Corona Discharge Effects in Gas-Solid Adsorption: Water Vapor on Silica Gel and Fly Ash

Someshwar, Arun V.; Peshori, D.L.

doi:10.1080/00986448708911829

Cited by 3 publications

(4 citation statements)

References 8 publications

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“…The charged droplets are then driven to the ground electrode. Such a phenomenon is likely due to a redistribution of the water vapor concentration profiles when a humid stream is subjected to an ionic discharge (Someshwar and Peshori, 1987). This could account for the droplet formation so clearly observed in the work of Matteson et al (1972).…”

Section: Discussionmentioning

confidence: 87%

Absorption characteristics of sulfur dioxide in water in the presence of a corona discharge

Someshwar¹

1988

Ind. Eng. Chem. Res.

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The absorption characteristics of sulfur dioxide into a stagnant body of distilled water are investigated in the presence of point-plane ionic discharges in a closed chamber at 30 ± 0.1 °C. S02 removal is seen to be enhanced when the liquid surface is subjected to the discharge, with the bulk of the enhancement resulting in acidic deposition within the chamber. Gas-phase oxidation of S02 in the absence of liquid water is seen to be minimal. The effects of varying the discharge intensity and polarity and gas oxygen content on the observed absorption rate enhancements are reported.

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Section: Discussionmentioning

confidence: 87%

Absorption characteristics of sulfur dioxide in water in the presence of a corona discharge

Someshwar¹

1988

Ind. Eng. Chem. Res.

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“…The details of the experimental set-up and the experimental results have been presented elsewhere [20,21]. All the experiments were performed in a coaxial plasma-catalytic reactor (figure 1).…”

Section: Experimental Set-up Conditions Catalysts and Resultsmentioning

confidence: 99%

“…The explanation to elucidate this behavior was either an electro-convective flow caused by the diffusion of polar water vapor molecules in the presence of highly non-uniform electric fields, and a reduction of vapor pressure above the capillary in the discharge zone, due either to a screening of the capillary charge of high density, or by sorption of vapor molecules on nuclei (ions) produced in the discharge. A fundamental study of the effect of corona discharge on the adsorption-desorption of water vapor on microporous silica and mesoporous fly ash, performed by Someshwar and Peshori [21] showed a significant decrease of water adsorption capacity for both materials. According to the authors, this is due to the alteration of the thermodynamic equilibrium.…”

Section: Introductionmentioning

confidence: 99%

Electrocatalytic reduction of carbon dioxide under plasma DBD process

Amouroux¹,

Cavadias²

2017

J. Phys. D: Appl. Phys.

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Carbon dioxide can be converted, by reaction with hydrogen, into fine chemicals and liquid fuels such as methanol and DME. Methane production by the Sabatier reaction opens the way of carbon recycling for a circular economy of carbon resources. The catalytic process of methanation of carbon dioxide produces two molecules of water as a by-product. A current limitation in the CO2 methanation is the ageing of catalysts, mainly due to water adsorption during the process. To avoid this adsorption, the process is operated at high temperature (300 °C–400 °C), leading to carbon deposition on the catalyst and its deactivation. To overcome this problem, a methanation plasma-catalytic process has been developed, which achieves high CO2 conversion rate (80%), and a selectivity close to 100%, working from room temperature to 150 °C, instead of 300 °C–400 °C for the thermal catalytic process. The main characteristics of this process are high-voltage pulses of few nanoseconds duration, activating the adsorption of CO2 in bent configuration and the polarization of the catalyst. The key step in this process is the desorption of water from the polarized catalyst. The high CO2 conversion at low temperature could be explained by the creation of a plasma inside the nanopores of the catalyst.

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“…An excellent review of the experimental data on hysteresis, particularly on the water-silica gel system, is given by Gregg and Sing (1982). For various silica gels prepared under different conditions, the hysteresis effects are similar for water sorption (Rao, 1939;Sing and Madeley, 1954;Mikhail and Schebl, 1970;Baker and Sing, 1976;Nonaka and Ishizaki, 1977;Naono et al, 1980;Someshwar and Peshori, 1987).…”

Section: Introductionmentioning

confidence: 99%

A simple model and experiments for adsorption‐desorption hysteresis: Water vapor on silica gel

Rajniak

Yang

1993

AIChE Journal

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A simple model is proposed for the evaluation of the primary and secondary adsorption and desorption processes for hysteresis-dependent sorption systems. The model is based on the use of pore blocking interpretation of hysteresis in an interconnected network of pores. The model is simple to use and requires only the primary adsorption and primary desorption isotherms to predict all secondary desorption and adsorption isotherms. A complete set of equilibrium adsorption-desorption curves covering the hysteresis loop (appearing in the range of relative pressure 0.3-0.7) was measured for water vapor on silica gel at 25°C. The usefulness of the model is supported by its agreement with experimental data.

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Corona Discharge Effects in Gas-Solid Adsorption: Water Vapor on Silica Gel and Fly Ash

Cited by 3 publications

References 8 publications

Absorption characteristics of sulfur dioxide in water in the presence of a corona discharge

Absorption characteristics of sulfur dioxide in water in the presence of a corona discharge

Electrocatalytic reduction of carbon dioxide under plasma DBD process

A simple model and experiments for adsorption‐desorption hysteresis: Water vapor on silica gel

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