Leaching kinetics of platinum and palladium from spent automotive catalysts

Conference · Thu Jan 01 00:00:00 EST 1987 · Sep. Sci. Technol.; (United States)

OSTI ID:6372240

Tyson, D R; Bautista, R G

Empirical rate expressions for both platinum and palladium were obtained from mass balances and concentration-time data in a packed bed reactor using different (HCl):(HNO3) leaching solution concentration ratios. The spent catalysts used in this study (-60 + 70 mesh to -120 + 140 mesh) were analyzed to be 3791 ppm platinum and 1306 ppm palladium. High initial rates for both platinum and palladium were obtained for the early stages of leaching and were followed by rapid decay up to about 110 minutes and 50 minutes respectively. Typical concentrations in the leached solution were about 40 ppm Pt and 20 ppm Pd after about 5 hours for the experimental conditions used. The extent of reaction for platinum was in the 90 percent range while that of the palladium was in the 70 percent range.

• Research Organization: Iowa State Univ., Ames
• OSTI ID: 6372240
• Report Number(s): CONF-851011-
• Journal Information: Sep. Sci. Technol.; (United States), Vol. 22:2/3; Conference: 4. symposium on separation science and technology for energy applications, Knoxville, TN, USA, 20 Oct 1985
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CATALYSTS
LEACHING
PACKED BED
PERFORMANCE
PALLADIUM
MATERIALS RECOVERY
PLATINUM
CATALYTIC CONVERTERS
CHEMICAL REACTION KINETICS
EXPERIMENTAL DATA
QUANTITY RATIO
TIME DEPENDENCE
DATA
DISSOLUTION
ELEMENTS
EQUIPMENT
INFORMATION
KINETICS
MANAGEMENT
METALS
NUMERICAL DATA
PLATINUM METALS
POLLUTION CONTROL EQUIPMENT
PROCESSING
REACTION KINETICS
RECOVERY
SEPARATION PROCESSES
TRANSITION ELEMENTS
WASTE MANAGEMENT
WASTE PROCESSING
400105* - Separation Procedures