Properties of CMK-8 carbon replicas obtained from KIT-6 and pyrrole at various contents of ferric catalyst

• Published in: Catalysis today 2010-02, Vol.150 (1), p.77-83
• Main Authors: Lezanska, Maria, Wloch, Jerzy, Szymański, Grzegorz, Szpakowska, Ilona, Kornatowski, Jan
• Format: Article
• Language: English
• Subjects: Carbon replicas; Catalysis; Chemistry; Colloidal state and disperse state; Exact sciences and technology; FeCl 3 catalyst; General and physical chemistry; KIT-6; Liquid phase SO 2 oxidation; Nitrogen-containing carbons; Ordered mesoporous materials; Porous materials; Sorption properties; Surface physical chemistry; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
• ISSN: 0920-5861; 1873-4308
• DOI: 10.1016/j.cattod.2009.06.020

The CMK-8 carbons were synthesised using two KIT-6 silica matrices exhibiting well-ordered structures. With increasing synthesis temperature, the BET surface area and micropore volume diminished while the average size of mesopores increased. Among the replicas of KIT-6(1 2 0), the one synthesised using the largest amount of FeCl 3 (2.00 g/g silica) showed the best structure ordering. The opposite trend was observed for carbons derived from KIT-6(1 0 0): the replica prepared with use of 0.75 g FeCl 3/g silica exhibited the best structure ordering, reflected in the narrowest pore size distribution (centred at 4.3 nm), a 0 = 20.54 nm, and S BET = 1313 m 2/g. This was due to an appropriate geometric relationship between the pore size and wall thickness of the matrix. The replicas of KIT-6(1 2 0) appeared to have a more homogenous pseudo-graphitic character. All the replicas exhibited high catalytic activity in oxidation of SO 2 in a liquid phase. The catalytic activity process does not directly correlate with the total nitrogen content; it relates to nitrogen of the quaternary type and depends on external surface areas of the samples studied.