Dry Scrubbing of SOx and NOx Over Lathanide-Oxygen-Sulfur Compounds

EPA Contract Number: 68D10102
Title: Dry Scrubbing of SOx and NOx Over Lathanide-Oxygen-Sulfur Compounds
Investigators: Jalan, Vinod
Small Business: ElectroChem Inc.
EPA Contact: Manager, SBIR Program
Phase: II
Project Period: September 1, 1991 through August 1, 1994
Project Amount: $150,000
RFA: Small Business Innovation Research (SBIR) - Phase II (1991) Recipients Lists
Research Category: Air Quality and Air Toxics , SBIR - Air Pollution , Small Business Innovation Research (SBIR)


Over the past decade, there has been a continuing effort by EPA, DOE, GRI, EPRI, and utility companies toward the development of an inexpensive and reliable method for the removal of SOx and NOx from combustion gases. Existing processes for the combined removal of SOx and NOx have not proven to be particularly effective in meeting cost objectives and current emission standards. Selective catalytic reductions for NOx removal are reaching current emission standards, but they are prohibitively expensive because of the high initial cost of the catalyst and its replacement.

In Phase I, cerium oxide doped with strontium oxide, calcium oxide, or lanthanum oxide were identified for potential use for the removal of SOx and NOx from offgases generated by the combustion of fuels in boilers, internal combustion engines, and from IGCC power plants. These compounds have demonstrated many advantages over the state-of-the-art sorbents, and the potential exists for further improvements. Phase I results also demonstrated that ce- rium sulfate is effective for the reduction of NOx using NH3 as a reductant.

The successful utilization of doped cerium oxide sorbent and cerium sulfate catalyst for combined removal of SOx and NOx generated by the combustion of fuels requires additional research and development aimed toward opti- mizing the process and demonstrating the durability of such sorbents.

Supplemental Keywords:

RFA, Scientific Discipline, Air, Toxics, Sustainable Industry/Business, air toxics, cleaner production/pollution prevention, Sustainable Environment, Chemistry, HAPS, Technology for Sustainable Environment, New/Innovative technologies, Engineering, Engineering, Chemistry, & Physics, Nitrogen Oxides, Nox, sulfur oxides, lanthanide catalysts, air pollutants, control, selective catalytic reduction, combustion gas streams, nitrogren oxides (NOx), acid rain precursors, novel catalyst systems, dry scrubber, air pollution control, sorbent technology, Sox, air pollution, catalysts, internal combustion power plant, sorbents, combustion technology, combustion, nitrogen oxides (Nox), air pollutant precursors, air emissions, catalytic combustion, acid rain, boilers , removal, Sulfur Oxides (SO2), catalytic reduction

Progress and Final Reports:

  • Final