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CO Emissions Reduction

Home Forums CatCracking FCC Process CO Emissions Reduction

This topic contains 1 reply, has 2 voices, and was last updated by  Anonymous 13 years, 4 months ago.

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  • #2987


    Has anyone used CO Oxidizing catalyst for reducing carbon monoxide emissions in FCC Flue Gas?  If so, please discuss concerns and issues and problem resolutions.

  • #5982


    CO combustion promoter have been used extensively for several decades now.

    Historically the CO combustion promoter has been Platinum (Pt) based.

    The rule of thumb is 1 ppm of Pt in the circulating inventory for continuous control.
    Also, the rule of thumb has been to maintain the delta temperature between the
    regenerator bed to the cyclone inlets at less than 35 to 40 deg F. However, that
    control strategy has changed somewhat over the last few years to “just keep
    the cyclones under 1400 deg F.”

    The problem or issue with utilizing Pt based CO combustion promoters has been
    a significant increase in NOx emissions.

    Therefore, there has been the development and utilization of a non-Pt based CO
    combustion promoter, usually Pallidium (Pd) based. The issue of increased
    NOx emissions has been retarded with the Pd based promoters.
    However, Pd based promoters have been more expensive and have been
    less effective (agressive) at controlling immediate high levels of after-burn.
    Pd CO combustion promoters have proven to be more effective as a
    long-term control modulator. Then the Pt based additive would be
    used/employed for “emergency” situations.

    Ken Peccatiello

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