Reactor trap to remove hydrocarbons from engine exhaust during cold start

Journal Article · Mon Aug 01 04:00:00 EDT 1994 · Environmental Science and Technology; (United States)

DOI:https://doi.org/10.1021/es00057a028· OSTI ID:7020616

Yang, B L; Kung, H H ^[1]

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1. Northwestern Univ., Evanston, IL (United States)

The concept and the performance of a device to remove hydrocarbons from engine exhaust during cold start were described. The device consisted of a hydrocarbon adsorbent and a metal oxide that could react with the hydrocarbon by oxidation to form carbon oxide and water. The metal oxide could then be regenerated later in the drive cycle by reaction with oxygen. Using a mixed oxide containing Cr, Co, Fe, and Al; ZSM-5 zeolite as the adsorbent; and propene, propane, or toluene as the hydrocarbon, the efficiency of hydrocarbon removal was measured in the laboratory during the 2 min when the unit was heated from room temperature at a rate of 150[degree]C/min. The efficiency was found to be suppressed by the presence of water vapor, but not affected by the presence of CO and CO[sub 2]. With a mixture of 10% H[sub 2]O, 2% CO, 0.6% O[sub 2], 2000 ppm hydrocarbon, and the balance helium, the efficiencies were 92, 78, and 57% for toluene, propene, and propane, respectively. A conceptual device to remove the hydrocarbon efficiently was described. 10 refs., 5 figs., 1 tab.

• OSTI ID: 7020616
• Journal Information: Environmental Science and Technology; (United States), Journal Name: Environmental Science and Technology; (United States) Vol. 28:8; ISSN ESTHAG; ISSN 0013-936X
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330704* -- Emission Control-- Hydrocarbons
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ADSORPTION
AIR POLLUTION CONTROL
ALKANES
ALKENES
ALKYLATED AROMATICS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
AROMATICS
AUTOMOBILES
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON MONOXIDE
CARBON OXIDES
CATALYSTS
CATALYTIC CONVERTERS
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMIUM COMPOUNDS
CHROMIUM OXIDES
COBALT COMPOUNDS
COBALT OXIDES
CONTROL
ELEMENTS
EQUIPMENT
EXHAUST GASES
FLUIDS
GASEOUS WASTES
GASES
HELIUM
HYDROCARBONS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
IRON COMPOUNDS
IRON OXIDES
MATERIALS
MINERALS
NONMETALS
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN
OXYGEN COMPOUNDS
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
PROPANE
PROPYLENE
RARE GASES
REMOVAL
SILICATE MINERALS
SORPTION
TOLUENE
TRANSITION ELEMENT COMPOUNDS
VAPORS
VEHICLES
WASTES
WATER VAPOR
ZEOLITES