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Article

Effect of Chlorine-Containing VOCs on Silver Migration and Sintering in ZSM-5 Used in a TSA Process

1
Commissariat à l’Energie Atomique et aux Energies Alternatives (CEA), DAM, DIF, F-91297 Arpajon CEDEX, France
2
LIPhy, Université Grenoble Alpes, UMR 5588 CNRS, 38058 Grenoble CEDEX 9, 140 rue de la physique, France
3
MATEIS, University Lyon, INSA-Lyon, Université Claude Bernard Lyon I, UMR5510 CNRS, F-69621 Villeurbanne CEDEX, France
4
IRCELYON, University Lyon, Université Claude Bernard Lyon I, UMR 5256 CNRS, F-69626 Villeurbanne CEDEX, France
*
Authors to whom correspondence should be addressed.
Catalysts 2019, 9(8), 686; https://doi.org/10.3390/catal9080686
Received: 25 July 2019 / Revised: 8 August 2019 / Accepted: 10 August 2019 / Published: 14 August 2019
(This article belongs to the Special Issue Synthesis and Application of Zeolite Catalysts)
Silver nanoparticles are currently one of the most studied nanostructured nanomaterials. Because nanoparticle size and dispersion act together in determining a material’s physical and chemical properties, there is a continuous quest to develop size-controlled synthesis methods. Nonetheless, the instability of the nanometer-sized particles, which is caused by their tendency to aggregate irreversibly into larger particles, remains a recurrent problem. The use of confining scaffolds, such as the regular system of cages in a crystalline zeolite-type material, is often reported in the literature as an efficient solution to overcome particle migration at the surface. Silver nanoparticles encapsulated in ZSM-5 ([email protected]) represent a new generation of adsorbent for Xe enrichment from the atmosphere that is currently being developed at the pilot scale in a Temperature Swing Adsorption (TSA) process. In this study, we have found that the presence of Cl-containing compounds in the air (VOCs) leads to a poisoning of the active silver phase by the formation of silver chloride. By a careful study of process parameters, we have found that most of the chlorine can be removed by heat treatment above 573 K so that the adsorption properties of silver are regenerated. That said, when applying 573 K temperature regeneration at the pilot scale, we observe a very minor but observable decay of xenon adsorption capacity that continues cycle after cycle. The mechanism of capacity decay is discussed in terms of (i) the residual presence of Cl at the surface of silver nanoparticles, (ii) the aggregation of silver nanoparticles into larger particles (sintering mechanism), and (iii) the acceleration of silver particle migration to the surface and sintering. View Full-Text
Keywords: zeolite; silver nanoparticles; sintering; poisoning; adsorption zeolite; silver nanoparticles; sintering; poisoning; adsorption
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MDPI and ACS Style

Monpezat, A.; Couchaux, G.; Thomas, V.; Artheix, A.; Deliere, L.; Gréau, C.; Topin, S.; Coasne, B.; Roiban, L.; Cardenas, L.; Farrusseng, D. Effect of Chlorine-Containing VOCs on Silver Migration and Sintering in ZSM-5 Used in a TSA Process. Catalysts 2019, 9, 686. https://doi.org/10.3390/catal9080686

AMA Style

Monpezat A, Couchaux G, Thomas V, Artheix A, Deliere L, Gréau C, Topin S, Coasne B, Roiban L, Cardenas L, Farrusseng D. Effect of Chlorine-Containing VOCs on Silver Migration and Sintering in ZSM-5 Used in a TSA Process. Catalysts. 2019; 9(8):686. https://doi.org/10.3390/catal9080686

Chicago/Turabian Style

Monpezat, Arnaud, Gabriel Couchaux, Vincent Thomas, Antoine Artheix, Ludovic Deliere, Claire Gréau, Sylvain Topin, Benoit Coasne, Lucian Roiban, Luis Cardenas, and David Farrusseng. 2019. "Effect of Chlorine-Containing VOCs on Silver Migration and Sintering in ZSM-5 Used in a TSA Process" Catalysts 9, no. 8: 686. https://doi.org/10.3390/catal9080686

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