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Study of supported palladium catalysis variously heat treated in hydrogen using microactivity testing, transmission electron microscopy, X-ray analysis and the extended X-ray absorption fine structure technique
Study of supported palladium catalysis variously heat treated in hydrogen using microactivity testing, transmission electron microscopy, X-ray analysis and the extended X-ray absorption fine structure technique
- Source :
- Surface and Coatings Technology. 28:347-357
- Publication Year :
- 1986
- Publisher :
- Elsevier BV, 1986.
-
Abstract
- Real regenerated supported palladium (0.5wt.%Pd-LiAl5O8) catalysts used in the hydrogenation of alkenes or alkynes and alkadienes were sintered at high temperatures (300, 500 or 600 °C) in a hydrogen atmosphere, and subjected to alternative treatments in either reducing and/or oxidizing atmospheres. X-ray diffraction analysis indicated hydride formation in the reducing stage, with intermediate compositions ranging between α-PdH and β-PdH, while on using the extended X-ray absorption fine structure technique palladium oxide was observed in catalysts subjected to oxidizing conditions. The statistics of the palladium-crystallite size distributions, as obtained by transmission electron microscopy, showed evidence of sintering and/or redispersion (splitting), as a result of the alternative reducing or oxidizing treatments. The catalytic activity in the alkadiene hydrogenation reaction is influenced by the treatment sequence applied to the regenerated catalysts.
- Subjects :
- chemistry.chemical_classification
Materials science
Hydrogen
Extended X-ray absorption fine structure
Alkene
Hydride
Inorganic chemistry
chemistry.chemical_element
Surfaces and Interfaces
General Chemistry
Condensed Matter Physics
Surfaces, Coatings and Films
Catalysis
chemistry.chemical_compound
chemistry
Alkadiene
Oxidizing agent
Materials Chemistry
Palladium
Subjects
Details
- ISSN :
- 02578972
- Volume :
- 28
- Database :
- OpenAIRE
- Journal :
- Surface and Coatings Technology
- Accession number :
- edsair.doi...........f70e2de4ba812102cb0ef8b293a80b91
- Full Text :
- https://doi.org/10.1016/0257-8972(86)90091-5