Aqueous borohydride solutions catalyst preparation

In principle, the same methods used for the preparation of platinum catalysts may be applied for palladium catalysts. When palladium chloride is used as a starting material, it is usually dissolved into an aqueous solution as chloropalladic acid by adding hydrochloric acid prior to reduction or formation of precipitates. Unsupported and supported palladium catalysts have been prepared by reduction of palladium salts with alkaline formaldehyde,139 168 sodium formate,169 hydrazine,150 hydrogen,170,171 sodium borohydride,146,172 or sodium hydride-t-AmOH,173 or by reduction of palladium hydroxide174,175 or palladium oxide176 with hydrogen. 

FIGURE 7.2 (a) TEM image of acetate stabilized ruthenitim(0) nanoparticles prepared from the reduction of 1.33mM ruthenium(III) chloride trihydrate by 9.3 mM sodium borohydride in the presence of l.OM acetate ion in aqueous solution, (b) plot of the volume of hydrogen (mL) versus time (s) for the hydrolysis of sodium borohydride catalyzed by ruthenium(O) nanoparticles with different catalyst concentrations at 25.0 0.1 °C. [NaBH4lo=150mM. 

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