Development of a hydrogen mordenite sorbent for the capture of krypton from used nuclear fuel reprocessing off-gas streams

Greenhalgh, Mitchell; Garn, Troy G.; Law, Jack D.

doi:10.1080/00223131.2014.877404

Cited by 6 publications

(10 citation statements)

References 4 publications

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“…Thus, the goal of the current work was to assess a method of making the chalcogels more mechanically stable for I 2 (g) by imbedding them in polyacrylonitrile [PAN, (C 3 H 3 N) n ], a porous polymer, at different loadings using a process recently developed for other sorbents like hydrogen mordenite and MOFs. − Then, the various PAN-chalcogel hybrid sorbents were used to study the relationship of chalcogel loadings in the sorbents to I 2 (g) capture efficiency and their adsorption behaviors were evaluated in dynamic (dilute) and static (concentrated) iodine conditions. Furthermore, thermal analysis and X-ray diffraction (XRD) were used to evaluate the nature of the iodine binding in these materials.…”

Section: Introductionmentioning

confidence: 99%

Polyacrylonitrile-Chalcogel Hybrid Sorbents for Radioiodine Capture

Riley

Pierce

Chun

et al. 2014

Environ. Sci. Technol.

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Powders of a Sn2S3 chalcogen-based aerogel (chalcogel) were combined with powdered polyacrylonitrile (PAN) in different mass ratios (SnS33, SnS50, and SnS70; # = mass% of chalcogel), dissolved in dimethyl sulfoxide, and added dropwise to deionized water to form pellets of a porous PAN-chalcogel hybrid material. These pellets, along with pure powdered (SnSp) and granular (SnSg) forms of the chalcogel, were then used to capture iodine gas under both dynamic (dilute) and static (concentrated) conditions. Both SnSp and SnSg chalcogels showed very high iodine loadings at 67.2 and 68.3 mass%, respectively. The SnS50 hybrid sorbent demonstrated a high, although slightly reduced, maximum iodine loading (53.5 mass%) with greatly improved mechanical rigidity. In all cases, X-ray diffraction results showed the formation of crystalline SnI4 and SnI4(S8)2, revealing that the iodine binding in these materials is mainly due to a chemisorption process, although a small amount of physisorption was observed.

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Section: Introductionmentioning

confidence: 99%

Polyacrylonitrile-Chalcogel Hybrid Sorbents for Radioiodine Capture

Riley

Pierce

Chun

et al. 2014

Environ. Sci. Technol.

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“…An AgZ-PAN composite sorbent was prepared from this powder as previously described for hydrogen form material (HZ-PAN) [14]. The BET surface area of this AgZ-PAN sorbent was measured to be only 81.9 m 2 /g.…”

Section: Sorbent Preparation and Discussionmentioning

confidence: 99%

“…The heated slurry was allowed to mix until the PAN had completely dissolved and a homogenous mixture was obtained. NaZ-PAN sorbent particles were formed in the same manner as previously described [14]. The sorbent particles were filtered away from the excess water/DMSO and allowed to dry overnight in a vacuum oven at 333 K. The particles were then contacted for 24 hours with a 0.1 M AgNO 3 solution at 368 K under very mild agitation using an argon gas sparge technique to facilitate Ag/Na exchange.…”

Section: Sorbent Preparation and Discussionmentioning

confidence: 99%

“…Gas effluent samples from the cryostat were continuously injected into an Agilent Technologies model 7890A gas chromatograph (GC) utilizing a Supelco carboxen 1010 plot fused silica capillary column with a thermal conductivity detector to monitor Xe/Kr concentrations to complete breakthrough. The Xe and Kr capacities of the AgZ-PAN were calculated in the same manner as described in the previous reference [14].…”

Section: Xe/kr Capacity Determinationmentioning

confidence: 99%

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Development and evaluation of a silver mordenite composite sorbent for the partitioning of xenon from krypton in gas compositions

