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Mechanistic study of 1,1-dimethylhydrazine transformation over Pt/SiO(2) catalyst

Catalytic oxidation of 1,1-dimethylhydrazine (UDMH) with molecular oxygen over Pt/SiO(2) 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...

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Autores principales: Smirnov, Andrei V., Kots, Pavel A., Panteleyev, Maksim A., Ivanova, Irina I.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9089307/
https://www.ncbi.nlm.nih.gov/pubmed/35558958
http://dx.doi.org/10.1039/c8ra07769j
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author Smirnov, Andrei V.
Kots, Pavel A.
Panteleyev, Maksim A.
Ivanova, Irina I.
author_facet Smirnov, Andrei V.
Kots, Pavel A.
Panteleyev, Maksim A.
Ivanova, Irina I.
author_sort Smirnov, Andrei V.
collection PubMed
description Catalytic oxidation of 1,1-dimethylhydrazine (UDMH) with molecular oxygen over Pt/SiO(2) 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[triple bond, length as m-dash]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.
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spelling pubmed-90893072022-05-11 Mechanistic study of 1,1-dimethylhydrazine transformation over Pt/SiO(2) catalyst Smirnov, Andrei V. Kots, Pavel A. Panteleyev, Maksim A. Ivanova, Irina I. RSC Adv Chemistry Catalytic oxidation of 1,1-dimethylhydrazine (UDMH) with molecular oxygen over Pt/SiO(2) 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[triple bond, length as m-dash]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. The Royal Society of Chemistry 2018-11-01 /pmc/articles/PMC9089307/ /pubmed/35558958 http://dx.doi.org/10.1039/c8ra07769j Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/
spellingShingle Chemistry
Smirnov, Andrei V.
Kots, Pavel A.
Panteleyev, Maksim A.
Ivanova, Irina I.
Mechanistic study of 1,1-dimethylhydrazine transformation over Pt/SiO(2) catalyst
title Mechanistic study of 1,1-dimethylhydrazine transformation over Pt/SiO(2) catalyst
title_full Mechanistic study of 1,1-dimethylhydrazine transformation over Pt/SiO(2) catalyst
title_fullStr Mechanistic study of 1,1-dimethylhydrazine transformation over Pt/SiO(2) catalyst
title_full_unstemmed Mechanistic study of 1,1-dimethylhydrazine transformation over Pt/SiO(2) catalyst
title_short Mechanistic study of 1,1-dimethylhydrazine transformation over Pt/SiO(2) catalyst
title_sort mechanistic study of 1,1-dimethylhydrazine transformation over pt/sio(2) catalyst
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9089307/
https://www.ncbi.nlm.nih.gov/pubmed/35558958
http://dx.doi.org/10.1039/c8ra07769j
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