Influence of Thermal Diffusion on the Hysteresis Area of Hydrogen Impurities’ Catalytic Combustion on Platinum Wire

Калінчак, В. В.; Софронков, А. Н.; Fedorenko, Aleksey; Chernenko, A. S.

doi:10.15330/pcss.18.1.52-57

Cited by 3 publications

(6 citation statements)

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“…Critical values of catalytic wire initial temperature (ignition point, Fig. 2 ) are located within T i < T i* < T e , meeting the equation (3). Critical temperature and concentrations values are located within respective intervals, as below:…”

mentioning

confidence: 78%

Ignition and Self-Supporting Burning of Gas-Air Mixtures with Hydrogen Admixtures on Platinum Wire

Калінчак¹,

Chernenko²,

Софронков³

et al. 2017

PCSS

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The proposed work describes analytical identification of hydrogen admixture concentration and catalyst temperatures limit values beyond which catalytic flameless steady combustion of gas-air mixtures at ambient temperature at platinum wires is observed. Effect of gas-air slip velocity upon considered values is shown. Initial platinum wire preheating temperatures required for catalytic ignition are determined.

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mentioning

confidence: 78%

Ignition and Self-Supporting Burning of Gas-Air Mixtures with Hydrogen Admixtures on Platinum Wire

Калінчак¹,

Chernenko²,

Софронков³

et al. 2017

PCSS

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“…Time dependence of temperature on metallic catalyst resistance is defined from hysteretic non-stationery heat balance equation [8]:…”

Section: Forced Catalytic Ignitionmentioning

confidence: 99%

“…The critical values of the concentration , ai e Y and gasair mixture's temperature , g i e T can be obtained [8,9] from the condition of extrema on the dependences Tg(T) ( Equations (8) and (9) constitute a system of parametric equations (parameter -catalyst temperature). For a given gas-air mixture temperature with an hydrogen admixture (Tg = 293 K and Sh = 0.51), the its system's solution is presented in Fig.…”

Section: Self-sustaining Catalytic Combustionmentioning

confidence: 99%

“…The upper steady mode is described by linear relation of flameless combustion temperature and combustible gas admixture content for thin filament, where heat losses with radiation may be ignored [7]. It is also possible to use the linear dependence of the flameless combustion temperature on the heating current's square or the gas stream's temperature at a constant impurity concentration [8,9].…”

Section: Introductionmentioning

confidence: 99%

“…Works [7][8][9] are focused on hysteretic nature of relation between filament temperature and system's ambient parameters. It is caused by non-linear relation chemical heat emission intensity and temperature.…”

Section: Introductionmentioning

confidence: 99%

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Electric resistence hysteresis of platinum filament in chilled air/hydrogen mixtures

Калінчак

Черненко

Fedorenko

2020

Phys. Chem. Solid St.

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Ignition of gaseous combustible mixtures on catalytically active hot solid surfaces has numerous applications in many industrial processes and is a complex process that involves close interaction between surface processes and transfer processes in the gas mixture. In this paper, stable and critical states catalytic oxidation of hydrogen impurities in air on a platinum filament are considered. It is shown that filament temperature and its resistance depending on the mixture temperature and hydrogen concentration are of the hysteresis features. Within this hysteresis region, it is possible to achieve the catalytic combustion mode of hydrogen as a result preheating the catalyst filament above a certain critical value. The dependence of the limiting hydrogen's concentration on catalyst filament's diameter, above which is observed in the cold gas mixture self-sustaining catalytic combustion without electric current.

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About the Possibility of Using Thermochemical Gas Analyzers in a Multicomponent Mixture

Chernenko¹,

Калінчак²,

Roziznany³

et al. 2023

SEMST

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Kinetic parameters finding’s method of heterogeneous catalytic oxidation reactions of combustible gas’s small impurities in air on a thin platinum wire was described. It consists in obtaining from the wire’s current-voltage characteristic the dependence of the critical current values on its mass fraction in air. They corresponding to the catalytic ignition and extintion of the gas impurity. A method of determining the content of two combustible gases in the air, what based on processing the platinum wire’s current-voltage characteristic, was proposed. Depending on the level of the total gases concentration in the air, the determining experimental characteristics are not only the wire (catalyst) overheating relative to the inert wire under the conditions of catalytic ignition, but also the wire overheating during catalytic extinguishing or under conditions of self-sustaining catalytic combustion (without electric current heating).

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Influence of Thermal Diffusion on the Hysteresis Area of Hydrogen Impurities’ Catalytic Combustion on Platinum Wire

Cited by 3 publications

References 0 publications

Ignition and Self-Supporting Burning of Gas-Air Mixtures with Hydrogen Admixtures on Platinum Wire

Ignition and Self-Supporting Burning of Gas-Air Mixtures with Hydrogen Admixtures on Platinum Wire

Electric resistence hysteresis of platinum filament in chilled air/hydrogen mixtures

About the Possibility of Using Thermochemical Gas Analyzers in a Multicomponent Mixture

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