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Abstract
The reactions of ozone with 2,3-Dimethyl-2-Butene (CH3)2C=C(CH3)2 and 1,3-Butadiene CH2=CHCH=CH2 have been investigated under atmospheric conditions at 298±3K in air using both relative and absolute rate techniques, and the measured rate coefficients are found to be in good agreement in both techniques used. The obtained results show the addition of ozone to the double bond in these compounds and how it acts as function of the methyl group substituent situated on the double bond. The yields of all the main products have been determined using FTIR and GC-FID and the product studies of these reactions establish a very good idea for the decomposition pathways for the primary formed compounds (ozonides) and give a good information for the effect of the methyl group on the degradation pathways. The results have been discussed from the view point of their importance in the atmospheric oxidation of these pollutants.
Highlights
In most of the countries, air pollution is considered as a major problem, high levels of smoke and sulfur dioxide arising from the combustion of fossil fuels that contain sulfur
Photochemical reactions that come as a result from the action of sunlight on nitrogen dioxide NO2 and volatile organic compounds (VOCs) emits from vehicles, can definitely lead to the formation of ozone, which is considered as a secondary long-range pollutant, that impacts in rural areas that far from the original place of emission [1]
The relative rate technique is well known as a reliable technique that has been used to study the gas-phase reactions of VOCs with O3 and NO3 [14, 15]
Summary
In most of the countries, air pollution is considered as a major problem, high levels of smoke and sulfur dioxide arising from the combustion of fossil fuels that contain sulfur. Pollution is the real threat to the air which caused by dangerous emissions of poisons and particles This major problem comes from a fact that is petrol and diesel engine motor vehicles emit a wide variety of pollutants, principally carbon monoxide CO, oxides of nitrogen NOx, volatile organic compounds (VOCs) and particulates (PM10) those completely have increased the impact on urban air quality. Many complicated chemical processes occurring in the atmosphere lead to the formation of ozone and some other photochemical pollutants [4] All these processes participating in a very high percentage in formation of ozone, and many other chemical compounds like peroxyacetyl nitrate PAN nitric acid HNO3, sulfuric acid H2SO4 particulate matter, formaldehyde (HCHO), and carbonyl compounds [5,6,7]. There were some studies suggested that a possible reaction of 2,3-dimethyl 2butene with bromine may be participated in elimination of this compound from the atmosphere [13]
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