Reducing Diesel NOx and Soot Emissions Via Particle-Free Exhaust Gas Recirculation

EPA Contract Number: 68D30118
Title: Reducing Diesel NOx and Soot Emissions Via Particle-Free Exhaust Gas Recirculation
Investigators: Roberts, Daryl L.
Small Business: CeraMem Corporation
EPA Contact: Manager, SBIR Program
Phase: I
Project Period: September 1, 1993 through March 1, 1994
Project Amount: $50,000
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)


Diesel engines play an important role in the United States economy for power generation and transportation. However, NOx and soot emissions from both stationary and mobile diesel engines are a major contributor to air pollution. Many engine modifications and exhaust-after-treatment devices have been proposed and tested to reduce the NOx and soot emissions form diesel exhausts. Simple techniques for NOx control such as exhaust gas recirculation (EGR) and injection timing retard increase soot formation. The control of soot formation is possible with diesel particulate filters (DPF's) with intermittent thermal oxidation of carbon soot. However, such filters have limitations associated with filtration efficiency and durability.

In this program, a novel diesel emissions control system will be developed. The system will utilize a high-efficiency ceramic filter to filter the exhaust gas. The filter will generate a particulate free exhaust gas, a portion of which will be used in EGR for NOx emissions reduction. The ceramic filter will be regenerated by backpulsing with quick pulses of compressed air. In Phase I, a prototype filter/EGR system will be tested with exhaust from a 35 Kw diesel source and operated for up to one year.

Supplemental Keywords:

Scientific Discipline, Air, Toxics, Sustainable Industry/Business, particulate matter, air toxics, cleaner production/pollution prevention, Chemistry, HAPS, VOCs, Technology for Sustainable Environment, mobile sources, New/Innovative technologies, Engineering, Engineering, Chemistry, & Physics, Nitrogen Oxides, Nox, stationary sources, urban air toxics, particulates, air pollutants, control, diesel engines, emission control technologies, nitrogren oxides (NOx), filtration technology, pollution control technologies, particulate emissions, toxic emissions, air pollution control, emissions, air pollution, diesel exhaust, emission controls, treatment, pollutants, urban soot, toxic contaminants, diesel, diesel exhaust particles, ceramic-filter, nitrogen oxides (Nox), power generation , Volatile Organic Compounds (VOCs), exhaust gas, pollution prevention, exhaust gas recirculation (EGR), soot

Progress and Final Reports:

  • Final