Svitlana M. Filonenko

Structure and Porosity of Silicon Carbide Produced by Matrix Method

Silicon carbide in the β

Porosity Enhancement of Silicon Carbide by Preparation in Micro-Mesoporous Zeolite-Like Matrices

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Simple method for preparing of sulfur–doped graphitic carbon nitride with superior activity in CO2 photoreduction

modification with a developed surface and a large pore size was obtained by carbothermal reduction using mesoporous siliceous molecular sieves (SBA-15, KIT-6, MCF, SBA-3). The formation of silicon carbide with high porosity parameters is favored by the use of the KIT-6 mesoporous molecular sieve (MMS) with a three-dimensional structure and a mutually intersecting system of mesopores as matrix, by the close to the stoichiometric C/SiO2 ratio, and also by the higher level of filling with carbon in the pores of the siliceous MMS.

Boron-doped nanoporous carbons as promising materials for supercapacitors and hydrogen storage

Partly zeolitized micro-mesoporous aluminosilicates SBA-15/ZSM-5 were synthesized by conversion of dry gel of template-containing SBA-15 in the presence of tetrapropylammonium hydroxide. They have a hexagonally ordered mesostructure and developed surface and mesoporosity for which the concentration and strength of the Brønsted and Lewis acid sites are higher than in AlSi-SBA-15. The formation of Brønsted acid sites of moderate strength in the samples with a low degree of zeolitization is due to the presence of ZSM-5 precursors as well as crystallites in the obtained aluminosilicates.

Synthesis and physical–chemical properties of N-containing nanoporous carbons

Heat treatment of carbon–silica composites derived from micro-mesoporous zeolite-like materials yields the β-modification of silicon carbide with adsorption characteristics much superior to those of analogs obtained using large-porous silica exotemplates (meso-cellular foams). The presence of a large volume of relatively homogeneous mesopores, which permits us to achieve a close-to-stoichiometric C/SiO2 ratio, accounts for the formation of silica carbide with well-developed porosity.

Morphological features of porous silicon carbide obtained via a carbothermal method

The strength of the acid sites in isostructural hierarchical porous zeolites increases in the order BSiO < GaSiO < AlSiO, and the concentration in the structural types increases in the order MTW < BEA < MOR. Zeolite materials with BEA and MOR topology, which consist of nanocrystals with ultrathin-layer morphology, are characterized by a marked decrease of the adsorption potential compared with isostructural materials with nanorods or nanosphere morphology due to a 1.5-fold decrease in the isosteric heats of adsorption of triethylamine.