Smirnov Andrei V, Kots Pavel A, Panteleyev Maksim A, Ivanova Irina I
Department of Chemistry, Lomonosov Moscow State University Leninskiye Gory 1, bld. 3 11991 Moscow Russia.
A.V. Topchiev Institute of Petrochemical Synthesis Leninskiye prospect 29 11991 Moscow Russia.
RSC Adv. 2018 Nov 1;8(64):36970-36979. doi: 10.1039/c8ra07769j. eCollection 2018 Oct 26.
Catalytic oxidation of 1,1-dimethylhydrazine (UDMH) with molecular oxygen over Pt/SiO was studied by 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[triple bond, length as m-dash]N nitrile groups formed 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.
通过傅里叶变换红外光谱（FTIR）结合气相在线质谱监测，研究了在Pt/SiO上用分子氧催化氧化偏二甲肼（UDMH）的过程。在脉冲进料UDMH的实验中检测到一个不寻常的两步氧化过程：在新鲜铂表面上最初的UDMH氧化由于活性位点的堵塞而迅速终止；时间上分开的第二步氧化对应于表面残留物的燃烧。该残留物由非氧化UDMH转化产物（如二甲胺）分解形成的C≡N腈基组成。在很宽的反应温度和氧与UDMH比例范围内都观察到了两步氧化情况。
