Abstract: Taking different types of jet fuel products in China as the research object, the life cycle assessment model of petroleum-based jet fuel (represented by straight-run kerosene hydrogenation to jet fuel), F-T synthetic oil hydroisomerization to jet fuel and fat hydrogenation to bio jet fuel (referred to as HRJ jet fuel) in typical refineries or process packaging units in China were established, and an analysis of energy consumption and carbon emission inventory was carried out to calculate the life cycle carbon intensity of typical jet fuel products in China. On this basis, the influence of the preparation process and service life on the carbon emissions during jet fuel production was studied. The results showed that the petroleum-based jet fuel had the lowest energy consumption and carbon emission intensity, while HRJ jet fuel had the highest nergy consumption and carbon emission intensity due to its unique production process and low liquid fraction yield. The preparation process and service life of catalyst were the key factors affecting the carbon emission intensity of jet fuel production. The order of carbon emission intensity in the catalyst preparation process from high to low was isomerization catalyst>supplementary hydrogenation refining catalyst>hydrogenation treatment catalyst. Based on the prediction of the longest service life of the catalyst, the carbon emission intensity caused by the catalyst was 0.06-6.29 kg/t (calculated based on the production unit mass of jet fuel products), which accounted for 0.09%-1.05% of the carbon emission intensity in the production process of different jet fuel products. Compared with catalysts with a lifespan of 3 years, the carbon emission intensity of the catalyst with a service life of 4 years was reduced by 33.3%-50.2%. The carbon emission intensity in the process of jet fuel production could be reduced by reducing the carbon emission intensity in the process of catalyst preparation and prolonging the catalyst service life.

Key words: jet fuel, hydrogenation process, catalyst, carbon emission intensity