| Abstract [eng] |
The high consumption of fossil fuels exacerbates such global problems as greenhouse effect, environmental pollution, as well as the rapid depletion of these fuels raises the risk of energy crisis. Therefore, efforts are being made to increase the consumption of renewable energy sources. Lignocellulosic biomass, one of renewable energy sources, can be used as a feedstock for thermochemical conversion to produce higher energy value liquid, gaseous or solid biofuels. The biomass of sunflower seed shells selected for thermochemical conversion studies is a waste that accumulates in large quantities in the food industry and can be valorized during the pyrolysis process to obtain liquid bio-oil with the potential to be used as liquid biofuels. Due to the high oxygen content of bio-oil, it is necessary to perform an upgradation step. Previous studies have shown that the upgrading of bio-oil can be carried out using catalysts such as ZSM-5, but the influence of catalyst concentration on the composition of bio-oils has been studied to a smaller extent. Therefore, this study has focused on the investigation of different weight ratios of sunflower seed shells and ZSM-5 catalyst (1:0, 1:1, 1:2, 1:5 and 1:10) influence on the composition of volatile pyrolysis compounds. The study has revealed that the proportion of catalyst in the sample has a significant impact on the composition of volatile products and by increasing ZSM-5 concentration, less oxygen-containing compounds and a higher proportion of aromatic hydrocarbons are formed during the conversion, which would increase the energy value of produced bio-oil. |
