Novel High Efficiency Catalytic Converter for Utility and Other Engines

EPA Contract Number: 68D30073
Title: Novel High Efficiency Catalytic Converter for Utility and Other Engines
Investigators: Pfefferle, William
Small Business: Precision Combustion, Inc.
EPA Contact: Manager, SBIR Program
Phase: II
Project Period: September 1, 1993 through August 1, 1996
Project Amount: $149,850
RFA: Small Business Innovation Research (SBIR) - Phase II (1993) Recipients Lists
Research Category: Air Quality and Air Toxics , SBIR - Air Pollution , Small Business Innovation Research (SBIR)


The thirteen million two- and four-stroke gasoline utility engines sold in the U.S. each year are a major source of total U.S. air emissions. The California Air Resources Board (CARB) has set emissions standards for these previously unregulated devices, and the U.S. Environmental Protection Agency is now considering setting such standards.

In Phase I, the advantageous performance of Precision Combustion, Inc.'s innovative low cost utility engine catalytic converter was demonstrated through prototype testing. The emissions of hydrocarbon and carbon monoxide from both the two-stroke and a four-stroke engine were reduced by 95-99%, to well below the CARB 1999 standards. NOx emissions were not reduced, but can be controlled by other means (e.g., richer operation, EGR). The necessary excess air addition and cooling were accomplished simply and integrally to the converter.

In Phase II, optimized, manufacturable prototypes will be developed for several test engines, and long term durability will be demonstrated.

Supplemental Keywords:

RFA, Scientific Discipline, Air, Toxics, Sustainable Industry/Business, air toxics, cleaner production/pollution prevention, Sustainable Environment, Chemistry, HAPS, VOCs, Technology for Sustainable Environment, mobile sources, Engineering, Engineering, Chemistry, & Physics, Nox, Nitrogen Oxides, engine exhaust, NOx reduction, air pollutants, control, hydrocarbon, nitrogren oxides (NOx), engines, air pollution control, novel catalyst systems, carbon monoxide (CO), air pollution, carbon monoxide, treatment, hydrocarbons, nitrogen oxides (Nox), air emissions, engine

Progress and Final Reports:

  • Final