Materials
The Ag0Z used for this study was prepared by reducing the commercial AgZ (IONEX-Type, Ag-900 E16, Molecular Products) in a 4% H2/Ar gas stream at 400 oC for 24 hours.11 These reduction conditions were the optimal conditions to maximize iodine loading capacity on the Ag0Z which were obtained from previous studies.11, 13 Detailed physical properties of Ag0Z were described previously9; the same material was used herein. Various gases used in this study, including compressed dry air (Ultra Zero Grade, dew point < -70 oC), N2 (Ultra High Purity), and 4% H2/Ar (Certified Standard Grade, 4% H2 balanced in Ar), were purchased from Airgas Inc.