Тип публикации: статья из журнала
Год издания: 2022
Идентификатор DOI: 10.17516/1998-2836-0279
Ключевые слова: heterogeneous catalysis, gamma-valerolactone, levulinic acid, zro2, sba-15, catalytic transfer hydrogenation, hydrogen donor, isopropanol
Аннотация: Two series of ZrO2-containing catalyst varied in textural and acidic properties were synthesized: 1) mesoporous composites on SBA-15 (fabricated by co-precipitation and layer-by-layer deposition of Zr); 2) bulk ZrO2 (prepared by precipitation (monoclinic) and template method (inverse opals)). The catalysts were characterized by (TEПоказать полностьюM, SEM, UV and IR spectroscopy, XRF, N-2 adsorption, pH(pzc)) and tested in levulinic acid to gamma-valerolactone conversion in a hydrogen-donor solvent - isopropanol, via hydrogen transfer by the Meerwein-Ponndorff-Werley mechanism. For ZrO2-containing catalysts based on SBA-15, zirconium content and catalyst acidity turned out to be activity-determining properties. An increase in the catalyst acidity with a zirconium content reduction leads to a rise in the substrate conversion rate and a decrease in the GVL selectivity. The maximum GVL yield was 94 mol.% (190 degrees C, 120 min.) on the Zr/SBA-15(2) catalyst fabricated by double layering of zirconia onto a mesoporous silica matrix. The activity of bulk ZrO2 turned out to be significantly lower, providing the maximum GVL yield 50 mol.% (190 degrees C, 195 min.) in the presence of monoclinic ZrO2.
Журнал: JOURNAL OF SIBERIAN FEDERAL UNIVERSITY-CHEMISTRY
Выпуск журнала: Vol. 15, Is. 1
Номера страниц: 137-155
ISSN журнала: 19982836
Место издания: KRASNOYARSK
Издатель: SIBERIAN FEDERAL UNIV