PROCESS OF PREPARING RHODIUM NITRATE SOLUTION

摘要

Disclosed herein is a process of preparing a rhodium nitrate solution which comprises reacting rhodium hydroxide with nitric acid characterized in that the mixed solution of the rhodium hydroxide and the nitric acid is concentrated under heating. Rhodium nitrate prepared by a conventional method which comprises dissolving the precipitate of rhodium hydroxide which has been prepared by dissolving rhodium black in concentrated sulfuric acid under heating and controlling pH possesses low supporting efficiency on a support for preparing a catalyst. When the mixture of the rhodium hydroxide and the nitric acid is concentrated under heating according to the present invention, the conversion of the compounds conjecturally formed at an initial stage of the reaction into the desired rhodium nitrate is considered to be accelerated to prepare the rhodium nitrate solution with high purity by the above concentration under heating of the mixture of the rhodium hydroxide and the nitric acid, and the supporting efficiency of the rhodium nitrate to the inorganic support can be improved to about 99%.