Temperature-programmed desoprtion of H2 from the surfaces of pd/support and Pd-Ag/support catalysts (support = Al2O3, SiO2) |
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Authors: | Izabela Witoska Stanisaw Karski Magdalena Frajtak Natasza Krawczyk and Aleksandra Królak |
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Institution: | (1) Institute of General and Ecological Chemistry, Technical University of Lodz, ul. Zeromskiego 116, 90-924 Lodz, Poland |
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Abstract: | Thermal desorption of H2 from the surface of Pd/support and Pd-Ag/support (support = Al2O3, SiO2) catalysts has been investigated. Two wide desorption peaks can be observed for the 5% Pd/support catalyst. The presence
of these peaks in the thermogram indicates that several adsorption states exist, which is the result of occurrance of different
adsorption centers of specific bond strengths for hydrogen. The addition of silver to the palladium catalysts causes a considerable
decrease in the size of the high temperature desorption peak. It is also worth noting that the temperature of the maximum
of the desorption rate remains practically constant for all bimetallic catalysts studied. This means that the activation energy
of the hydrogen desorption process does not change after the introduction of silver to the palladium catalyst. |
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Keywords: | Supported palladium catalysts bimetallic Pd-Ag/support catalysts nitrate reduction |
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