American Chemical Society
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From a Novel Energetic Coordination Polymer Precursor to Diverse Mn2O3 Nanostructures: Control of Pyrolysis Products Morphology Achieved by Changing the Calcination Atmosphere

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journal contribution
posted on 2016-10-21, 00:00 authored by Dong Jing, Dong Chen, Guijuan Fan, Qi Zhang, Jinjiang Xu, Shaohua Gou, Hongzhen Li, Fude Nie
A novel strategy to fabricate diverse α-Mn2O3 nanostructures from the nitrogen-rich energetic coordination polymer (ECP) [Mn­(BTO)­(H2O)2]n (BTO = 1H,1′H-[5,5′-bitetrazole]-1,1′-bis­(olate)) has been developed by changing the pyrolysis atmosphere. The results show that the energetic constituent and calcination environment are vital factors to get quite different morphologies of pyrolysis products. When the calcination reaction occurs under N2 or O2, rod-shaped mesoporous α-Mn2O3 with a large specific surface of 50.2 m2·g–1 and monodispersed α-Mn2O3 with a size of 10–20 nm can be obtained, respectively, which provides a new platform to prepare specific shapes and sizes of manganese oxides. Inspired by the transformation of 1 under O2 atmosphere, we applied an in situ generated ultrafine α-Mn2O3 catalyst in the decomposition of ammonium perchlorate (AP) using ECP 1 as a precursor. The catalytic process of AP shows a remarkable decreased decomposition temperature (271 °C) and a narrower decomposition interval (from 253 to 275 °C). To our best knowledge, with such a low metal loading (0.65 wt %), the catalytic performance of in situ generated monodispersed ultrafine α-Mn2O3 is by far the best, which suggests that this ultraefficient catalyst has great potential in AP-based propellants.