Catalytic peroxide, nitric acid

Our approach utilized the metals gold, platinum, then later gold, platinum, and nickel electroplated in succession because the catalytic decomposition of hydrogen peroxide reaction we tested was most efficiently catalyzed with platinum.After fabrication of the nanowires they were freed by removing the conductive silver backing with nitric acid and the sacrificial template with a strong base, sodium hydroxide. Then nanorods were washed with deionized water and ultracentrifuged to achieve a neutral pH. 

Initial halogenation of the oxime can use chlorine, hypobromite, bromine, or A-bromoacetamide. " Oxidation of the a-halonitrosoalkane can be achieved with nitric acid, nitric acid-hydrogen peroxide, " atmospheric oxygen, ozone, or a peroxyacid. Reduction of thea-halonitroalkaneis achieved with sodium borohydride or by catalytic hydrogenation, although potassium hydroxide in ethanol has been used for the conversion. 

In neutral solution hydrogen peroxide is decomposed catalytically by lead elioxielc, but in aciel solution the action is different and quantitative-.5 Thus, in the presence of nitric acid,... 

A peroxide, probably Ag203, is stated to be produced by anodic oxidation of silver in acid solution.4 When solutions of sodium or potassium persulphate react with silver or silver nitrate, a peroxide with a higher percentage of oxygen than Ag2Oa is produced, the process being attended by catalytic decomposition of the persulphate with formation of the acid sulphate. Ammonium persulphate does not yield a peroxide, but the ammonium radical becomes oxidized to nitric acid.6... 

The catalytic effect of the nitric acid gas has been attributed to (a) increase in the concentration of active oxygen and (b) greater oxidizing power of nitrogen peroxide.27 The formation of phenol from benzene by electrochemical oxidation has been explained on the basis of atomic oxygen,18 a hypothesis that may hold in this case. A mechanism for the catalytic effect of nitrogen peroxide based on the conclusion that it is readily activated by the absorption of radiation over a relatively wide range of frequencies is as follows ... 

Several kinetic spectrophotometric methods have been developed for selenium determination. The catalytic effect of Se(IV) on the reduction of thionine by sulfide ions has been explored. The reaction is monitored spectrophotometrically by following the decrease in absorbance at 598 nm, and the method has an LOD of 5ngml . Another method is based on the catalytic effect of selenium on the oxidation of methyl yellow by hydrogen peroxide in a nitric acid medium. It is monitored by the loss of the red color of methyl yellow. The method is extremely sensitive, with the possibility of measuring concentrations of 0.2ngml . Selenium can be also determined based on its effect on the oxidation reaction of methyl orange with bromate in acidic media. 

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