Capture of Elemental and Organic Iodine from Dilute Gas Streams by Silver-exchanged Mordenite

Bruffey, Stephanie H.; Jubin, Robert Thomas; Jordan, Jacob A.

doi:10.1016/j.proche.2016.10.041

Cited by 44 publications

(37 citation statements)

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“…[163][164][165][166][167][168] In the particular case of the capture of iodine species, the adsorption properties and cation exchange capacities of zeolites make them interesting and remarkable candidates for this application. In the literature, several zeolites of different structural types have been studied for the capture of iodine species, such as mordenite (MOR structural type), 29,34,74,76,77,79,80,[169][170][171][172][173][174][175][176][177][178] NaX and NaY zeolites (FAU type), 5,60,75,77,78,88,132,179 ZSM-5 (MFI type), 74,77 ferrierite (FER type) and zeolite beta (*BEA type) 74,77 (ESI, Table 3 †).…”

Section: Ag-exchanged Zeolitesmentioning

confidence: 99%

“…Later, numerous studies were carried out on this topic, especially during the 1970s and 1980s 21,29,34,38,40,47,52,180 and then between 2000 and 2017. 5,8,71,[74][75][76][77][78][79][80][169][170][171][173][174][175][176][177][184][185][186][187][188] These studies focused on the determination of the inuence of various parameters such as the temperature ( C), silver content (wt%), Si/Al ratio, supercial velocity, and pretreatment of the material on the adsorption capacities of silver-exchanged zeolites (ESI, Table 3 †). Other works focused on issues such as aging of the material under different atmospheres (NO x , humidity).…”

Section: Ag-exchanged Zeolitesmentioning

confidence: 99%

“…Studies for a long time mainly focused on zeolites of the FAU and MOR structural types. 5,8,29,31,34,38,40,47,52,71,[169][170][171]173,175,177,178,182,184,185,187,188 The interest in these two types of zeolites can be explained by their large pore openings, which allow easier diffusion of iodine (I 2 , CH 3 I) and non-iodine (NO x , CO x , H 2 O, etc.) compounds inside the zeolites.…”

Section: Inuence Of Different Parameters On the Capture Performance mentioning

confidence: 99%

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Porous sorbents for the capture of radioactive iodine compounds: a review

et al. 2018

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Section: Ag-exchanged Zeolitesmentioning

confidence: 99%

Section: Ag-exchanged Zeolitesmentioning

confidence: 99%

Section: Inuence Of Different Parameters On the Capture Performance mentioning

confidence: 99%

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Porous sorbents for the capture of radioactive iodine compounds: a review

et al. 2018

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“…The absence of relationships between the physico-chemical properties of these sorbents and their adsorption performances precluded a detailed understanding of the phenomena involved in sorption processes. Experimental reports could be found on the effect of the cation type in the case of I 2 capture [2][3][4] but no screening studies exist for CH 3 I. Owing to the differences existing in the chemical structures of I 2 and CH 3 I, methyl iodide is always less easily adsorbed in comparison with molecular iodine [17]. For metal-exchanged zeolites, this stems probably from the higher activation energy needed to dissociate the C-I bond compared with the I-I bond, the latter almost proceeding without any activation barrier [18].…”

Section: Introductionmentioning

confidence: 99%

Effects of the cation and Si/Al ratio on CH3I adsorption by faujasite zeolites

Azambre

Chebbi

Hijazi

2020

Chemical Engineering Journal

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In this study, we aimed to investigate the effects of some specific zeolitic parameters on the retention properties of metal-exchanged faujasites (X and Y) for methyl iodide. In the first part, the nature of exchangeable cation (H + , Na + , Cu + /Cu 2+ , Ag + , Pb 2+) is discussed. In order to link the materials properties with the adsorption behaviour, the state and location of the exchanged transition metals after calcination at 500°C were first investigated using N 2 sorptiometry at 77K, DRS-UV-Vis spectroscopy, XRD and FTIR of adsorbed CO and NO. Adsorption capacities at breakthrough and saturation were obtained from CH 3 I breakthrough curves obtained at 100°C, this temperature being relevant to severe nuclear accident conditions. From the I/M ratio computed at saturation of the adsorbents by CH 3 I vapors, it was found that the efficiency of iodine trapping follows the order Cu + /Cu 2+ > Ag + >> Pb 2+ > Na + > H +. This efficiency roughly followed the trend of the different cations to form stable MI x precipitates from CH 3 I. Nevertheless, for nuclear application, it was found that Ag/FAU are preferred over Cu/FAU, due to the propension of the latter to oxidize CH 3 I to I 2 , which slips out of the sorbent bed at 100°C. The effect of the preparation method (ion-exchange vs impregnation) is then discussed for Ag/Y zeolites having different Si/Al ratio (2.5 and 40) but similar silver content (23 wt%). It is found that the silver oxidation state and silver dispersion have important effects on CH 3 I adsorption/desorption.

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“…Studies have been completed on the adsorption of iodides (both elemental and organic) onto silver mordenite (AgZ) from prototypical VOG streams (Jubin et al 2015;Bruffey et al 2016). AgZ has long been considered for use as an iodine sorbent in UNF reprocessing plants, but recent efforts have identified silver-functionalized silica-aerogel (AgAerogel) as a potential alternative iodine sorbent.…”

mentioning

confidence: 99%