Methyl iodide sorption by reduced silver mordenite

Scheele, R.D.; Burger, L.L.; Matsuzaki, Carrie

doi:10.2172/6017408

Cited by 51 publications

(53 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The actual halogen reaction(s) with either ionic or metallic silver mordenite is largely uncharacterized and unknown (Chapman et al, 2010). Although calculated thermodynamic values indicate that the strongly oxidizing NO x could affect the chemistry of halogen sorption by Ag 0 Z by reacting with Ag 0 to produce silver oxide or silver nitrate, Thomas et al (1977), Burger and Scheele (1982) and Scheele et al (1983) report that nitrogen oxides did not have very significant effects on iodine sorption by Ag 0 Z. Although not determined to have a significant impact, we prepared our test silver mordenites with NO x in the treatment gas.…”

Section: Melter Offgas Compositionmentioning

confidence: 99%

“…To comply with the United States Environmental Protection Agency's (EPA) (US EPA, 2011) and Washington State Department of Ecology's (2011) air emission standards for radioiodine, the WTP design contractor selected reduced-silver mordenite (Ag 0 Z) to control releases of the long-lived 129 I (t 1/2 = 1.7 Â 10 7 a) high-level waste constituent based on recommendations, studies, and reviews by Burger and Scheele (1983), Scheele and Burger (1987), Scheele et al (1983), and Scheele et al (1988).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Solidification and stabilization of silver mordenite used to control radioiodine emissions from Hanford’s Waste Treatment Plant

Scheele

Wend

2015

Annals of Nuclear Energy

View full text Add to dashboard Cite

Section: Melter Offgas Compositionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Solidification and stabilization of silver mordenite used to control radioiodine emissions from Hanford’s Waste Treatment Plant

Scheele

Wend

2015

Annals of Nuclear Energy

View full text Add to dashboard Cite

“…15) Mean free path of the molecule at 423 K can be estimated to be in the same order of the pore diameter, which implies that the diffusion behavior of iodine inside the pore can be described mainly by the molecular diffusion and Knudsen diffusion. 16) Applying the parallel pore model, the effective diffusion coefficient D ea can be related with those two diffusion coefficients by the following equation: where D ka , ε a and τ denote the Knudsen diffusion coefficient, the porosity of adsorbent and the tortuosity factor.…”

Section: Discussion On Parameters (1) Effective Diffusion Coefficientmentioning

confidence: 97%

A Simple Model Predicting Iodine Profile in a Packed Bed of Silica-Gel Impregnated with Silver Nitrate

Mineo

Gotoh

Iizuka

et al. 2002

Journal of Nuclear Science and Technology

View full text Add to dashboard Cite

Based on a simple adsorption theory, a mathematical model was proposed to predict axial iodine profiles of the column of silica gel impregnated with silver nitrate (hereinafter referred to as Ag-S) in an off-gas treatment system for spent fuel dissolution. The unknown parameters of the model: the effective diffusion coefficient D ea and the Langmuir coefficient K were determined by curve fitting of iodine profile experimentally obtained. At 423 K, D ea and K were found to be 5.60×10−7 m 2 ·s −1 and 1.0×10 5 m 3 ·kg −1 , respectively. Using the parameter values, the model could well predict the iodine profiles obtained at 423 K in the previous works under different experimental conditions. Furthermore, the effect of silver contents on the iodine profiles was reasonably predicted. It was suggested that the proposed model is simple and would be useful to predict the iodine profiles in Ag-S adsorbent columns.

show abstract

“…CH3I at ~300 ppm; NO, NO2 at 0, ~1,000, and ~20,000 ppm; H2O at 0.01% and 1.2%; used on-line GC/PID for measuring CH3I; starch to indicate I2 CH presence; measured iodine in sorbent using XRF. Iodine capacities measured up to 21.7 wt% (Scheele 1983). 3 I at 25-34 ppm; 500-800 ppm NO, NO2; 1.5-2% H2O; 2.…”

Section: Data Gap Analysismentioning

confidence: 99%