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Preparation of Copper Chromite


Preparation of high-active copper chromite dehydrogenation catalyst

A solution of 260 g of Copper(II)nitrate trihydrate in 900 ccm of tap water at 80C was added while stirring to a soln 178 g of sodium dichromate dihydrate and 225 ml of 28% NH4OH made up to 900 ml at 25C. The precipitate was collected by suction filtration and slurried in water three times. The copper ammonium chromate was dried at 75-80C overnight. This was powdered and added in small portions to a one liter 3-neck flask equipped with a stainless steel stirrer Hershberg type which scrapped close to the bottom of the flask. The flask was partially immersed in a Woods-alloy metal bath at 350C (with 300-320C, one can obtain good results). The time of addition was 15 min (a lot of fumes evolved) and the mixture was stirred at 350C for another 15 min after all was complete. The cooled and black dusty powder used as is for the dehydrogenation.

Reference: JACS 71, 1130 (1949)

Copper Chromite Catalyst Preparation (Organic Syntheses)