CATALYTIC EXCHANGE OF METHANE AND DEUTERIUM ON PLATINUM, RUTHENIUM, AND PLATINUM-RUTHENIUM ALLOYS

Journal Article · Sun Mar 01 04:00:00 EST 1964 · Journal of Physical Chemistry (U.S.)

DOI:https://doi.org/10.1021/j100785a008· OSTI ID:4068247

McKee, D W; Norton, F J

The exchange reaction between methane and deuterium was studied in the temperature range 70 to 200 deg C on unsupported platinum, ruthenium, and platinum- ruthenium alloy catalysts. Platinum-rich catalysts were found to be the most active and the order of initial appearance of the deuteriomethanes was CH/sub 3/D > CH/sub 2/D/sub 3/ > CHD/sub 3/ > CD/sub 4/. Ruthenium-rich alloys gave CD/sub 4/ as the most abundant initial product and the rates of formation of the different species were initially CD/sub 4/ > CH/sub 3/D > CHD/sub 3/ > CH/sub 2/D/sub 2/. In all cases, the rates of the exchange reaction were approximately first order in methane pressure and negative order in deuterium pressure. In addition, the concentration of chemisorbed hydrogen on the metal surface during the exchange reaction was followed by simultaneous measurements of the rate of formation of HD. The results indicate that the reaction takes place by different mechanisms with the two metals. With platinum, the dominant mechanism is stepwise exchange, whereas multiple exchange processes are more important in the case of ruthenium. (auth)

• Research Organization: General Electric Research Lab., Schenectady, N.Y.
• Sponsoring Organization: USDOE
• NSA Number: NSA-18-016034
• OSTI ID: 4068247
• Journal Information: Journal of Physical Chemistry (U.S.), Journal Name: Journal of Physical Chemistry (U.S.) Vol. Vol: 68; ISSN JPCHA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ADSORPTION
CATALYSIS
CHEMICAL REACTIONS
CHEMISTRY
DEUTERIUM
DEUTERIUM COMPOUNDS
DIAGRAMS
EFFICIENCY
ENRICHMENT
GASES
HIGH TEMPERATURE
HYDROGEN
IODINE
ISOTOPIC EXCHANGE
MEASURED VALUES
METALS
METHANE
METHYL RADICALS
ORGANIC IODINE COMPOUNDS
PLATINUM
PLATINUM ALLOYS
QUANTITY RATIO
REACTION KINETICS
RUTHENIUM
RUTHENIUM ALLOYS
SURFACES
TABLES
TEMPERATURE
TRACE AMOUNTS