Web Release Date: January 31,
Synthesis and High Hydrogen Storage Capacity of Zeolite-Like Carbons Nanocast Using As-Synthesized Zeolite Templates
a
and
School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, U.K., and Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, ul. Niezapominajek 8, 30-239 Kraków, Poland
Received: August 16, 2007
In Final Form: November 19, 2007
Abstract:
As-synthesized zeolite 
has been successfully used as a template for the preparation, via chemical vapor
deposition, of well ordered zeolite-like carbon materials. The carbon materials have high surface area (1720-2535 m2/g) and high pore volume (1.09-1.56 cm3 g-1) and exhibit some zeolite-like structural ordering
replicated from the zeolite template. Carbon materials prepared at 800 and 850 
C are nongraphitic and retain
the particle morphology of the zeolite templates. Carbon prepared at 900 C contains some graphitic domains
(as indicated by XRD patterns) and irregular particles that are dissimilar to the zeolite template particles. We
observed hydrogen uptake of up to 5.3 wt % at -196 C and 20 bar, and 2.3 wt % at 1 bar, for the carbon
materials. The hydrogen uptake is dependent on the surface area of the carbons. The use of as-synthesized
(rather than calcined) zeolite significantly improves the carbon yield and reduces the number of steps in the
preparation of the templated carbons.
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