Garn

Greenhalgh

Law

2015

Journal of Nuclear Science and Technology

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A new engineered form composite sorbent for the selective separation of xenon from krypton in simulant composition off-gas streams resulting from the reprocessing of used nuclear fuel has been developed and evaluated. A sodium mordenite powder was incorporated into a macroporous polymer binder, formed into spherical beads and successfully converted to a 9 wt.% silver form composite sorbent. The final engineered form sorbent retained the characteristic surface area indicative of sodium mordenite powder. The sorbent was evaluated for xenon adsorption potential with capacities measured as high as 30 millimoles of xenon per kilogram of sorbent achieved at ambient temperature and 460 millimoles of xenon per kilogram sorbent at 220 K. Xenon/krypton selectivity was calculated to be 22.4 with a 1020 µL/L xenon, 150 µL/L krypton in a balance of air feed gas at 220 K. Adsorption/desorption thermal cycling effects were evaluated with results indicating sorbent performance was not significantly impacted while undergoing numerous adsorption/desorption thermal cycles.

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“…of hydrogen activated mordenite (H-mordenite), a zeolitic sorbent shown to have a high capacity for krypton [32]. H-mordenite exhibited quite a good capacity for krypton when sorption was performed with a 150 ppm krypton stream balanced with helium of 8.40 mg g -1 , but capacity dropped by two orders of magnitude when the stream was modified to include 79% nitrogen to about one half the capacity of 10 wt% C@ETS-10 under similar conditions.…”

Section: Effect Of Temperature On Sorption Of I 2 and Krmentioning

confidence: 99%

Adsorption of radioactive iodine and krypton from off-gas stream using continuous flow adsorption column

Nandanwar

Coldsnow

Porter

et al. 2017

Chemical Engineering Journal

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A novel Engelhard titanosilicate -10 (ETS-10) supported 10 wt% hollow carbon nanopolyhedron (10 wt% C@ETS-10) sorbent developed in our laboratory was investigated for adsorption of the radioactive iodine and krypton from off-gas stream using a continuous flow adsorption column. Adsorption experiments were performed to determine the capacity of 10 wt% C@ETS-10 sorbent for iodine and krypton in multicomponent mixture system by varying operating parameters, such as inlet concentration of iodine (I 2 ) and krypton (Kr), and adsorption column temperature. Pristine and used sorbents were characterized by scanning electron microscopy-energy dispersion spectroscopy (SEM-EDS), X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy to identify the morphology, elemental and vibration analysis of the sorbent before and after the experiments. EDS and XPS spectra of the used samples clearly indicate the presence of iodine on the sorbent. Multicomponent sorption capacities of I 2 and Kr of 10 wt% C@ETS-10 sorbent calculated from the breakthrough curves at 20°C at 25 ppm I 2 and 70 ppm Kr balanced with nitrogen were found to be 41.5 and 0.0323 mg g -1 , respectively.2 Sorption data was found to be best fitted by the Langmuir as well as Freundlich isotherm model. Experimental data were analyzed by Thomas, Yoon-Nelson, and Bohart-Adams sorption kinetics models to predict the breakthrough curves and calculate the characteristic parameters of the column that are useful for process design for the multicomponent system. Results show that 10 wt% C@ETS-10 sorbent has potential sorbent for adsorption of multicomponent (I 2 and Kr) from off-gas stream.

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Development of a hydrogen mordenite sorbent for the capture of krypton from used nuclear fuel reprocessing off-gas streams

Cited by 6 publications

References 4 publications

Polyacrylonitrile-Chalcogel Hybrid Sorbents for Radioiodine Capture

Polyacrylonitrile-Chalcogel Hybrid Sorbents for Radioiodine Capture

Development and evaluation of a silver mordenite composite sorbent for the partitioning of xenon from krypton in gas compositions

Adsorption of radioactive iodine and krypton from off-gas stream using continuous flow adsorption column

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