—
(5)		NaY	11.2	—	100	—	—	—
(6)		CuO	100	100	—	—	—	—
(7)		Y-zeolite-CuO^(e)	100	90.0	8.4	—	—	1.6
(8)	1-Phenylethanol	CuOY	100	—	—	84.9	—	15.1
(9)		CuO	78.0	100	—	—	—	—
(10)	Hydrobenzoin	CuOY	100	—	—	—	100	—
(11)	Benzyl alcohol	CuOY	13.7	100	—	—	—	—

^(a)Substrate loaded zeolite heated in solid phase reactor at 200^°C for 1 hour under oxygen atmosphere.
^(b)Analyzed in GC, error limit ±3%.
^(c)Unidentified products.
^(d)Reaction carried out at 100^°C.
^(e)Physical mixture of Y-zeolite and CuO.