Rhodium nitrate

Brown rhodium nitrate is reportedly formed from the reaction of Rhl3 with boiling nitric acid it forms a hexahydrate. 

Iodide was determined by an iodide-selective electrode (Ag2S/AgI) after other anions were separated by a rhodium nitrate element [101]. However, the electrode that was stabilised by 0.5 xm iodide responded to chloride ions in seawater, and the detection limit of iodide was 22 xg/l. 

Principal Compounds Rhodium trichloride rhodium trioxide rhodium (II) acetate rhodium nitrate rhodium potassium sulfate rhodium sulfate rhodium sulfite... 

Alternatively, Rh20s may be prepared by igniting rhodium nitrate, Rh(N03)3. 

Nitrito-pentammino-rhodium Nitrate, [Rh(NHs)5N0a](N03)2, is prepared from chloro-pentammino-rhodium chloride by dissolving it in dilute aqueous sodium hydroxide and adding pure sodium nitrite and dilute nitric acid. The substance separates as a white crystalline powder which is recrystallised from hot water. It is fairly soluble in cold water, insoluble in alcohol, and the aqueous solution, unlike that of the nitrato-nitrate, is not converted into aquo-nitrite on boiling. It is also unacted on by sodium hydroxide or ammonium sulphide. 

Aquo-pentammino-rhodium Nitrate, [Rh(NH3)5H20](N03)3, is prepared by the addition of nitric acid to a concentrated solution of aquo-pentammino-rhodium hydroxide, when the salt is precipitated in microscopic quadratic plates. It is easily soluble in water, and the dry salt loses water at 100° C., being converted into nitrato-pentammino-rhodium nitrate thus ... 

Rhodium Nitrate, Rh(N03)3.2H20, is prepared by dissolving rhodium sesquioxide in nitric acid. On concentration it separates as a deep yellow hygroscopic salt, readily soluble in water, but not -in alcohol. With nitrates of the alkali metals double salts are formed. 

The hydrogen chemisorption on two Rh/Ce02 catalysts prepared respectively from rhodium nitrate and rhodium chloride has been studied. The evolution of the ceria oxidation state with the series of treatments applied was monitored by means of a magnetic balance. Temperature Programmed Reduction and Oxidation (TPR/TPO) as well as Volumetric Adsorption techniques have also been used. 

Rhodium-Containing Cataiysts. Catalyst prepared by thermal decomposition of rhodium nitrate impregnated on activated carbon is highly active in... 

Some of the gels were used as supports to obtain dispersed metal catalysts (Rh and Pt). Thus, 2.5wt% Rh catalysts have been prepared by impregnation of the AS and AC series with aqueous solution of rhodium nitrate. A Rh/TS reference catalyst has been prepared in a similar way. Two 0.9wt% Pt catalysts were prepared by impregnation with hexachloroplatinic acid solutions of the XSIO and XCIO gels. 

The first preparation method consists in coating active phases on alumina foams. Commercial spinel powder is attrition-milled to break agglomerates. Attrition-milled MgAl204 spinel powder is dispersed in an aqueous solution of rhodium nitrates under stirring at room temperature, for 2h. The amount of Rh is calculated to produce 20wt% Rh loaded catalysts. Water is then evaporated from the slurry and residues are calcined in air (450°C, 4h). Powders obtained are used to prepare slurries which are later used to coat alumina foams. 

---