Effects of periodic operation in propane and propylene oxidation over noble metal catalysts

Conference · Mon Sep 01 04:00:00 EDT 1986 · Am. Chem. Soc., Div. Pet. Chem., Gen. Pap., Prepr.; (United States)

OSTI ID:6821878

Shinjoh, H; Muraki, H; Fujitani, Y

The authors investigated the behavior of automotive noble metal catalyst in cycled composition feedstreams, using engine exhaust gas and simulated exhaust gas of stoichiometric air fuel ratio. In both cases, they observed that under cycling conditions, the activity of noble metal catalysts, particularly Pt and Pd, is superior to the activity under static feed composition, and that the performance depends on the cycling period of the air fuel ratio. These findings may be applicable to improving the reactivity of three-way catalysts through selection of suitable cycling conditions. Although such an empirical approach could be useful, they believe that it is important to clarify the mechanism relating to the effects of periodic operation over noble metal catalysts. The purpose of the present study was to determine how noble metal catalysts perform under periodic feed-composition conditions, and why the activity of noble metal catalysts depend on the cycling period. They systematically investigated the simple reaction systems, e.g., CO-O/sub 2/ . CO-NO, H/sub 2/-NO, and other reactions, over noble metal catalysts. For example, the periodic operation effect was clearly observed in CO oxidation. the conversion depended on the cycling period, and the maximum conversion at a particular cycling period was determined. In the present work, they selected another binary gas reaction system, the oxidation of hydrocarbons (C/sub 3/H/sub 6/ and C/sub 3/H/sub 8/). Oxidation of propane and/or propylene is regarded as a model hydrocarbon (HC) oxidation for study of three-way catalysts.

• Research Organization: Toyota Central Research and Development Labs., Inc., 41-1, Aza Yokomichi Oaza Nagakute, Nagakute-cho, Aichi-gun, Aichi-ken, 480-11
• OSTI ID: 6821878
• Report Number(s): CONF-860911-
• Conference Information: Journal Name: Am. Chem. Soc., Div. Pet. Chem., Gen. Pap., Prepr.; (United States) Journal Volume: 31:3
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
33 ADVANCED PROPULSION SYSTEMS
330800 -- Emission Control-- Alternative Fuels
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ADDITIVES
AIR POLLUTION ABATEMENT
ALKALI METAL COMPOUNDS
ALKANES
ALKENES
AUTOMOTIVE FUELS
CATALYSTS
CATALYTIC EFFECTS
CESIUM COMPOUNDS
CESIUM OXIDES
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
ELEMENTS
EMISSION
EXHAUST GASES
FLUIDS
FUEL ADDITIVES
FUEL-AIR RATIO
FUELS
GASEOUS WASTES
GASES
HYDROCARBONS
KINETICS
MASS SPECTROSCOPY
METALS
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PALLADIUM
PERFORMANCE
PLATINUM
PLATINUM METALS
POLLUTION ABATEMENT
PROPANE
PROPYLENE
REACTION KINETICS
RHENIUM
SIMULATION
SPECTROSCOPY
TRANSITION ELEMENTS
VEHICLES
WASTES