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

Autor: Jan Kornatowski, Jerzy Włoch, Ilona Szpakowska, Maria Lezanska, Grzegorz S. Szymański
Rok vydání: 2010
Předmět:
Zdroj: Catalysis Today. 150:77-83
ISSN: 0920-5861
DOI: 10.1016/j.cattod.2009.06.020
Popis: 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.
Databáze: OpenAIRE
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