Comparison of H2Adsorption, O2Adsorption, H2Titration, and O2Titration on Supported Palladium Catalysts

Autor:	G. Leofanti, G. Prelazzi, M. Cerboni
Rok vydání:	1999
Předmět:	Hydrogen Inorganic chemistry chemistry.chemical_element Catalysis Metal Preparation method Adsorption chemistry visual_art visual_art.visual_art_medium Physical chemistry Physical and Theoretical Chemistry Dispersion (chemistry) Stoichiometry Palladium
Zdroj:	Journal of Catalysis. 181:73-79
ISSN:	0021-9517
DOI:	10.1006/jcat.1998.2271
Popis:	Four different methods for Pd dispersion measurement are compared: H2adsorption, O2adsorption, H2titration, and O2titration. A correct comparison requires the knowledge of H/Pdsand O/Pdsstoichiometries. The H/Pdsstoichiometry is discussed by reviewing published results, which lead us to the conclusion that H/Pds=1. Our experimental results demonstrate that the relative O/H stoichiometry is independent of Pd concentration, type of carrier, and preparation method, O/H=1; thus O/Pds=1. If correctly performed, the four methods give the same Pd dispersion, but those based on direct adsorption have less applicability, because they require the complete removal of hydrogen used for reduction from the metal surface. A method to evaluate residual hydrogen is given.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::c708b6e76f66658502d9efc35b2c1f8a https://doi.org/10.1006/jcat.1998.2271 Zobrazit plný text záznamu Full Text from ScienceDirect