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Facet effect of Co3O4 nanocatalysts on the catalytic decomposition of ammonium perchlorate.

Authors
  • Zhou, Linyu1
  • Cao, Shaobo1
  • Zhang, Liangliang2
  • Xiang, Guolei3
  • Wang, Jiexin1
  • Zeng, Xiaofei1
  • Chen, Jianfeng1
  • 1 State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, PR China; Research Center of the Ministry of Education for High Gravity Engineering and Technology, Beijing University of Chemical Technology, Beijing, 100029, PR China. , (China)
  • 2 State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, PR China; Research Center of the Ministry of Education for High Gravity Engineering and Technology, Beijing University of Chemical Technology, Beijing, 100029, PR China. Electronic address: [email protected] , (China)
  • 3 State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, PR China. , (China)
Type
Published Article
Journal
Journal of hazardous materials
Publication Date
Feb 19, 2020
Volume
392
Pages
122358–122358
Identifiers
DOI: 10.1016/j.jhazmat.2020.122358
PMID: 32109796
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Crystal facets can affect the catalytic decomposition of ammonium perchlorate, but the underlying mechanisms have long remained unclear. Here, we use the nanorods, nanosheets and nanocubes of Co3O4 catalysts exposing {110}, {111} and {100} facets as model systems to investigate facet effects on catalytic AP decomposition. The peak temperature of high temperature decomposition (HTD) process (THTD) of AP by nanorods, nanosheets and nanocubes Co3O4 decrease from 437.0 °C to 289.4 °C, 299.9 °C and 326.3 °C, respectively, showing obvious facet effects. We design experiments about AP decomposition under different atmospheres to investigate its mechanism and verify that the accumulation of ammonia (NH3) on AP surface can inhibit its decomposition and that the facet effects are related to the adsorption and oxidation of NH3. The binding energies of NH3 on the {110}, {111} and {100} planes calculated via density functional theory (DFT) are -1.774 eV, -1.638 eV, and -1.354 eV, respectively, indicating that the {110} planes are more favorable for the adsorption of NH3. Moreover, the {110} planes are readily to form CoNO structure, which benefits the further oxidation of the NH3. Copyright © 2020 Elsevier B.V. All rights reserved.

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