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 (1993) RFA Text |  Recipients Lists
Research Category: Air Quality and Air Toxics , SBIR - Air Pollution , Small Business Innovation Research (SBIR)


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:

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

Progress and Final Reports:

  • Final