Kinetic and infrared study of the effect of metal crystallite size and metal-support interactions on CO hydrogenation reactions: a third-year progress report

Technical Report · Tue Jan 01 04:00:00 EST 1980

DOI:https://doi.org/10.2172/5254045· OSTI ID:5254045

Vannice, M. A.

Platinum and palladium supported on four different oxide materials - SiO/sub 2/, Al/sub 2/O/sub 3/, SiO/sub 2/-Al/sub 2/O/sub 3/, and TiO/sub 2/ - have been studied in depth. Different preparative techniques were utilized to vary metal particle size and change the state of the metal. For example, Pt and Pd deposited on TiO/sub 2/ and reduced at low temperatures (175 to 200/sup 0/C) exhibit normal adsorption behavior, whereas these same catalysts reduced at a high temperature (500/sup 0/C) transform into an SMSI (Strong Metal-Support Interactions) state and chemisorption becomes greatly reduced. Both fresh and used samples were characterized by H/sub 2/, and CO chemisorption. In addition, O/sub 2/ chemisorption and the H/sub 2/-O/sub 2/ titration reaction were conducted on most fresh reduced Pt and Pd catalysts to further characterize their adsorption properties and to determine the agreement among these various chemisorption techniques. X-ray line broadening measurements were than conducted on all catalyst samples, and TEM was used to further characterize selected samples, especially the Ni catalysts. Metal loadings were determined by Neutron Activation Analysis. Tables 1 and 2 provide the chemisorption data on Pt and Pd catalysts respectively, and Tables 3 and 4 show the turnover frequencies (N) measured on Pt and Pd dispersed on various supports.

• Research Organization: Pennsylvania State Univ., University Park (USA). Dept. of Chemical Engineering
• Sponsoring Organization: USDOE
• DOE Contract Number: AS02-77ER04463
• OSTI ID: 5254045
• Report Number(s): DOE/ER/04463-T1
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404* -- Coal
Lignite
& Peat-- Gasification
ACTIVATION ANALYSIS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
CHEMISORPTION
COAL GASIFICATION
COMPARATIVE EVALUATIONS
CRYOGENIC FLUIDS
ELEMENTS
FLUIDS
GASIFICATION
HYDROGENATION
INFRARED SPECTRA
METALS
METHANATION
NICKEL
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PALLADIUM
PLATINUM
PLATINUM METALS
SEPARATION PROCESSES
SORPTION
SPECTRA
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENTS