A new generation of MFI-type zeolite pellets with very high mechanical performance for space decontamination

Rioland, Guillaume; Daou, T. Jean; Faye, Delphine; Patarin, Joël

doi:10.1016/j.micromeso.2015.09.040

Cited by 24 publications

(30 citation statements)

References 36 publications

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“…10 (a)), which is redolent of a heterogeneous polymer structure [36,37], and culminated into complete degradation by 500 °C. The degradation point is similar to that of methylcellulose [38][39][40], which is remarkable considering that other high-molecularweight polymers such as carboxymethyl cellulose degrade at above 1000 °C [41,42].…”

Section: Thermogravimetric Analysissupporting

confidence: 60%

Guar gum: A novel binder for ceramic extrusion

Elbadawi

Mosalagae

Reaney

et al. 2017

Ceramics International

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Ceramic honeycomb extrusion is a technique capable of attaining high strength, porous ceramics. However, challenges prevent the realisation of its potential. These include the design of an intricate honeycomb die and the formulation of an extrudable paste. The present study addresses the latter by using guar gum (GG) as a binder. GG was rationally selected because hydrogels thereof exhibit strong shear-thinning and high stiffness properties, which are required for extrusion. Rheological analyses demonstrated ceramic pastes with similar qualities were achieved, with hydroxyapatite (HA) used as the model ceramic. The shear stiffness modulus of HA pastes was determined as 8.4 MPa with a yield stress of 1.1 kPa. Moreover, this was achieved with GG as the sole additive, which further facilitates the overall fabrication process. The binder extraction notably occurred at relatively low temperatures when other high molecular weight polymers demand temperatures above 1000 °C; therefore the latter precludes the use of ceramics with low sintering onset. The process culminated in a porous HA scaffold with similar porosity to that of a commercial HA graft, but with higher compressive strength. Lastly, the study

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Section: Thermogravimetric Analysissupporting

confidence: 60%

Guar gum: A novel binder for ceramic extrusion

Elbadawi

Mosalagae

Reaney

et al. 2017

Ceramics International

View full text Add to dashboard Cite

show abstract

“…This methodology allows the various dimensions of pellets while respecting technical constraints and at the same time ensuring good mechanical properties. The adsorption properties of the zeolite pellets were also preserved [8]. …”

Section: Resultsmentioning

confidence: 99%

“…In a recent paper, the preparation of MFI-type zeolite pellets was described [8]. The pelletization apparatus is divided into two parts: a manual hydraulic press (Atlas 15T Manual Hydraulic Press, Specac) and a pellet die where the powder is incorporated.…”

Section: Methodsmentioning

confidence: 99%

“…At very low concentration, zeolites are able to trap water and volatile organic compounds thanks to their great adsorption abilities [3]. The French Space Agency (CNES) studied zeolites for the adsorption of volatile organic compounds in satellites [4–8]. …”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the mechanical resistance (compression tests) is either low (between 1 and 10 MPa) or the amount of binder is very high (more than 20 wt %) [20–25]. In our previous work, a hydraulic press was used to make zeolite pellets with very good mechanical resistance (about 100 MPa) and with a very small amount of methylcellulose or sodium metasilicate as binder (5 wt %) [8]. Because vibrations or impact upon satellites launch could cause the destruction of these bodies and contaminate on-board equipment, improved mechanical performance of zeolite materials is highly sought after.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Prediction of the mechanical properties of zeolite pellets for aerospace molecular decontamination applications

Rioland¹,

Dutournié²,

Faye³

et al. 2016

Beilstein J. Nanotechnol.

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Zeolite pellets containing 5 wt % of binder (methylcellulose or sodium metasilicate) were formed with a hydraulic press. This paper describes a mathematical model to predict the mechanical properties (uniaxial and diametric compression) of these pellets for arbitrary dimensions (height and diameter) using a design of experiments (DOE) methodology. A second-degree polynomial equation including interactions was used to approximate the experimental results. This leads to an empirical model for the estimation of the mechanical properties of zeolite pellets with 5 wt % of binder. The model was verified by additional experimental tests including pellets of different dimensions created with different applied pressures. The optimum dimensions were found to be a diameter of 10–23 mm, a height of 1–3.5 mm and an applied pressure higher than 200 MPa. These pellets are promising for technological uses in molecular decontamination for aerospace-based applications.

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Dioxin and 1,2-dichlorobenzene adsorption in aluminosilicate zeolite Beta

et al. 2016

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International audienceThe influence of sodium cations content in zeolite Beta crystals of different sizes (between 200 nm and 2 μm) on the adsorption of pollutants (dioxin and polychlorobenzene) is investigated. In this study, protons which balance the negative charge of the zeolitic framework are partially replaced by sodium cations. Chemical, structural and textural analyses performed on the exchanged crystals indicate that the exchange rates reached 75–80 % and that the structure of zeolites is preserved. Adsorptions of pollutants in zeolite Beta samples were successfully carried out using 1,2-dichlorobenzene (gas phase) and 2,3-DiChloroDibenzo-p-Dioxin: 2,3-DCDD (liquid phase) but reveal different behaviors. Indeed, all samples adsorb the same amount (around 7 molecules) of 1,2-dichlorobenzene per unit-cell of zeolite, whereas the dioxin adsorption amounts increase with the amount of sodium cations. Compared to their protonic forms, the dioxin adsorption capacities were multiplied by a factor of 1.3 for the sodium exchanged small crystals (size between 200 nm and 1 μm) and by a factor of 4 for the sodium exchanged microcrystals (size between 1 and 2 μm) for an equilibrium concentration of 2,3-DCDD of 0.5 mmol/L in both cases

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A new generation of MFI-type zeolite pellets with very high mechanical performance for space decontamination

Cited by 24 publications

References 36 publications

Guar gum: A novel binder for ceramic extrusion

Guar gum: A novel binder for ceramic extrusion

Prediction of the mechanical properties of zeolite pellets for aerospace molecular decontamination applications

Dioxin and 1,2-dichlorobenzene adsorption in aluminosilicate zeolite Beta

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