Search academic texts

Information × Registration Number 0214U000253, 0111U007235 , R & D reports Title Nanocomposite porous materials on the basis of titanium dioxide and carbon for technologies of using and accumulation of hydrogen. popup.stage_title Head Manorik Petro Andrievich; Ilyin Volodimir Georgievich, Registration Date 04-02-2014 Organization L.V.Pysarzhevsky Institute of Physical Chemistry of National Academy of Science of Ukraine popup.description2 Synthesized and characterized by XRD, SEM, TPD MS, UV and IR spectroscopy of titania spheres of different morphology and composition. The resulting materials had a diameter of 100-900 nm and the anatase structure. Established that sulfate ions of the modified TiO2-spheres characterized by a strong hydrogen bonding of water molecules with the acid groups of the surface that provides the water stability of the domains in the range 25-300 °C. Proton conductivity of spheres (10-7-10-8 cm) maintained in the range of 25-250 °C. The techniques of the heterophase doping membrane Nafion, composite membranes characterized by IR spectroscopy, SEM, EDS, showing mesoscopic ordering and self-organization in the areas of polymer structure. Evaluated the proton conductivity of composite membranes. Preliminary results indicate an increase in the conduction interval of composite membranes (up to 240 °C) at the level of (10-3-10-5 cm). It found that the conductivity of the obtained composite may indicate safety percolation of the cluster structure in the investigated temperature range due to the polarization of water molecules on the surface acidic groups. A comparative study of the conditions and the products of matrix (in the pores BEA, NaY and MMC type SBA-15, KIT-6 etc.) carbonization of nitrogenous (sucrose+melamine or urea, acetonitrile) and polyaromatic (2,3-dihydroxynaphthalene) compounds. Study their sorbtion properties (adsorption of H2 and N2). A substantial influence of the synthesis conditions of nitrogen-containing carbon materials (NCM) and carbon-siliceous materials (CSM) on the parameters of the porous structure was found: NCM characterized by micro- (Vmi - to 0.40 cm3/g, SBET - up to 1000 m2/g) and mesoporous (Vme - up to 2.0 cm3/g, Dme = 5.8 - 6.0 nm, SBET - up to 1200 m2/g) structure; CSM - mesoporous (Vme - to 0.60 cm3/g, Sme - up to 300 m2/g, the Dme = 3,5 - 5,5 nm). Found that increase in hydrogen adsorption capacity (energy |?mo| of specific adsorption in volume (rv) and on the surface (rs)) received NCM and CSM, rising |?mo| and r at the formation of nitrogen-containing hydrogen adsorption sites for microporous AVM. In particular, based on the volume of product carbonization of sucrose: |mo| - 5.0 to 5.6 kJ/mol, rv - from 53 to 69 mg/cm3) and thin carbon coating in mesopores MMC (for CSM -based SBA-15: |?mo| - from 2.8 to 5.1 kJ/mol, rs - from 6.0 to 10.4 mkg/m2). Specific hydrogen capacity investigated nitrogenous CM - up to 1.8 % by weight (at 77 K and 760 Torr). Product Description popup.authors Леоненко Євген Володимирович Тельбіз Герман Михайлович Філоненко С.М. Щербань Наталія Дмитрівна Яремов Павло Степанович popup.nrat_date 2020-04-02 Close