Catalysis of HMX Decomposition and Combustion

Defect Chemistry Approach

Book chapter (2016)

Authors

Alla N. Pivkina Russian Academy of Sciences
Nikita V. Muravyev Russian Academy of Sciences
Konstantin A. Monogarov Russian Academy of Sciences
Igor V. Fomenkov Zelinsky Institute of Organic Chemistry
J. Schoonman ChemE/Materials for Energy Conversion and Storage - AS
Research Group
ChemE/Materials for Energy Conversion and Storage (AS) (TU Delft)
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Published Date

2016

Language

English

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Faculty

Applied Sciences

Department

ChemE/Chemical Engineering

Research Group

ChemE/Materials for Energy Conversion and Storage

Abstract

The influence of nanosized oxides of Ti, Al, Fe, and Si on the HMX thermolysis and combustion is reported. The following order of their catalytic efficiency in HMX thermolysis was obtained: TiO2>Fe2O3≈Al2O3>SiO2. The catalytic performance was analyzed and the key factors were shown to be specific surface area, content, and the acid/base properties of the metal oxide surface. Results reveal the burning rate increases and the pressure exponent decreases considerably by the addition of exceptionally nano-TiO2.Since in catalysis reactions occur at interfaces, point defects in the catalyst material are to be considered in the interfacial catalysis mechanism. Intrinsic and extrinsic point defects in TiO2 are discussed. The presence of acidic or basic surface groups influences the space charges and hence the catalytic efficiency.Based on the experimental results, the physicochemical model (scenario) of the decomposition and combustion of the HMX/TiO2 mixtures is elaborated.