Hydrogen-oxygen reactions ozone formation

In the acid-catalysed process, dominant for pH less than 2, the products isolated may be oxygen (below 0.5 Af acid), peroxomonosulphuric acid, a mixture of the two, or may contain detectable amounts of hydrogen peroxide or ozone. The formation of hydrogen peroxide (at 98 °C in 2 M HjSO ) has been examined and shown to be catalysed by a number of metal ions. Under all conditions examined the oxygen liberated arises entirely from the peroxide . Exchange between S-labelled sulphate and peroxodisulphate proceeds very slowly, if at all, in this region . Further, it appears probable that this particular decomposition path does not involve intermediates which react at appreciable rate with cerium-(III) It has been suggested that the initial, overall, reaction is... 

Trivalent phosphorus compounds are readily oxidised by oxygen, ozone, hydrogen peroxide and other oxidants to give the more stable XV derivatives (3.102) and (3.103). Such reactions are of industrial importance. In these often vigorous reactions, the formation of the stable P=0 bond is considered to be the driving force. The oxidation of PCI3 to POCI3 has been characterised as a radical-chain process with the Cl atoms as the principal chain carriers (3.104). 

The sulfur chemiluminescence detector (SCD) for GC was developed by Benner and Stedman and is based on the formation of sulfur monoxide from sulfur containing compounds by combustion in a reducing hydrogen/oxygen flame (73). The effluent from a column enters a combustion tube with a stainless steel burner maintained at 800°C. The combustion process, however, can achieve temperatures of 1800°C. The products of combustion are transferred to a reaction cell under vacuum, and ozone is added to the reaction cell, resulting in a chemiluminescence reaction. 

The products of the photochemical reaction of oxygen and hydrogen in a flow system are ozone, hydrogen peroxide, and water. Mechanisms for the formation of these products are discussed below. 

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