Preparation, hydrothermal stability and thermal adsorption storage properties of binderless zeolite beads

This paper presents two different reactor concepts, an external and integrated reactor, for thermochemical energy stores which are operating in an open process using ambient air for the heat and mass transport. In the external reactor concept the material charging and discharging is performed in a reactor separated from the material store whereas in the integrated reactor concept the charging and discharging take place directly in the material store itself. For both reactor concepts, the heat and mass transfer inside the reactor or the material store respectively, have been analyzed in detail by means of numerical simulations. Based on the theoretical investigations a reactor design and an operation strategy have been developed. At laboratory scale an external test reactor (approx. 20 l of storage volume) has been built and experimentally tested. The experiments have proven the concept of the developed reactor design. A high thermal performance during the charging and discharging process of the thermochemical energy store has been obtained.

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“…The zeolite is commercially available and characterized by a fast reaction kinetic and a high water uptake [13,14].…”

Section: Theoretical Base and Processes For Thermochemical Energy Stomentioning

confidence: 99%

Experimental and Numerical Investigations of Different Reactor Concepts for Thermochemical Energy Storage

2014

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“…For CH 4 ( Figure 3a) the Virial plot shows a close agreement between experimental data and the Langmuir model predictions typical of Type I isotherms with a linear representation of data with a positive slope. However, again experimental data presents an inflection in such a plot for adsorbed amounts lower than 0.1 mol/kg, but in this case without a single tendency since the representation ln(p/q) versus q deviates from linear by decreasing at 363 K and increasing at 305 K. Another possible explanation for the uncommon data behavior observed at low coverage for CH 4 and N 2 , is that we studied binderless beads of 5A zeolite in which the nonzeolitic components (temporary binder) were converted to zeolite matter during a hydrothermal conversion during the beading procedure, 26,27 giving rise to some heterogeneity to the 5A zeolite/CH 4 /N 2 system resulting in the observed discrepancies at very low coverage (or low partial pressure).…”

Section: Resultsmentioning

confidence: 92%

“…Recently, a technology was applied where the nonzeolitic components (temporary binder) are converted to zeolite matter during a hydrothermal conversion during the beading procedure. 26,27 The resulting binderless beads can increase in this way the working capacities of existing molecular sieve zeolite adsorbent technologies and therefore increase the productivity of equilibrium driven adsorption processes. Zeolites are very cheap and robust materials among others 28−34 and, in equilibrium driven processes when the ratio of the selectivities between components to be separated is based in ratio of the adsorbed amount at equilibrium, can also be an alternative to kinetically driven-based adsorption separations.…”

Section: Introductionmentioning

confidence: 99%

Adsorption Equilibrium and Dynamics of Fixed Bed Adsorption of CH₄/N₂ in Binderless Beads of 5A Zeolite

Silva

Ferreira

Mendes

et al. 2015

Ind. Eng. Chem. Res.

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The sorption equilibrium of methane (CH 4 ) and nitrogen (N 2 ) in binderless beads of 5A zeolite is presented between 305 and 373 K and pressures up to 3 bar in a static electronic microbalance. The adsorbed amount of CH 4 and N 2 is around 1.6 and 1.02 mol/kg ads , respectively, at 305 K and 3 bar. A comparison of these values with the ones in literature shows that the adsorption capacity of the 5A binderless beads is 20% higher than that of the 5A binder commercial materials. The CH 4 and N 2 adsorption isotherms were fitted with the simplest Langmuir model with a prediction of the maximum amount adsorbed for both compounds of 5.0 mol/kg. The heats of sorption are −16.6 and −15.1 kJ/mol for CH 4 and N 2 , respectively. In the overall pressure and temperature range the isotherms of N 2 seems practically linear. However, it was observed that the experimental data of N 2 at low coverage (below 0.2 bar) deviates slightly from Type I isotherms. Thereafter, the binary sorption of CH 4 and N 2 has been investigated in a fixed bed adsorber at 313 and 343 K and total pressures up to 5 bar for 50(CH 4 )/ 50(N 2 ) and 75(CH 4 )//25(N 2 ) mixture ratios diluted in an inert helium stream. A mathematical model was formulated to compute the dynamic behavior of the fixed bed adsorber using the extended binary Langmuir model, showing close agreement with the measured binary breakthrough experiments in the partial pressure range of the components above 0.2 and below 3 bar.

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“…die Abhängigkeit der hydrothermalen Beständigkeit bzw. der notwendigen Desorptionstemperatur bei Zeolithen vom Typ X und Y von deren Zusammensetzung, speziell vom Aluminiumgehalt . Weiterhin sind es typische Partikeleigenschaften, wie Größe, Größenverteilung und Struktur sowie chemische Eigenschaften der Oberfläche der einzelnen Zeolithkristalle, durch die sowohl die adsorptiven als auch die mechanischen Eigenschaften zeolithischer Molekularsiebe beeinflusst werden.…”

Section: Zeolithpulversyntheseunclassified

Manufacturing of Industrial Zeolite Molecular Sieves

Gleichmann

Unger

Brandt

2017

Chemie Ingenieur Technik

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Manufacturing of Industrial Zeolite Molecular SievesSince more than 60 years zeolite molecular sieves are mainly used in industrial processes as high efficient adsorbents in purification or separation processes in gas or liquid phase. As response to the different requirements in the final application different manufacturing processes were developed. In this review the impact of synthesis and/or shaping processes onto the properties of hydrophilic, zeolite molecular sieves with regard to their industrial use are demonstrated and explained on special examples. Thereby zeolite powder, as well as shaped binder-containing and binderless material is considered.

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Preparation, hydrothermal stability and thermal adsorption storage properties of binderless zeolite beads

Cited by 46 publications

References 7 publications

Experimental and Numerical Investigations of Different Reactor Concepts for Thermochemical Energy Storage

Experimental and Numerical Investigations of Different Reactor Concepts for Thermochemical Energy Storage

Adsorption Equilibrium and Dynamics of Fixed Bed Adsorption of CH₄/N₂ in Binderless Beads of 5A Zeolite

Manufacturing of Industrial Zeolite Molecular Sieves

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Preparation, hydrothermal stability and thermal adsorption storage properties of binderless zeolite beads

Cited by 46 publications

References 7 publications

Experimental and Numerical Investigations of Different Reactor Concepts for Thermochemical Energy Storage

Experimental and Numerical Investigations of Different Reactor Concepts for Thermochemical Energy Storage

Adsorption Equilibrium and Dynamics of Fixed Bed Adsorption of CH4/N2 in Binderless Beads of 5A Zeolite

Manufacturing of Industrial Zeolite Molecular Sieves

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Product

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Adsorption Equilibrium and Dynamics of Fixed Bed Adsorption of CH₄/N₂ in Binderless Beads of 5A Zeolite