Iron-induced deactivation of Raney and supported nickel methanation catalysts. Annual progress report, September 15, 1978-September 15, 1980

Technical Report · Mon Oct 01 04:00:00 EDT 1979

DOI:https://doi.org/10.2172/6997222· OSTI ID:6997222

Dumesic, J. A.

It was concluded that: (1) the decreasing activity of Ni catalyst for methanation is caused by both catalyst sintering and surface sites blocking, probably by carbon deposition; and (2) the increases in particle size are mainly attributed to the formation and subsequent decomposition of Ni(CO)/sub 4/. The local overheating contributes, if any, only minor portions to the observed catalyst sintering. In the extreme cases, such a process can cause massive metal transportation down the catalyst bed. In view of the thermodynamics of carbon deposition via Boudouard reaction and formation of Ni(CO)/sub 4/, the operating temperatures for future kinetic studies should be kept higher than, say, 523 K. Also, the CO exposure times will be kept as short as possible to avoid complication induced by Ni(CO)/sub 4/. The equipment for high pressure Moessbauer spectroscopy will be ready to go in the near future.

• Research Organization: Wisconsin Univ., Madison (USA). Dept. of Chemical Engineering
• DOE Contract Number: FG21-78ET12248
• OSTI ID: 6997222
• Report Number(s): DOE/ET/12248-T1
• Country of Publication: United States
• Language: English

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47 OTHER INSTRUMENTATION
CARBON
CARBONYLS
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL REACTIONS
CHEMISORPTION
COAL GASIFICATION
DEACTIVATION
DEPOSITION
ELEMENTS
FABRICATION
GAMMA SPECTROMETERS
GASIFICATION
IRON COMPOUNDS
MEASURING INSTRUMENTS
METALS
METHANATION
MOESSBAUER EFFECT
MOESSBAUER SPECTROMETERS
NICKEL
NICKEL COMPOUNDS
NONMETALS
OXYGEN
SEPARATION PROCESSES
SINTERING
SORPTION
SPECTROMETERS
THERMOCHEMICAL PROCESSES
THERMODYNAMICS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS