Abstract

Combustion of pyridine in rich, stoichiometric, and lean mixtures of C₅H₅N/O₂(\(\rho_\mathrm{ Py}=0.11\) and 0.15 mol/dm³; \(\rho_\mathrm{ O_2}=0.71\)–1.18 mol/dm³) diluted with argon or water vapor was investigated at uniform heating of the reactor to 823 K. Analysis of the time dependences of the temperature and pressure of the reaction mixtures revealed differences in the mechanisms of pyridine oxidation at temperature measurement with a Pt-Rh/Pt or nichrosil-nisil thermocouple introduced into the center of the reaction volume. The Pt-Rh/Pt thermocouple was found to intensify the combustion of pyridine in the near-surface region and initiate detonation of the reaction mixture. Increase in the density of the water vapor prevents detonation. Increase in the oxygen content in the reaction mixture leads to decrease in the ignition temperature of pyridine and growth of the degree of carbon burnout and of the fraction of nitrogen that had transformed into N₂. With a nichrosil-nisil thermocouple, which has no catalytic properties, the surface oxidation of pyridine on the reactor wall was shown to dominate. Results of mass spectrometry analysis show that in the presence of water vapor, the oxidation of pyridine proceeds through the formation of NH₃ as the main intermediate.

中文翻译：

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高压下在氩气和水蒸气中吡啶的表面、体积和铂引发爆轰燃烧

摘要

吡啶在 C ₅ H ₅ N/O ₂ ( \(\rho_\mathrm{ Py}=0.11\)和 0.15 mol/dm ³ ; \(\rho_\mathrm{ O_2} ) 的富、化学计量和贫混合物中的燃烧=0.71\) –1.18 mol/dm ³) 在将反应器均匀加热至 823 K 的情况下研究用氩气或水蒸气稀释。 对反应混合物温度和压力的时间依赖性的分析揭示了在使用 Pt-Rh/将 Pt 或 Nichrosil-Nisil 热电偶引入反应体积的中心。发现 Pt-Rh/Pt 热电偶会加强吡啶在近表面区域的燃烧并引发反应混合物的爆炸。增加水蒸气的密度可以防止爆炸。反应混合物中氧含量的增加导致吡啶的着火温度降低，碳燃尽程度和转化为N ₂的氮的比例增加. 使用没有催化性能的镍硅合金热电偶，反应器壁上吡啶的表面氧化显示出占主导​​地位。质谱分析结果表明，在水蒸气存在下，吡啶的氧化通过生成NH ₃作为主要中间体而进行。