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Automotive sulfate emission data.

J H Somers

    Environmental Health Perspectives
    |April 1, 1975
    PubMed
    Summary

    Automotive catalyst cars emit significantly more sulfate than non-catalyst cars. Pelleted catalysts show lower initial sulfate emissions compared to monolith types, with emissions increasing at higher speeds.

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    Area of Science:

    • Environmental Science
    • Automotive Engineering
    • Air Pollution Control

    Background:

    • Automotive emissions are a significant source of air pollution.
    • Sulfate emissions from vehicles are a concern for environmental and health impacts.
    • Catalytic converters are used to reduce harmful emissions, but their effect on sulfate formation requires investigation.

    Purpose of the Study:

    • To determine and compare sulfate emission factors from vehicles with and without catalytic converters.
    • To evaluate differences in sulfate emissions between pelleted and monolith catalytic converter types.
    • To understand the influence of operating conditions on sulfate emissions.

    Main Methods:

    • Compilation and analysis of sulfate emission data from various research groups (EPA, GM, Ford, Chrysler, Esso).
    • Comparison of sulfate emissions under different test conditions, including low-speed and high-speed driving.
    • Examination of catalyst types (pelleted vs. monolith) and their impact on sulfate formation and release.

    Main Results:

    • Catalyst-equipped vehicles emit substantially higher quantities of sulfates compared to non-catalyst vehicles.
    • Pelleted catalysts demonstrate lower sulfate emissions during low-speed EPA Federal Test Procedures than monolith catalysts.
    • Sulfate emissions from pelleted catalysts increase at higher speeds due to the decomposition of stored sulfates.

    Conclusions:

    • Catalytic converters significantly increase automotive sulfate emissions.
    • Pelleted catalysts exhibit a sulfate storage mechanism, releasing emissions later at higher temperatures and speeds.
    • Further research is needed to fully understand sulfate storage and the impact of factors like air injection and catalyst location.

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