Glass fiber materials as a new generation of structured catalysts

Gas phase nitridation of silicate fiber glass materials with ammonia:Three case studies

“…By analogy with zeolites, this could be related with the diminishing size of microcavities where hydroxyl groups are located [29,[33][34][35]. In the case of glass, there are not microcavities, but rather the regions with a less dense phase located between the layers of silicon-oxygen SiO 4 tetrahedra (a dense phase) [2,3]. Nevertheless, it can be stated that the size of a less dense phase in Zr-Si glass is smaller as compared to REM-Si, i.e., hydroxyl groups in zirconium-silicate fiber glasses are localized in a more narrow space than in the case of silicate glass modified with rare earth elements.…”

“…However, these materials are much less known in catalysis area, although they have obvious advantages such as high thermal stability (up to 1500 K), improved hydrodynamic properties, and the possibility to create new types of structured catalyst beds and catalytic reactors with new flexible designs [1,2].…”

“…In other words, more dense silicate layers alternate with less dense interspaces filled with H-bonded silanol groups. Unlike Al-silicate glass, the Zr-silicate one is characterized by a framework structure where six coordinated Zr (IV) cations serve as connectors linked with a few SiO 4 tetrahedra [2]. It was noticed [5] the similarity between the structure of SiO 4 units in silicates and SiN 4 units in silicon nitride in which oxygen or nitrogen atoms are tetrahedrally oriented around the central silicon.…”

“…DRIFT spectra of Zr-Si fiber glasses nitridated at 773 K before (1) and after H/D exchange with ND 3(2).…”

Pressure drop and mass transfer in the structured cartridges with fiber-glass catalyst

“…The first systematic research of GFCs, containing noble metals (first of all -Pt and Pd) as active components, was performed in the Boreskov Institute of Catalysis [10][11][12][13][14][15][16]. The mentioned research has led, in particular, to creation of commercial Pt-containing catalysts IC-12-S102, successfully applied in the commercial process of catalytic incineration of organic compounds in waste gases at Nizhnekamskneftekhim plant [17], and IC-12-S111, used in commercial units for abatement of exhaust gases from stationary diesel generators [18].…”