Ordered Mesoporous Carbons with Graphitic Pore Wall

4 Ordered Mesoporous Carbons with Graphitic Pore Wall 

The methods mentioned above for the preparation of ordered graphitic mesoporous carbon involve the use of liquid impregnation strategies (repeated infiltration and polymerisation) followed by the carbonisation 

SBA-15, MCM-48, HMS and MCM-41. Xia etal. also used CVD with acetonitrile as precursor to prepare graphitic mesoporous carbon materials with diverse morphologies, such as sphere, hollow sphere, rod and nano-tubeP Su et al. used a similar CVD method and benzene as 

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Kim, T.-W., Park, I.S., and Ryoo, R. (2003). A synthetic route to ordered mesoporous carbon materials with graphitic pore walls. Angew. Chem., 42, 4375-9. 

Xia Y, Mokaya R. Synthesis of ordered mesoporous carbon and nitrogen-doped carbon materials with graphitic pore walls via a simple chemical vapor deposition method. Adv Mater 2004 16 1553-8. 

Rao and Sircar [5-7] introduced nanoporous supported carbon membranes which were prepared by pyrolysis of PVDC layer coated on a macroporous graphite disk support. The diameter of the macropores of the dried polymer film was reduced to the order of nanometer as a result of a heat treatment at 1,000°C for 3 h. These membranes with mesopores could be used to separate hydrogen-hydrocarbon mixtures by the surface diffusion mechanism, in which gas molecules were selectively adsorbed on the pore wall. This transport mechanism is different from the molecular sieving mechanism. Therefore, these membranes were named as selective sitrface flow (SSF ) membranes. It consists of a thin (2-5 pm) layer of nanoporous carbon (effective pore diameter in the range of 5-6 A) supported on a mesoporous inert support such as graphite or alumina (effective pore diameter in the range of 0.3-1.0 pm). The procedures for making the selective surface flow membranes were described in [5, 7]. In particular, the requirements to produce a surface diffusion membrane were shown clearly in [7]. 

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