Search academic texts

Information × Registration Number 0220U101818, 0119U002378 , R & D reports Title Modified by acids and 3d metals bentonites and clinoptilolite from deposits of Ukraine as catalysts for the transformation of glycerol and its derivatives. popup.stage_title Head Yavolovskyi Arkadii О., Доктор хімічних наук Registration Date 26-02-2020 Organization Physico-Chemical Institute O. Bogatsky National Academy of Sciences of Ukraine popup.description2  Objects of study – natural aluminosilicates (bentonite, clinoptilolite), glycerol. Aim of study – develop the scientific basis complex of catalytic methods for glycerol utilization into "small-tonnage products", which are promising as additives for motor fuels, pharmaceuticals, cosmetics, food industry, and also for combinatorial chemistry as intermediates, synthons, etc. промышленности, а также для комбинаторной химии в качестве полупродуктов, синтонов и др. Research methods – spectrophotometry, kinetics, potentiometry, gas-liquid chromatography. Was investigated samples of natural KP [(geylandit), Sokirnitskiy deposit, Transcarpathian region, chemical composition: SiO2 - 71.5%; Al2O3 - 13.1%; Fe2O3 - 0.9%; main phases: clinoptilolite, mordenite, α-Fe2O3, α-quartz] and BT [(montmorillonite)], Dashukovskiy deposit, Cherkasy region, chemical composition: SiO2 - 49.6%; Al2O3 - 13.5%; Fe2O3 - 7.2%; phase composition: montmorillonite, α-quartz]. Modification of initial samples, with an average particle diameter 1.5 mm, was carried out with nitric acid (NA) (С=1÷3 mol/l, 100°С, =1÷3 h). Samples of obtained catalysts are designated as H-BT-τ_C and H-KP-τ_C. Obtained catalyst samples have an inhomogeneous porous structure with presence of micro- and mesopores. The surface acidity of catalysts was evaluated by pH of samples aqueous suspension. For H-KP samples: 1_3 pH = 2,7; 1_1 pH = 3,2; 3_3 pH = 3,2. For H-BT samples: 3_1 pH = 4,0; 1_1 pH = 4,0; 3_3 pH = 3,7. They contain acidic centers both Lewis (LAC) and Brenstend (BAC). In the case of H-BT-3-3, LAC dominate, and H-KP-3-3 - BAC. The catalytic properties of H-BT and H-KP samples are compared in glycerol (GL) reactions with acetone (Ac) and benzaldehyde (BA). It was found that NA concentration in greater extent than time of natural aluminosilicates treatments with acid affects on activity of corresponding samples. It was found that Н-BТ-1_3 and Н-BТ-3_3 exhibit great catalytic activity than Н-BТ-1_1, Н-BТ-3_1 and КU Product Description popup.authors Davtian Araksia S. Kamalov Gerbert L. Levchenko Olha О. Chihichin Dmitro G. Yavolovskyi Arkadii О. popup.nrat_date 2020-04-02 Close