Analysis of temperature-programmed reduction profiles from metal-supported catalysts

Journal Article · Sun May 01 04:00:00 EDT 1988 · J. Catal.; (United States)

DOI:https://doi.org/10.1016/0021-9517(88)90065-6· OSTI ID:7031101

Huang, Y J; Xue, J; Schwarz, J A

An experimental procedure is proposed to enable analysis of H/sub 2/ emission/consumption data obtained during temperature-programmed reduction (TPR) of a metal-supported catalyst. Using the methods described allows one to account for chemical processes other than reduction and thus remove their contribution from the TPR profile. The resulting real TPR spectrum is a signature that reflects only reduction processes that occur under nonisothermal conditions. To demonstrate the methodology, Pt, Ir, and Pt/Ir supported on alumina have been characterized. The real TPR profile of the bimetallic catalyst is not the simple superposition of the reduction spectra of the monometallics. This observation has generally been considered indicative of some type of alloy-phase formation. On the other hand, had the hydrogen emission/consumption data been used directly, the same conclusion would be tenuous.

• Research Organization: Syracuse Univ., NY (USA)
• OSTI ID: 7031101
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 111:1; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
BIMETALS
CATALYST SUPPORTS
CATALYSTS
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
CHEMISORPTION
ELEMENTS
HYDROGEN
IRIDIUM
MEASURING METHODS
METALS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PLATINUM
PLATINUM METALS
REDUCTION
SEPARATION PROCESSES
SORPTION
SURFACE PROPERTIES
TEMPERATURE DEPENDENCE
TRANSITION ELEMENTS