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Degradation of gaseous unsymmetrical dimethylhydrazine by vacuum ultraviolet coupled with MnO2


Huang, Yuanzheng; Jia, Ying; Zhang, Yong-yong; Hou, Li-an (2020), Degradation of gaseous unsymmetrical dimethylhydrazine by vacuum ultraviolet coupled with MnO2, Dryad, Dataset,


In this study, α-, β-, and δ-MnO2 were prepared by a uniform hydrothermal method and then coupled with vacuum ultraviolet (VUV) for the degradation of gaseous unsymmetrical dimethylhydrazine (UDMH). The performance in the remove of UDMH, by-products distribution and mechanistic insights were systematically investigated. The catalysts were characterized by X-ray diffraction (XRD), N2 adsorption/desorption, Field Emission Scanning Electron Microscopy (FE-SEM), Raman, thermal gravimetric (TG), X-ray photoelectron spectroscopy (XPS) and Fourier-transform infrared (FTIR) to investigate the factors affecting the catalytic activity. The results showed that O2 and H2O were essential for the remove of UDMH . The integrated process considerably improved the remove and mineralization of UDMH by ozone catalytic oxidation . There were more reactive oxygen species generated in the integrated process. The catalytic activity of the prepared catalysts following the order: δ-MnO2 >α-MnO2 >β-MnO2. δ-MnO2 displayed the highest remove rate of 100% and CO2 concentration of 42 ppmv. The good performance of δ-MnO2 was attributed to high specific surface area and surface oxygen vacancies.

Usage Notes

XRD data
The raw data of XRD patterns belong to MnO2 (Fig.2).

N2 adsorption-desorption isotherms
N2 adsorption−desorption isotherms of α-, β- and δ-MnO2 (Fig.3).

Raman Spectroscopy
Raman spectra of α-, β- and δ-MnO2 (Fig.5).

FTIR spectroscopy
FTIR spectra of α-, β-, δ-MnO2 and α-MnO2 after the reaction (Fig.6).

TG analyses curves of α-, β-, and δ-MnO2 (Fig.7).

Mn 2p2/3, Mn 3s and O 1s XPS spectra of α-, β-, and δ-MnO2 (Fig.8).

Degradation of UDMH
The data and calculations of the degradation of UDMH and the concentration of CO2 in the continuous flow fixed-bed steel reactor.

GC-MS spectra
GC-MS spectra of organic products from (a) VUV photolysis and (b) VUV/MnO2 process (Fig.12).


National Natural Science Foundation of China, Award: 21875281