Catalytic Ignition of Deuterium–Air Mixtures Over a Metallic Rhodium Surface at Pressures of 1–2 ATM

IF 1.4 4区 化学 Q4 PHYSICS, ATOMIC, MOLECULAR & CHEMICAL
K. Ya. Troshin, N. M. Rubtsov, V. I. Chernysh, G. I. Tsvetkov, I. O. Shamshin, Yu. A. Izmaylova, A. P. Kalinin, A. A. Leont’ev, A. I. Rodionov
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Abstract

The patterns of catalytic ignition of deuterium–air mixtures above the surface of metallic rhodium at pressures of 1–2 atm and temperatures of 20–250°C using hyperspectrometers in the range of 400–1650 nm and high-speed filming have been established. It is established that the catalytic ignition of deuterium–air mixtures in the studied temperature range is observed at a deuterium content of more than 12%; and at a deuterium content of less than 12%, only intense heating of the catalytic wire is observed. It is shown that the initial ignition source occurs on the surface of the reactor. In subsequent experiments, under the same conditions, the location of the original center changes. It has been found that the upper limit of the catalytic ignition above the D2–air mixture is noticeably lower than the lower ignition limit of the H2–air mixture. Thus, D2 is more combustible than H2 over the surface of Rh at a pressure above 1 atm. The limits of catalytic ignition are even lower than 20°C, although the flame velocity in hydrogen–air mixtures and the flame temperature in these mixtures of the same composition are much higher than those of deuterium–air mixtures. The nature of the detected kinetic inverse isotope effect is probably determined by the high level of activity of rhodium deuteride in relation to the deuterium oxidation reaction.

Abstract Image

Abstract Image

金属铑表面在 1-2 ATM 压力下催化点燃氘-空气混合物
摘要 使用 400-1650 nm 范围内的高光谱仪和高速拍摄技术,确定了金属铑表面上方的氘气混合物在 1-2 atm 压力和 20-250°C 温度下的催化点火模式。结果表明,在所研究的温度范围内,当氘含量超过 12% 时,氘-空气混合物会发生催化点燃;而当氘含量低于 12% 时,只观察到催化丝的强烈加热。实验表明,最初的点火源发生在反应器的表面。在随后的实验中,在相同的条件下,原始中心的位置发生了变化。实验发现,D2-空气混合物的催化点火上限明显低于 H2- 空气混合物的点火下限。因此,在 1 atm 以上的压力下,D2 在 Rh 表面比 H2 更易燃烧。催化点火的极限甚至低于 20°C,尽管氢气-空气混合物的火焰速度和这些相同成分混合物的火焰温度比氘气混合物的火焰速度和火焰温度高得多。检测到的动力学逆同位素效应的性质可能是由氘化铑在氘氧化反应中的高活性决定的。
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来源期刊
Russian Journal of Physical Chemistry B
Russian Journal of Physical Chemistry B 化学-物理:原子、分子和化学物理
CiteScore
2.20
自引率
71.40%
发文量
106
审稿时长
4-8 weeks
期刊介绍: Russian Journal of Physical Chemistry B: Focus on Physics is a journal that publishes studies in the following areas: elementary physical and chemical processes; structure of chemical compounds, reactivity, effect of external field and environment on chemical transformations; molecular dynamics and molecular organization; dynamics and kinetics of photoand radiation-induced processes; mechanism of chemical reactions in gas and condensed phases and at interfaces; chain and thermal processes of ignition, combustion and detonation in gases, two-phase and condensed systems; shock waves; new physical methods of examining chemical reactions; and biological processes in chemical physics.
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