Selective Template Removal by Thermal Depolymerization to Obtain Mesostructured Molybdenum Oxycarbide12. Issue 10 (17th July 2015)

• Record Type: Journal Article
• Authors: Schieder, Martin; Lunkenbein, Thomas; Bojer, Carina; Dulle, Martin; vom Stein, Julia; Auffermann, Gudrun; Löbling, Tina; Schöbel, Judith; Schmalz, Holger; Breu, Josef
• Is Part Of: Zeitschrift für anorganische und allgemeine Chemie. Volume 641:Issue 10(2015)
• Page Start: 1829
• Page End: 1834
• Publication Date: 2015-07-17
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry -- Periodicals; 540
• DOI: 10.1002/zaac.201500219
• Languages: English
• ISSNs: 0044-2313

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p> The carbon content of mesostructured organic‐inorganic hybrid material of a cylindrical block copolymer template of poly(2‐vinylpyridine)‐<italic>block</italic>‐poly(allyl methacrylate) (P2VP‐<italic>b</italic>‐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 MoO<italic>_x</italic>C<italic>_y</italic> 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<bold>·</bold>mol^–1.</p> </abstract>