Modelling of water adsorption–condensation isotherms on beds of nanoparticles

Ribeyre, Quentin; Grévillot, Georges; Charvet, Augustin; Vallières, Cécile; Thomas, Dominique

doi:10.1016/j.ces.2014.03.027

Cited by 10 publications

(13 citation statements)

References 21 publications

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“…Apart from the food product the model is also used for different kind of adsorbents e.g. bentonite (Mihoubi and Bellagi 2006), nanoparticles (Ribeyre et al 2014) and lignite (Pakowski et al 2011) etc. The GAB model is an improvement of the BET theory and shares two of its constants (i) 'M m ' the monolayer capacity, and (ii) 'C' the analogous formulation of the BET constant C BET .…”

Section: Modelling Of Sorption Isothermsmentioning

confidence: 99%

Insights of water vapor sorption onto polymer based sorbents

et al. 2015

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Two polymer based sorbents PS-I and PS-II are analyzed for water sorption applications. Adsorption/desorption isotherms of water vapor onto PS-I and PS-II have been experimentally measured using a magnetic suspension adsorption measurement unit for adsorber temperature ranges 20-80°C and evaporator temperature ranges 2-73°C. The equilibrium adsorption uptake of water vapors corresponding to saturation condition at 30°C by PS-I and PS-II was found nearly 2 and 2.5 times higher than the conventional silica-gel, respectively. Adsorption data has been analyzed for various adsorption models which include Brunauer-Emmett-Teller (BET); Freundlich; DubininAstakhov (D-A); Oswin; and Guggenheim-Anderson-de Boer (GAB) model. The GAB and BET model give the good fit for relative pressure range of 0.10-0.90 and 0.05-0.35, respectively. At all adsorption temperatures of both sorbents, the monolayer uptake by the GAB model is found higher than the BET model. Effect of adsorption potential on adsorption uptake is highlighted in relation with water vapor adsorption mechanism. The isosteric heat of water vapor adsorption is determined for both sorbents using Clausius-Clapeyron equation.

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Section: Modelling Of Sorption Isothermsmentioning

confidence: 99%

Insights of water vapor sorption onto polymer based sorbents

et al. 2015

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“…A Setaram microbalance and a Wetsys_ generator were used to determine the powders' sorption isotherms. The experimental protocol described in Ribeyre et al (2014) was used to obtain the water mass sorbed by these samples. Fig.…”

Section: Sample Characterizationmentioning

confidence: 99%

“…1 presents the experimental and modelled mass of water sorbed by mass of dry sample versus the water activity: Figure 1. Zinc-Aluminium, Aerosil 200 and Xe2 PRINTEX water sorption isotherms (Ribeyre et al 2014).…”

Section: Sample Characterizationmentioning

confidence: 99%

“…Beyond a water activity of 0.7, each sample shows a rapid increase of the sorbed amount. Proving that, capillary condensation was the dominant phenomenon rather than multilayer adsorption (Ribeyre et al 2014).…”

Section: Sample Characterizationmentioning

confidence: 99%

“…Then, the cake porosity was evaluated using thickness variations and an Adsorption-Condensation Model (ACM) developed in a previous study (Ribeyre et al 2014). Finally, a pressure drop model that took into account the cake porosity and cake thickness under humidity was proposed and compared to experimental data.…”

Section: Introductionmentioning

confidence: 99%

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Impact of relative humidity on a nanostructured filter cake – Experimental and modelling approaches

Ribeyre

Charvet

Vallières

et al. 2017

Chemical Engineering Science

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In this paper, three different non-hygroscopic nanostructured powders were dispersed in dry air and filtered to create a nanostructured deposit. The relative humidity was then gradually increased from 0 to 85% and the thickness of the deposit continuously measured using a laser trigonometry device. Experimental results showed that for each sample, the pressure drop of the deposit increases when the relative humidity increases, while the bed thickness decreases. The modelling of the pressure drop upon increasing humidity was conducted using two pressure drop models available in the literature and specifically developed for nanostructured deposits. The variations in porosity and in cake thickness were included in the pressure drop models. This was achieved using a semi-predictive model of adsorption-condensation on nanoparticle beds developed to calculate the water mass sorbed by a powder. The modified models represent the experimental results with a maximum deviation of 10%. HIGHLIGHTS ► Pressure drop and thickness variations of a humid nanostructured deposit are presented. ► An equation allowing porosity determination for a humid nanostructured deposit is proposed. ► The porosity equation was implemented in two pressure drop models. ► A good match between modelled and experimental results was found.

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Filtration of Solid Aerosols

Thomas¹

2017

Aerosol Filtration

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Modelling of water adsorption–condensation isotherms on beds of nanoparticles

Cited by 10 publications

References 21 publications

Insights of water vapor sorption onto polymer based sorbents

Insights of water vapor sorption onto polymer based sorbents

Impact of relative humidity on a nanostructured filter cake – Experimental and modelling approaches

Filtration of Solid Aerosols

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