Adsorption of Noble Gases on Silver-mordenite

Munakata, Kenzo; Kanjo, Seigo; Yamatsuki, Satoshi; Koga, Akihiro; Ianovski, Dmitri

doi:10.1080/18811248.2003.9715408

Cited by 58 publications

(17 citation statements)

References 5 publications

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“…Statistical analysis of the TEM images indicates that the nanoparticle distribution is centered around 3(AE 0.8) nm with as pecific surface area of about 60 m 2 g À1 .X ANES/EXAFSa nalysis indicates that silver in nanoparticles are in metallicf orm (Ag 0 ). Previous work has considered silver-exchanged molecular sieves for argon,o xygen, and nitrogen adsorption [25] but not xenon.A sf ar as xenon is concerned, af ew works have focused on regular and silver-doped molecular sieves but without considering separation, purification processes [26][27][28] or very low temperatures. [29] Pure component adsorption isotherms…”

Section: Resultsmentioning

confidence: 99%

Breakthrough in Xenon Capture and Purification Using Adsorbent‐Supported Silver Nanoparticles

Deliere

Coasne

Topin

et al. 2016

Chemistry A European J

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Rare gas capture and purification is a major challenge for energy, environment, and health applications. Of utmost importance for the nuclear industry, novel separation processes for Xe are urgently needed for spent nuclear fuel reprocessing and nuclear activity monitoring. The recovered, non-radioactive Xe is also of high economic value for lighting, surgical anesthetic, etc. Here, using adsorption and breakthrough experiments and statistical mechanics molecular simulation, we show the outstanding performance of zeolite-supported silver nanoparticles to capture/separate Xe at low concentrations (0.087-100 ppm). We also establish the efficiency of temperature swing adsorption based on such adsorbents for Xe separation from Kr/Xe mixtures and air streams corresponding to off-gases generated by nuclear reprocessing. This study paves the way for the development of novel, cost-efficient technologies relying on the large selectivity/capacity of adsorbent-supported silver nanoparticles which surpass all materials ever tested.

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Section: Resultsmentioning

confidence: 99%

Breakthrough in Xenon Capture and Purification Using Adsorbent‐Supported Silver Nanoparticles

Deliere

Coasne

Topin

et al. 2016

Chemistry A European J

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Section: Specific Surface Areamentioning

confidence: 99%

“…The decrease in specific surface areas of AgM can be attributed to partial blocking of the channels in the presence of Ag + cations. Munakata 55 showed that ionic exchange with silver nitrate of mordenite decreased the specific surface area from 217 to 109 m 2 g −1 . On the other hand, the acid treatment of natural mordenite increased the specific surface area, micropore volume, micropore area, and Si/Al ratio as shown as Tables 1 and 5.…”

Section: Specific Surface Areamentioning

confidence: 99%

Influence of acid and heavy metal cation exchange treatments on methane adsorption properties of mordenite

Sakizci

Tanrıverdi²

2015

Turk J Chem

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Abstract:In this study, the adsorption of methane (CH 4) capacities onto natural mordenite obtained fromİzmir, Turkey, and its cationic forms (CuM, AgM, FeM, and HM samples) were investigated at the temperatures of 0 and 25• C up to 100 kPa. Natural and modified samples were characterized by X-ray diffraction (XRD), X-ray fluorescence (XRF),Fourier transform infrared (FT-IR), thermogravimetry (TG-DTG), differential thermal analysis (DTA), scanning electron microscopy (SEM) coupled with energy dispersion spectroscopy (EDS), and N 2 adsorption methods. Quantitative XRD analysis showed that the major component of the natural zeolite was mordenite, together with minor amounts of quartz, feldspar, and clay mineral. The specific surface area and microporosity of the mordenite sample decreased notably after Ag cation exchange treatment. It was found that the adsorption capacity and the affinity of CH 4 with mordenite samples depended mainly on the type of exchanged cations and increased as HM < FeM < CuM < M < AgM for 25• C. The uptake of methane increased as HM < FeM < CuM < AgM < M for 0 • C. Capacity of mordenites for CH 4 ranged from 0.237 mmol g −1 to 0.528 mmol g −1 .

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“…The Kr capacity of AgZ at ambient temperatures was on the order of 1 mmol/kg and is 10 to 15 times greater than that of HZ. Munakata et al (2003) have also examined the use of AgZ and HZ to recover Xe and Kr from a simulated DOG stream. They point out that this approach should have lower operating costs than cryogenic distillation and avoids the possible fire hazard resulting from the accumulation of ozone in the cryogenic systems.…”

Section: Solid Sorbent Separation Processesmentioning

confidence: 99%

Assessments and Options for Removal and Immobilization of Volatile Radionuclides from the Processing of Used Nuclear Fuel

Jubin

Strachan

2015

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Nuclear fuel reprocessing is being considered in the US as part of an effort to help meet the nation's energy needs. Various options are available to meet these needs (DOE 2010). The recent Fuel Options Study indicated that fuel cycles that utilize continuous recycling are among the "most promising" (Wigeland et al. 2014). After the valuable components have been extracted from the irradiated UO 2 during reprocessing, the remaining waste must be immobilized and sent to a repository. Some of the radionuclides in the fuel are short-lived isotopes that decay to innocuous levels soon after reactor discharge, e.g., 127 Xe (t 1/2 = 36.4 d). However, the preponderance of radionuclides requires long-term, geological storage. In this report, we assess options for capturing and immobilizing radionuclides expected to volatilize during aqueous reprocessing of used nuclear fuel. This document is an update to a previous report prepared in 2011 that was only released as a draft (FCR&D-SWF-2011-000305). Several radionuclides that require intermediate-to long-term storage become volatile during the processing of the fuel. These include 3 H, 14 C, 85 Kr, and 129 I. These radionuclides are released into the gas streams associated with processing the nuclear fuel and are particularly difficult to remove because of their chemical state and very low concentrations. The SCALE code version 6.0 (ORNL 2009) was used to calculate the masses and activities of these volatile radionuclides in representative used commercial light water reactor (LWR) fuels that could be reprocessed for recycling. Two levels of fuel burnup, 30 GWd/tIHM (gigawatt-days per metric ton initial heavy metal) and 60 GWd/tIHM with 5-and 30-year cooling periods (time out of reactor) were selected as reference cases for the these SCALE calculations. A number of the capture methods are reviewed in this study. Although many appear promising, significant research and development remains to be completed to advance them from the laboratory or bench scale to a level suitable for use in commercial facilities. Likewise, significant development and performance testing is needed for waste forms, particularly for iodine. Assessments and Options for Removal and Immobilization of Volatile Radionuclides from the Processing of Used Nuclear Fuel iv 3/31/15 ACKNOWLEDGMENTS The primary authors of this report wish to acknowledge the many researchers at the DOE national laboratories who are part of the Off-Gas Sigma Team and who have contributed information in support of his study. This includes S.

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Adsorption of Noble Gases on Silver-mordenite

Cited by 58 publications

References 5 publications

Breakthrough in Xenon Capture and Purification Using Adsorbent‐Supported Silver Nanoparticles

Breakthrough in Xenon Capture and Purification Using Adsorbent‐Supported Silver Nanoparticles

Influence of acid and heavy metal cation exchange treatments on methane adsorption properties of mordenite

Assessments and Options for Removal and Immobilization of Volatile Radionuclides from the Processing of Used Nuclear Fuel

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