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Abstract:
The carbon content of mesostructured organic-inorganic hybrid material
of a cylindrical block copolymer template of
poly(2-vinylpyridine)-block-poly(allyl methacrylate) (P2VP-b-PAMA) and
ammonium paramolybdate (APM) could be reduced by thermal
depolymerization. By calcination in vacuo at 320 degrees C the PAMA core
can be completely removed while the remaining P2VP brush preserves the
mesostructure. The P2VP-APM composite can then be carburized in-situ to
MoOxCy in a second pyrolysis step without any additional carbon source
but P2VP. The molybdenum oxycarbide nanotubes obtained, form
hierarchically porous non-woven structures, which were tested as
catalyst in the decomposition of NH3. They proved to be catalytically
active at temperatures above 450 degrees C. The activation energy was
estimated from an Arrhenius Plot to be 127 kJmol(-1).
