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Mechanistic study of 1,1-dimethylhydrazine transformation over Pt/SiO₂ catalyst

Author:
Smirnov, Andrei V., Kots, Pavel A., Panteleyev, Maksim A., Ivanova, Irina I.
Source:
RSC advances 2018 v.8 no.64 pp. 36970-36979
ISSN:
2046-2069
Subject:
Fourier transform infrared spectroscopy, active sites, catalysts, combustion, dimethylamine, gases, monitoring, oxygen, platinum, silica, temperature
Abstract:
Catalytic oxidation of 1,1-dimethylhydrazine (UDMH) with molecular oxygen over Pt/SiO₂ was studied by in situ FTIR spectroscopy coupled with online MS monitoring of the gas phase. An unusual two-step oxidation process was detected in experiments with the pulse UDMH feeding: initial UDMH oxidation over a fresh platinum surface quickly terminates due to the blockage of active sites; a time-separated second oxidation step corresponds to combustion of the surface residue. This residue consists of CN nitrile groups formed via decomposition of the products of non-oxidative UDMH conversion, such as dimethylamine. The two-step oxidation picture is observed over a broad range of reaction temperatures and oxygen to UDMH ratios.
Agid:
6202874