Abstract

The noble metals Pd, Rh, and Ru that are present in the Hanford high-level waste will be processed into a melter feed for vitrification and permanent disposal. The treatment of waste slurry with HCOOH, a step in producing a melter feed, results in the production of H{sub 2} and NH{sub 3} due to the catalytic activity of the noble metals. The presence of H{sub 2} and NH{sub 3} could lead to hazardous conditions in a treatment facility. This study determined the relationship between noble metals concentration and H{sub 2} and NH{sub 3} production for application in future pilot-scale studies and prediction of catalytic activity for a waste with known noble metals concentration. Hydrogen production increased as noble metals concentration increased until a saturation level was reached. Ammonia production increased with noble metal concentration. Due to the limited number of tests, these relationships require confirmation.

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