The determination of dispersity and metal content of supported palladium catalysts with redox titration

Szabó, S.; Nagy, Ferenc; Gyimesi, J.

doi:10.1016/s0926-860x(02)00369-1

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Effect Of the Hydrochloric Acid Concentration On The Efficie1

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2009

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“…When Pd catalyst is stored in the atmosphere, its surface is covered with adsorbed oxygen. The unusual dissolution of Pd in hydrochloric acid in the absence of AlCl 3 is attributed to the oxidizing effect of the adsorbed oxygen that is formed on the Pd surface as follows [38] Further, Pd present as a thin metallic layer on the support pellets with a large surface area that favors its attack by hydrochloric acid.…”

Section: Effect Of the Hydrochloric Acid Concentration On The Efficiementioning

confidence: 99%

Hydrometallurgical Recovery of Nano-Palladium from Spent Catalyst

Barakat¹,

El-Mahdy²,

Hegazy³

et al. 2009

TOMPJ

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Hydrometallurgical recovery of nano-palladium (Pd) from spent Pd/Al 2 O 3 catalyst has been investigated. The Pd content in the spent catalyst sample was assayed to be 0.42% while the remainder was mainly aluminum oxide. Mixture of HCl and AlCl 3 was studied as leaching agent for the sample. The Pd was deposited with formic acid. Different parameters affecting leaching and deposition processes such as, time, temperature, liquid/solid ratio, were investigated. Phase of spent catalyst were identified by X-ray diffraction (XRD) analysis. The deposited Pd was characterized by scanning electron microscope (SEM), transmission electron microscope (TEM) and energy dispersive X-ray (EDX) for identification of the grain size and composition. The deposited palladium was found to be in the nano-size range (34.5-70.5 nm).

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Section: Effect Of the Hydrochloric Acid Concentration On The Efficiementioning

confidence: 99%