Oxidation reaction catalyst and process for producing a compound using the same
It is a problem to be solved by the present invention to provide an oxidation catalyst which, in oxidation of a compound, can efficiently effect oxidation using oxygen in the air as an oxygen source and can be used repeatedly. The above-mentioned problem was solved by an activated carbon in which the BET specific surface area S determined by a nitrogen adsorption method and the amount of surface oxygen which will leave in the form of carbon monoxide O CO (% by weight) satisfy formula (I) 4000<S×O CO . By using this oxidation catalyst, it is possible to oxidize a compound having an oxidizable carbon atom linked directly to an aromatic ring, including a heterocyclic ring, to a corresponding aldehyde or keto compound, or to oxidatively dehydrogenate a hydrogen-containing compound to form an unsaturated bond or a cyclic compound, or to oxidatively and dehydrogenatively form a nitrogen-containing heterocyclic ring from an aryl aldehyde and a compound having a pair of adjacent carbon atoms, one of the carbon atoms having an amino group and the other having an amino, hydroxyl or mercapto group.
1. An oxidation catalyst comprising an activated carbon which satisfies formula (I):
4000<S×(O co ) (I)
wherein S represents a BET specific surface area (m 2 /g) and Oco represents a percent by weight of the amount of surface oxygen which will leave in the form of carbon monoxide to the activated carbon determined by the following method:
the method for determining Oco:
about 3 g of activated carbon is weighed out and is placed in a quartz tube with an inner diameter of about 25 mm and a length of about 100 cm; the quartz tube is inserted into a temperature-controllable tube furnace, which is then heated from room temperature to 900° C. over 30 minutes and is held at that temperature for 30 minutes while nitrogen gas is caused to flow at a rate of 0.1 L/min; the whole portion of the gas exhausted during this process is collected and the quantity of carbon monoxide is determined with a gas chromatography equipped with a methane converter; then, the percent by weight of the quantity of the oxygen contained in the carbon monoxide to the quantity of the activated carbon is calculated.
2. The oxidation catalyst according to claim 1 , wherein the activated carbon is an activated carbon chemically activated at 300-700° C.
3. A method for producing an oxidation reaction product comprising bringing an oxidizable organic compound into contact with oxygen in the presence of the oxidation catalyst recited in claim 1 .