Ultra fast microwave-assisted leaching for recovery of platinum from spent catalyst

摘要

The platinum/rhenium bimetallic catalyst is widely used in reforming process for the production of high octane fuels. This spent catalyst contains 0.2 percent Pt, 0.43 percent Re and other impurities. This work has investigated two alternative methods for leaching spent catalyst sample. In the first method the sample was refluxed with aqua regia at a liquid/solid ratio of 5 for 2.5 h. In the second case, microwave radiation was used at a power of 150 W with aqua regia at a liquid/solid ratio of 2 for 5 min. After leaching, the platinum was separated from rhenium and recovered as diammonium hexachloroplatinate with recoveries of 96.5 percent and 98.3 percent. Rhenium was recovered as potassium perrehenate by recovery of 94.2 percent and 98.9 percent, respectively in these methods.