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Schieder, Martin ; Lunkenbein, Thomas ; Bojer, Carina ; Dulle, Martin ; vom Stein, Julia ; Auffermann, Gudrun ; Löbling, Tina I. ; Schöbel, Judith ; Schmalz, Holger ; Breu, Josef:
Selective Template Removal by Thermal Depolymerization to Obtain Mesostructured Molybdenum Oxycarbide.
In: Zeitschrift für anorganische und allgemeine Chemie.
Bd. 641
(2015)
Heft 10
.
- S. 1829-1834.
ISSN 1521-3749
DOI: https://doi.org/10.1002/zaac.201500219
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.