Kinetic Coupling of Steady-State Dry Reforming of Methane and Self-Oscillating Partial Oxidation of Methane over Nickel

IF 1.3 4区化学 Q4 CHEMISTRY, PHYSICAL Kinetics and Catalysis Pub Date : 2024-09-04 DOI:10.1134/s002315842460175x

V. Yu. Bychkov, Yu. P. Tulenin, Yu. A. Gordienko, O. N. Sil’chenkova, V. N. Korchak

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Abstract

The occurrence of dry reforming of methane (DRM) in a steady-state mode and partial oxidation of methane (POM) in a self-oscillating mode over a nickel foil sample and the simultaneous occurrence of these two reactions have been studied. It has been shown that during the cooccurrence of the DRM and POM reactions, a kinetic coupling of these reactions takes place; it is evident as a change in the self-oscillation period and a significant acceleration of the DRM reaction in certain phases of the self-oscillation cycle compared with the DRM rate over this Ni sample in a steady-state mode. The DRM acceleration effect is observed in a temperature range of 600–750°C. The maximum increase in the CO₂ conversion value averaged over the oscillation period is a factor of 2.6 at a temperature of 700°C for a feed gas mixture composition of CH₄ : CO₂ = 1 : 1 + 3.5% O₂. In addition, the effect of O₂ concentration in a range of 0.5–3.5% on the increase in the DRM rate has been studied. An interpretation of the observed effects has been proposed.

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甲烷在镍上的稳态干法重整与甲烷的自振荡部分氧化的动力学耦合

摘要研究了在镍箔样品上以稳态模式发生的甲烷干重整（DRM）和以自振模式发生的甲烷部分氧化（POM），以及这两种反应同时发生的情况。研究表明，在 DRM 和 POM 反应同时发生期间，这两种反应发生了动力学耦合；这表现为自振荡周期的变化，以及在自振荡周期的某些阶段，与稳态模式下该镍样品上的 DRM 反应速率相比，DRM 反应明显加速。在 600-750°C 的温度范围内观察到了 DRM 加速效应。在 CH4 : CO2 = 1 : 1 + 3.5% O2 的原料气混合物成分条件下，700°C 的温度下 CO2 转化值的最大增幅为 2.6 倍。此外，还研究了 0.5%-3.5%范围内的氧气浓度对 DRM 增长率的影响。对观察到的影响提出了解释。

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来源期刊

Kinetics and Catalysis 化学-物理化学

CiteScore

2.10

自引率

27.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Kinetics and Catalysis Russian is a periodical that publishes theoretical and experimental works on homogeneous and heterogeneous kinetics and catalysis. Other topics include the mechanism and kinetics of noncatalytic processes in gaseous, liquid, and solid phases, quantum chemical calculations in kinetics and catalysis, methods of studying catalytic processes and catalysts, the chemistry of catalysts and adsorbent surfaces, the structure and physicochemical properties of catalysts, preparation and poisoning of catalysts, macrokinetics, and computer simulations in catalysis. The journal also publishes review articles on contemporary problems in kinetics and catalysis. The journal welcomes manuscripts from all countries in the English or Russian language.