Effects of Pd, Rh, and Ru concentration on HCOOH decomposition during the processing of NCAW waste simulant

摘要

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.