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

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 FeCl3 (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 FeCl3/g silica exhibited the best structure ordering, reflected in the narrowest pore size distribution (centred at 4.3 nm), a0 = 20.54 nm, and SBET = 1313 m2/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 SO2 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.