INVESTIGATION OF THE DEPENDENCE OF SPECIFIC CARBON DIOXIDE EMISSIONS ON THE CHEMICAL COMPOSITION OF HIGH-OCTANE COMPONENTS OF MOTOR GASOLINES

The anthropogenic emission of greenhouse gases, mainly carbon dioxide (CO2), is considered as one of the main causes of global climate change. The transport sector is one of the largest emitters of carbon dioxide (accounting for more than 20 % of all CO2 emissions), therefore, reducing the carbon footprint of vehicles should be considered one of the main directions of technological decarbonisation. It is shown in the article that the CO2 emissions of motor gasoline significantly depend on the component composition of commercial gasoline. Calculations of specific CO2 emission from the combustion of high-octane components of motor gasoline, namely reformate and isomerisate, were carried out. It is shown that for reformate, the specific emission of CO2 per 1 t of reformate and per unit energy released is higher by 6.0 and 13.4 %, respectively, than the values for isomerisate. It is shown that the main reason for large specific CO2 emissions for reformate is the high content of aromatic hydrocarbons in it. Moreover, unlike for paraffinic hydrocarbons, the lower is the molecular weight of aromatic compounds, the higher are specific CO2 emissions. The presented results can be used to implement the transition to the low-carbon model for the development of the transport sector by utilising more environmental-friendly kinds of fuel through modifying its composition. These approaches do not require changing the design of internal combustion engines or introducing new infrastructure, as in the case, for example, of using engines powered by pure hydrogen.