Sintering of alumina-supported nickel and nickel bimetallic methanation catalysts in H/sub 2//H/sub 2/O atmospheres

Journal Article · Sat Jan 01 04:00:00 EST 1983 · J. Catal.; (United States)

OSTI ID:6293846

Bartholomew, C H; Pannell, R B; Fowler, R W

Sintering of ..cap alpha..-alumina- and nickel aluminate-supported nickel in H/sub 2/ and H/sub 2/O/H/sub 2/ atmospheres and alumina-supported Ni-Rh and Ni-Ru in H/sub 2/ was studied at temperatures between 773 and 1023 K. Total catalyst surface areas and metal surface areas were measured as a function of sintering time by argon BET and H/sub 2/ chemisorption, respectively. Phase compositions of the support and metal were investigated by x ray, while transmission electron microscopy, x-ray line broadening, and H/sub 2/ chemisorption were used to monitor changes in metal crystallite growth during heat treatments. The results indicate that significant losses in metal surface area occur as a result of (i) support collapse and (ii) metal crystallite growth in all of the catalysts. Nickel is most thermally stable on NiAl/sub 2/O/sub 4/ and more thermally stable on ..gamma..-Al/sub 2/O/sub 3/ than on ..cap alpha..-Al/sub 2/O/sub 3/ (below 1023 K). Rhodium and ruthenium additives enhance the thermal stability of nickel on alumina. Differential activity tests indicate that no significant changes in specific methanation activity occur for alumina-supported nickel catalysts as a result of sintering, although Ni-Rh and Ni-Ru catalysts produce a higher fraction of C/sub 2+/ hydrocarbons after heat treatment.

• Research Organization: Brigham Young Univ., Provo, UT
• OSTI ID: 6293846
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 79:1; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404* -- Coal
Lignite
& Peat-- Gasification
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ALLOYS
ALUMINATES
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
BIMETALS
CALCINATION
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISORPTION
COMPARATIVE EVALUATIONS
CRYSTAL GROWTH
DECOMPOSITION
ELECTRON MICROSCOPY
ELEMENTS
FABRICATION
HYDROGEN
HYDROGEN COMPOUNDS
METALS
METHANATION
MICROSCOPY
NICKEL
NICKEL ALLOYS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PLATINUM METAL ALLOYS
PYROLYSIS
RHODIUM ALLOYS
RUTHENIUM ALLOYS
SEPARATION PROCESSES
SINTERING
SORPTION
SPECTROSCOPY
SURFACE AREA
SURFACE PROPERTIES
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENTS
TRANSMISSION ELECTRON MICROSCOPY
VERY HIGH TEMPERATURE
WATER
X-RAY SPECTROSCOPY