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NOx Stripping from Spark Ignition Automotive Engine Exhaust

EPA Contract Number: 68D30131
Title: NOx Stripping from Spark Ignition Automotive Engine Exhaust
Investigators: Cole, Jerald A.
Small Business: Energy and Environmental Research Corporation (CA)
EPA Contact: Manager, SBIR Program
Phase: I
Project Period: September 1, 1993 through March 1, 1994
Project Amount: $49,970
RFA: Small Business Innovation Research (SBIR) - Phase I (1992)
Research Category: Air Quality and Air Toxics , SBIR - Air

Description:

Approximately half of automotive NOx is released in the initial minutes after startup, when the catalytic converter is cold, and is a significant source of acid rain. This project will determine the feasibility of reversibly adsorbing this "cold-Start NOx in a sorbent bed and subsequently releasing the NOx into a three-way catalytic converter to be reduced. This could reduce the environmental NOx burden in many urban areas by as much as 25%. It could also permit the use of "lean-start" engines, which have the added advantage of reducing CO and hydrocarbon emissions. This device would be similar in design to existing catalytic converters.

Phase I will address the technical questions needed to determine feasibility. These include determining the capacity of the sorbent, the temperature/partial pressure relationship (adsorption isotherms), the kinetics of NOx adsorption, thermal or chemical deactivation of the adsorbent, and any negative environmental effects. The experiments will be carried out in an isothermal packed bed reactor with on-line instrumental gas analysis. In demonstrating feasibility the Phase I effort will produce a model of sorbent behavior to allow design of a pilot-scale unit for development and evaluation in subsequent Phase II research.

Supplemental Keywords:

Toxics, Air, Sustainable Industry/Business, Scientific Discipline, RFA, Technology for Sustainable Environment, Engineering, Chemistry, & Physics, HAPS, air toxics, Chemistry, cleaner production/pollution prevention, New/Innovative technologies, VOCs, mobile sources, tropospheric ozone, automotive, automotive exhaust, nitrogen oxides (Nox), NOx stripping, catalyst composition, hydrocarbons, Volatile Organic Compounds (VOCs), catalysts, hydrocarbon, pollution control technologies, catalytic combustion, automotive emission controls, automobiles, carbon monoxide, emissions, Nox, vehicular, adsorbents, novel catalyst systems, nitrogren oxides (NOx), acid rain, air pollutants, pollutants, auto emissions, Nitrogen Oxides, catalyst formulations, motor vehicles, carbon monoxide (CO), air pollution, vehicular exhaust, air pollution control, automotive emissions, acid deposition, vehicle emissions, sorbents, catalytic oxidative adsorption, pollution prevention, air emissions, sorbent technology

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The perspectives, information and conclusions conveyed in research project abstracts, progress reports, final reports, journal abstracts and journal publications convey the viewpoints of the principal investigator and may not represent the views and policies of ORD and EPA. Conclusions drawn by the principal investigators have not been reviewed by the Agency.

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