1994 Volume 23 Issue 1 Pages 5-8
The X- and Y-type Faujasite zeolites were modified with n-hexane plasma processing followed by thermal treatment at 600 °C to produce the carbon coated zeolites. Amount of carbon coated was up to 2.8 wt% for Ca-X zeolite, depending on the time of plasma processing. Although the pore volume of the zeolites was reduced by the carbon modification, the adsorption uptake of N2 at 30 °C increased preferentially to that of O2 and/or Ar only for the modified X-type zeolites. The increase of the N2 uptake was up to 150% for the Na-X zeolite at carbon coating around 1 wt%. Both H2O–DSC and NH3–TPD measurements supported that carbon cluster from plasma processing was present in the Faujasite cage.
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