In this video I carry out the prep of copper chromite Cu2Cr2O5 which is used as a catalyst in organic chemistry. It can be used to catalyze the thermal decomposition of niacin into pyridine and benzoic acid into benzene.
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Prep Protocol For Copper Chromite
12.6 grams ammonium dichromate
25 grams copper(II) sulfate pentahydrate
42 mL of 10% aqueous ammonia
260 mL of 10% acetic acid.
1. In separate beakers dissolve the ammonium dichromate in 33 mL of distilled water and the copper(II) sulfate pentahydrate in 60 mL of hot water.
2. Slowly add the 10% aqueous ammonia to the beaker containing the ammonium dichromate solution with stirring in order to convert it into an ammonium chromate solution.
3. Slowly add the solution of of ammonium chromate to the copper(II) sulfate solution with rapid stirring. The brick red copper ammonium chromate will precipitate in an exothermic reaction. Allow the mixture to stir for about 5 minutes to ensure that the reaction is complete.
4. Filter out the precipitate using vacuum filtration. This filtration can be difficult and it is not necessary to filter to complete dryness.
5. Transfer the copper ammonium chromate paste to an evaporating dish and mostly dry it out over a boiling water bath.
6. Crush the mostly dry copper ammonium chromate to a fine powder. Return to the evaporating dish to complete the drying process.
7. Transfer the dry copper ammonium chromate into a crucible and heat the powder over an open flame. Heat gently for about 10 minutes thereafter increasing in intensity until the temperature is approximately 400 oC. Maintain this temperature for about 10 minutes after which the powder should have turned completely black.
8. Once the catalyst is cooled add it to a beaker containing 130 mLs of 10% acetic acid solution with stirring. Allow to stir for about 10 minutes.
9. Decant the supernatant and then wash with another 130 mLs of 10% acetic acid for about 10 minutes.
10. Allow the solid to settle for about 10 minutes.
11. Separate the copper chromite catalyst from the liquid by vacuum filtration rinsing all the solid from the beaker with distilled water.
12. Dry the powder in an evaporating dish to obtain the dry catalyst. Copper chromite is stable with regards to moisture and air.
Dougs Lab video on copper chromite prep: https://www.youtube.com/watch?v=4L5AGGfxFBc&t=33s
