Carbothermal synthesis of porous silicon carbide using mesoporous silicas

A1 Originalartikel i en vetenskaplig tidskrift (referentgranskad)


Interna författare/redaktörer


Publikationens författare: Nataliya D. Shcherban, Svitlana M. Filonenko, Pavel S. Yaremov, Sergii A. Sergiienko, Volodymir G. Ilyin, Dmitry Yu. Murzin
Publiceringsår: 2017
Tidskrift: Journal of Materials Science
Volym: 52
Nummer: 7
Artikelns första sida, sidnummer: 3917
Artikelns sista sida, sidnummer: 3926
eISSN: 1573-4803


Abstrakt

Samples of crystal modifications of porous silicon carbide were obtained by carbothermal method using carbon precursors (sucrose, carbon) and aerosil or mesoporous silicas molecular sieves SBA-3, SBA-15, KIT-6, and MCF as silicon sources. Porous β-SiC samples obtained from carbon–silica composites are characterized by high structural and sorption characteristics ( SBET up to 410 m 2/g, Vpore up to 1.0 cm 3/g). High hydrogen adsorption capacity of silicon carbide samples based on KIT-6 (up to 1.24 wt% at 77 K and 1 atm.), considering low adsorption energy ( |Δμ0|H2) up to 2.3 kJ/mol for SiC vs. ca. 5.0 kJ/mol for carbon), was determined. The highest ever reported value among the existing porous materials was observed for specific adsorption of H 2 by SiC (specific adsorption on the pore surface, ρ up to 15 μmol/m 2) corresponding to almost complete filling of the surface with hydrogen in the examined conditions (77 K, 1 atm.).


Nyckelord

Chemical Engineering

Senast uppdaterad 2020-17-01 vid 04:11