Solubility and diffusivity of oxygen and chlorine in aqueous hydrogen peroxide solutions

Ruiz-Ibanez, Gabriel; Bidarian, Ali; Davis, Richard A.; Sandall, Orville C.

doi:10.1021/je00004a033

Cited by 12 publications

(4 citation statements)

References 8 publications

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“…In a laminar liquid jet absorber, the rate of gas absorption in a flowing liquid stream is measured. [ 61 ] The penetration theory is then used to estimate gas diffusivity. The same approach is used with gas diffusing into a liquid film over a wetted‐sphere.…”

Section: Methods For Diffusivity Determinationmentioning

confidence: 99%

Experimental determination of gas diffusivity in liquids—A review

Upreti

Mehrotra

2021

Can J Chem Eng

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Unit operations and processes abound with gas diffusion in liquids, which is a sophisticated phenomenon in which mass transfer is characterized by diffusion coefficient or diffusivity. Compared to diffusion in gas phase, the closely packed liquid molecules strongly influence diffusive mass transfer to the extent that it is impossible to have a general theory for a reasonably accurate estimation of diffusivity in liquids. This situation is further compounded by the fact that diffusivity cannot be measured directly but can only be estimated indirectly with the help of a number of observable properties (eg, mass, volume, pressure, etc). This fact gives rise to a myriad of experimental methods for the determination of gas diffusivity in liquids. These methods report gas diffusivities over widely varying ranges of temperature, pressure, and liquid composition. To provide a state‐of‐the‐art knowledge base for such methods is the objective of this work. The focus is on gas diffusion in binary gas‐liquid systems. Starting with necessary theoretical foundations, we provide a systematic categorization of these methods based on the property change utilized for diffusivity determination. The methods are then concisely described, and the diffusivity data are summarized for over 160 gas‐liquid systems at different temperature and pressure conditions. Empirical correlations are provided for different gas‐liquid systems, which could be used for interpolating gas diffusivity as a function of temperature, pressure, and composition.

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Section: Methods For Diffusivity Determinationmentioning

confidence: 99%

Experimental determination of gas diffusivity in liquids—A review

Upreti

Mehrotra

2021

Can J Chem Eng

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“…The possible reason is that the increasing H 2 O 2 concentration enhances electrolyte viscosity. The increasingly sluggish diffusion of O 2 in the H 2 O 2 solution subsequently deteriorates the ORHP current 53 . This speculation was further verified by the observation that there was no current drop after changing to a fresh electrolyte.…”

Section: Photon Energy (Ev)mentioning

confidence: 99%

Building and identifying highly active oxygenated groups in carbon materials for oxygen reduction to H2O2

et al. 2020

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The one-step electrochemical synthesis of H 2 O 2 is an on-site method that reduces dependence on the energy-intensive anthraquinone process. Oxidized carbon materials have proven to be promising catalysts due to their low cost and facile synthetic procedures. However, the nature of the active sites is still controversial, and direct experimental evidence is presently lacking. Here, we activate a carbon material with dangling edge sites and then decorate them with targeted functional groups. We show that quinone-enriched samples exhibit high selectivity and activity with a H 2 O 2 yield ratio of up to 97.8 % at 0.75 V vs. RHE. Using density functional theory calculations, we identify the activity trends of different possible quinone functional groups in the edge and basal plane of the carbon nanostructure and determine the most active motif. Our findings provide guidelines for designing carbon-based catalysts, which have simultaneous high selectivity and activity for H 2 O 2 synthesis.

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“…where S + = 0.074 m3/kmol for K+ and S -= 0.021 m3/kmol for HCO;, whereas S, = 0.091 mykmol for Naf and S -= 0.066 m3/kmol for OH- (Danckwerts, 1970), and the estimates of S, for C1, at different temperatures were obtained from the paper by Ruiz-Ibanez et al (1991). Ruiz-Ibanez et al (1991) reported values for HP and S , over the temperature range of 283-298 K. Their results were extrapolated up to 313 K for our work. The ionic strength of the aqueous electrolyte solution, I, is defined in terms of the concentrations of the ionic species that are present in the solution, ci, and their valences, zi, according to the following equation:…”

Section: Physicochemical Propertiesmentioning

confidence: 99%