Search academic texts

Information × Registration Number 0225U000005, (0124U003968) , R & D reports Title Creation of new bifunctional zeolite catalysts for one-pot cascade processes of conversion of platform molecules from biomass into fuels and industrially valuable organic compounds popup.stage_title Розробка оловосилікатних цеолітних матеріалів для отримання алкіллактатів із цукридів Head Shcherban Nataliia D., Доктор хімічних наук Registration Date 01-01-2025 Organization L. V. Pisarzhevskii Institute Of Physical Chemistry of The National Academy of Sciences of Ukraine popup.description1 Creation of new bifunctional zeolite catalysts with specified physicochemical characteristics (nature, strength and concentration of active sites, textural properties, nature, content, size of deposited metal particles, etc.) for one-pot cascade processes of conversion of platform molecules from biomass (carbohydrates, fatty acids, furan derivatives, etc.) into fuels and industrially valuable organic compounds. popup.description2  For the synthesis of methyl lactate and lactic acid – components of biodegradable polylactates – from glucose, a set of catalysts based on tin-silicate zeolites of different structural types providing 100% conversion of glucose and the yield of methyl lactate and lactic acid up to 65 and 48%, respectively (autoclave, 160 °С, a solvent – methanol or water) was designed. It was shown that tin-silicate hierarchical zeolites prepared by a direct hydrothermal method using Gemini-type surfactants provided 100% glucose conversion, however, the maximal yield of methyl lactate or lactic acid reached 36 and 37%, respectively. Tin-silicate BEA zeolites prepared in the presence of polyvinyl alcohol as an additional porogene, provide slightly higher yields of methyl lactate or lactic acid – up to 52 and 38%, respectively. Upon conducting the reaction in water the main side products are fructose (as a product of glucose isomerization) and 2-hydroxy-methylfurfural. For a methanol medium, esters and acetals were found among other products. The application of the method of postsynthetic incorporation of tin into zeolite structure via the substitution of aluminium ions allows to significantly increase the yield of the desired reaction products, methyl lactate or lactic acid, up to 65 and 48%, respectively, probably due to the higher concentration of strong Lewis acid sites. It was shown that the presence of Brønsted acid sites, even week ones, such as defect Sn–OH groups in the catalysts, leads to a decrease in the selectivity towards the desired reaction products. Product Description popup.authors Kopa Ivan D. Kurmach Mykhailo M. Lytiuha Oleg Shvets Oleksii V. popup.nrat_date 2025-01-01 Close