Document Details

Document Type : Article In Journal 
Document Title :
Redox properties of supported copper catalysts studied in liquid and gas phase by in situ ATR-IR and XAS
Redox properties of supported copper catalysts studied in liquid and gas phase by in situ ATR-IR and XAS
 
Subject : Chemistry 
Document Language : English 
Abstract : The redox behavior of copper-based catalysts plays a prominent role in several important chemical processes. So far relatively little is known about how this behavior is affected by the medium (liquid or gas phase) in which the copper particles are immersed. In this study, we have investigated the redox properties of copper nanoparticles supported on Al2O3, TiO2 and SiO2 in the liquid (presence of solvent) and gas phase by means of in situ Attenuated Total Reflection Infrared spectroscopy (ATR-IR) and in situ X-ray absorption spectroscopy (XAS) in combination with CO adsorption. Using CO and H2 as a reducing agent, the presence of the solvent was found to facilitate reduction of the copper constituent at lower temperatures than in the gas phase. Furthermore, the nature of the support strongly affected the extent of the reduction of the copper constituent. Copper was spontaneously reduced in the presence of CO-saturated solvent to an extent increasing in the order Cu/SiO2 < Cu/Al2O3 < Cu/TiO2. In the gas phase, reduction of the copper constituent in Cu/Al2O3 was more difficult than that in Cu/SiO 2. The reduction behavior measured in the presence of the solvent was found to be correlated to the activity of the catalysts in the anaerobic oxidation of 3-octanol. 
ISSN : 0920-5861 
Journal Name : Catalysis Today 
Volume : 178 
Issue Number : 1 
Publishing Year : 1432 AH
2011 AD 
Article Type : Article 
Added Date : Tuesday, February 28, 2012 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
Cecilia MondelliMondelli, Cecilia ResearcherDoctorate 
Davide FerriFerri, Davide ResearcherDoctorate 
Jan-Dierk GrunwaldtGrunwaldt, Jan-Dierk ResearcherDoctorate 
Nicoletta RavasioRavasio, Nicoletta ResearcherDoctorate 
Alfons BaikerBaiker, Alfons ResearcherDoctorate 

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