Treatment of Off-Gas Emissions: Kinetics of Silver Mordenite Catalyzed Methyl Iodide Decomposition

Goettsche, Heinrik; Raja, Krishnan S.; Sabharwall, Piyush; Utgikar, Vivek

doi:10.1016/j.ceja.2022.100290

Cited by 6 publications

(8 citation statements)

References 14 publications

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“…The work presented followed the same process as the dry conditions experiment that was previously published with the exception of the water evaporator [15]. Aged sorbent testing was conducted by allowing sorbents in various silver loadings and reduction states to age in laboratory conditions for 1 month while monitoring temperature and humidity.…”

Section: Methodsmentioning

confidence: 99%

“…The water evaporator operation is described in Section 2.1.1. Complete details are available in the previous publication [15].…”

Section: Experimental Apparatusmentioning

confidence: 99%

“…The only exception to this is in the aged sorbent test described in Section 2.7 in which a single sorbent sample was reduced prior to the aging process and was not reduced again prior to dynamic adsorption testing. Complete details of the sorbent preparation process are available in the previous publication [15].…”

Section: Sorbent Preparationmentioning

confidence: 99%

“…1 can perform 3 simultaneous tests allowing for a single sodium mordenite sorbent and two silver mordenite sorbents to be tested simultaneously. The moisture experiment was carried out under similar conditions to the original dry experiment [15]. The addition of the water evaporator demonstrated an average absolute humidity of 8.3 g water /kg dry air .…”

Section: Dynamic Adsorption Testmentioning

confidence: 99%

“…The data taken was analyzed using the integral method as described in a previous publication to determine the reaction rate constant [15].…”

Section: Post Saturation Kinetic Studymentioning

confidence: 99%

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Effects of moisture and aging upon decomposition of methyl iodide by reduced silver mordenite

Goettsche,

Raja,

Sabbarwall

et al. 2024

Adsorption

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Reduced silver mordenite has been considered as a sorbent for the capture of organic iodides, especially methyl iodide, from off-gases produced by aqueous used nuclear fuel reprocessing operations. The adsorption capacity of this material has been unpredictable especially when NOx and water are present. Previous work has found that a catalytic decomposition reaction is occurring on the surface but few determinations have been made of the kinetics of this reaction. The work presented tested the adsorption behavior and apparent catalytic reaction rate in humid conditions and compared those to dry conditions testing. Both experiments observed a first order reaction with rate constants of 0.0847 L/g sorbent/s and 0.1202 L/g sorbent/s respectively. Such a reduction in apparent rate constant is possibly due to either water obstructing methyl iodide adsorption or product desorption limitation. Changes in the adsorption profile were also apparent between these two, with the humid conditions experiment reaching saturation sooner than the dry conditions experiment. Additionally, an experiment into the effects of sorbent storage in a controlled laboratory environment was performed. The performance of the sorbent materials that were stored with silver in the zerovalent state was slightly inferior to those materials that were stored in ionic form (Ag+) and reduced to zerovalent silver immediately prior to subjecting them to sorption test. The materials stored with silver in the ionic form (and reduced just prior to application) behaved essentially similarly to the freshly synthesized (and reduced) sorbents in the sorption tests. This suggests that zerovalent silver experiences some oxidation resulting in deactivation of some sites.

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Section: Methodsmentioning

confidence: 99%

“…The water evaporator operation is described in Section 2.1.1. Complete details are available in the previous publication [15].…”

Section: Experimental Apparatusmentioning

confidence: 99%

Section: Sorbent Preparationmentioning

confidence: 99%

Section: Dynamic Adsorption Testmentioning

confidence: 99%

“…The data taken was analyzed using the integral method as described in a previous publication to determine the reaction rate constant [15].…”

Section: Post Saturation Kinetic Studymentioning