An easy method for the synthesis of ordered microporous carbons by the template technique

摘要

Recently we prepared a long-range ordered microporous carbon with a structural regularity of zeolite Y 1-3, This microporous carbon possesses a high BET specific surface area more than 3000 m /g and almost no mesoporosity. Furthermore, its pore size distribution is very narrow in comparison with commercial high surface area carbons and most of the pore sizes are in the range of 1.0-1.5 nm 4. Such monodispersed pore size distribution is suitable for the application to the storage media for methane gas and the electrodes of electric double-layer capacitor. However, the carbon preparation method is rather complicated, because it always requires many different types of steps as follows. Zeolite Y was impregnated with furfuryl alcohol (FA), which was polymerized inside the zeolite channels. The resulting polyfurfuryl alcohol (PFA)/zeolite composite was heated to 700 deg C and then propylene chemical vapor deposition (CVD) was performed at this temperature for 1 h. After the CVD, the composite was further heat-treated at 900 deg C and the resultant carbon was liberated from the zeolite framework by HF washing. If the use of FA could be avoided, the preparation method would become much simpler. Moreover, many laborious operations such as stirring, filtering and drying for the wet impregnation step could be omitted. Here we try to synthesize similar ordered microporous carbons only by a dry CVD process.