Mechanistic studies of the catalyzed carbon gasification reactions

Thesis/Dissertation · Sun Jan 01 04:00:00 EST 1989

OSTI ID:6859663

Goethel, P J

The catalyzed graphite hydrogenation reaction was studied employing the Etch Decoration Transmission Electron Microscope technique to view the monolayer channeling action of nickel and ruthenium catalysts. The results indicate a carbidic catalyst surface carbon reacting with surface hydrogen to form methane as the rate limiting step of the mechanism. The mechanism is compared to the methanation reaction from CO + H{sub 2} feedstocks and also to the catalytic growth of carbon filaments. A new mode of catalytic action termed tunneling was shown to exist for Pt, Ni, and Ru in the graphite hydrogenation reaction. For monolayer channeling and tunneling the overall contribution to bulk gasification is shown to be significant. A TGA technique for measuring the solubility and diffusion coefficient of carbon in metals is presented. The technique is shown to be accurate and to give quick results in comparison to other techniques. The monolayer channeling action of Pt, Cu, V{sub 2}O{sub 5}, V and Mo{sub 2}C was examined in the graphite oxidation reaction. Pt and Cu show C-C bond breakage as the rate limiting step while V, V{sub 2}O{sub 5} and Mo{sub 2}C reveal a gas-catalyst interface reaction limiting the process. V{sub 2}O{sub 5}, V and Mo{sub 2}C were also found to participate in monolayer edge recession thus forming elongated hexagon pits.

• Research Organization: State Univ. of New York, Buffalo, NY (USA)
• OSTI ID: 6859663
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404* -- Coal
Lignite
& Peat-- Gasification
010408 -- Coal
Lignite
& Peat-- C1 Processes-- (1987-)
ALKANES
CARBIDES
CARBON
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSIS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
COAL GASIFICATION
COMPARATIVE EVALUATIONS
COPPER
DIFFUSION
ELECTRON MICROSCOPY
ELEMENTAL MINERALS
ELEMENTS
GASIFICATION
GRAPHITE
GRAVIMETRIC ANALYSIS
HYDROCARBONS
HYDROGENATION
METALS
METHANATION
METHANE
MICROSCOPY
MINERALS
MOLYBDENUM CARBIDES
MOLYBDENUM COMPOUNDS
NICKEL
NONMETALS
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PLATINUM
PLATINUM METALS
QUANTITATIVE CHEMICAL ANALYSIS
REFRACTORY METAL COMPOUNDS
RUTHENIUM
SOLUBILITY
SURFACE PROPERTIES
SYNTHESIS
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
TRANSMISSION ELECTRON MICROSCOPY
VANADIUM
VANADIUM COMPOUNDS
VANADIUM OXIDES