1. Selective Template Removal by Thermal Depolymerization to Obtain Mesostructured Molybdenum Oxycarbide
- Author
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Holger Schmalz, Tina I. Löbling, Gudrun Auffermann, Josef Breu, Martin Schieder, Judith Schöbel, Julia vom Stein, Martin Dulle, Carina Bojer, and Thomas Lunkenbein
- Subjects
chemistry.chemical_element ,Activation energy ,Arrhenius plot ,Catalysis ,law.invention ,Inorganic Chemistry ,chemistry ,Chemical engineering ,Thermal depolymerization ,Molybdenum ,law ,Polymer chemistry ,Calcination ,Hybrid material ,Pyrolysis - 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 °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 °C. The activation energy was estimated from an Arrhenius Plot to be 127 kJ·mol–1.
- Published
- 2015
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