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• W2012014059 abstract "Long lasting impregnation (t > 50 h) of γ-alumina with PdCl42- at 50 °C was investigated in an acid pH range (3.5−5) by using a dialysis membrane reactor. Three types of simultaneous processes were analyzed: (I) alumina dissolution, (II) proton consumption, and (III) adsorption density of PdCl42- on the surface of alumina. It was observed that some amount of support was mobilized in the liquid phase during impregnation. The amount of dissolved alumina depends on the pH of the solution as well as on the nature of the impregnating ion (PdCl42-). The rates of alumina dissolution were 0.0603 μmol m-2 h-1 at pH 3.5 and 0.0177 μmol m-2 h-1 at pH 4. At pH 5, the presence of Al3+ in solution could not be detected. It is demonstrated that the protons are consumed in two distinct processes: (I) reversible adsorption of H+ (Langmuir-type adsorption) and (II) irreversible adsorption of H+ (leading to dissolution of alumina). A clear distinction between the reversible and irreversible adsorbed protons has not been made by now. Both reversible as well irreversible adsorbed protons were determined quantitatively. The amounts of reversible adsorbed protons at equilibrium were 4.05 μmol m-2 at pH 3.5, 3.3 μmol m-2 at pH 4, and 1.0 μmol m-2 at pH 5. It was observed that the rate of alumina dissolution at pH 3.5 is depressed by PdCl42- (the rate decreased from 0.0603 to 0.0353 μmol m-2 h-1) whereas at pH 4 such phenomena could not be evidenced. However, PdCl42- is not involved in the mechanism of alumina dissolution. It is proved that the adsorption of PdCl42- is blocking the neighboring sites for proton adsorption. The same amount of PdCl42- (around 0.68 μmol m-2) was found to be adsorbed on alumina at pH 3.5 and 4. It is likely that the high rate of alumina dissolution at pH 3.5 is an important factor for retarding the adsorption of PdCl42- on alumina. The experimental results suggest that always aluminum ions, originating from support, will be present in the catalytic active phase (i.e., palladium) and this may affect to some extent further catalytic behavior of impregnated material." @default.
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• W2012014059 date "2001-02-10" @default.
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• W2012014059 title "Alumina Dissolution during Impregnation with PdCl₄^2- in the Acid pH Range" @default.
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• W2012014059 doi "https://doi.org/10.1021/cm000693i" @default.
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