Molecular reducing pore entrance size

The pyrolysis of benzene over the active carbon surface results in the deposition of the carbon on the surface of the substrate carbon as weU as in the microporous system and at some preferred sites. The adsorption isotherms of organic molecules of varying sizes and shapes indicated that the carbon gets deposited preferentially in the pore entrances reducing entrance diameter resulting in the formation of carbon molecular sieves. Pore-size distribution curves indicated that the treatment with benzene between 3 and 6 hrs reduces the mean pore dimensions to 0.6 nm, and a larger time of treatment reduces pore entrances to less than 0.6 nm. 

Encapsulating Molecular Catalyst in Nanoreactors by Reducing the Pore Entrance Size... 

A preformed molecular catalyst is first adsorbed into the nanocages of MS (SBA-16 or FDU-12), followed by finely reducing the size of pore entrance by a silylation reaction according to the molecular size and properties of the catalyst, reactants, and products, to prevent the molecular catalyst from leaching out of the nanocages (Scheme 10.9) [65]. Thereby, the molecular catalyst is confined in the mesoporous... 

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