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Recovery and separation of palladium from spent catalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
44623 46046 2006 5 PDF Available
Title
Recovery and separation of palladium from spent catalyst
Abstract

An efficient and complete separation of precious metals from the containing secondary materials has a vital economic impact. Palladium loaded on alumina support is usually used as a catalyst in fertilizers industry where the recovery of the metals from the spent catalyst is practically important. Palladium was partially dissolved from the spent catalyst in hot concentrated hydrochloric acid where a large amount of aluminum is also dissolved. The main objective of this work is to find out the optimum conditions for efficient and clean dissolution of palladium with minimum attack to the alumina carrier. Palladium can form different soluble chloro-complexes which can enhance the dissolution process if an oxidizing agent is added. A small amount of hydrogen peroxide could greatly improve the dissolution of palladium in dilute hydrochloric acid while the alumina support was left nearly unaffected. Complete dissolution of palladium was achieved by leaching with a solution contains 7% HCl and 5% H2O2 at 60 °C for 2 h with a liquid/solid ratio of 10/1. The leach liquor contained 0.04% palladium and 0.5% aluminum and the filtered solids was a pure aluminum rich residue. Palladium could be separated from the leach liquor by reduction with formic acid solution. Heating the solution increased the efficiency of palladium reduction and also produced larger palladium particles those can be easily separated by filtration. Palladium powder of 98% purity was produced with recovery efficiency >99%.

Keywords
Palladium; Spent catalyst; Recovery; Separation
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Recovery and separation of palladium from spent catalyst
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 301, Issue 2, 24 February 2006, Pages 182–186
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us