An Improved NOXSO Sorbent for the Removal of NOx and SOx from Flue Gas

EPA Contract Number: 68D60041
Title: An Improved NOXSO Sorbent for the Removal of NOx and SOx from Flue Gas
Investigators: Copeland, Robert
Small Business: TDA Research Inc.
EPA Contact: Manager, SBIR Program
Phase: I
Project Period: September 1, 1996 through March 1, 1997
Project Amount: $70,000
RFA: Small Business Innovation Research (SBIR) - Phase I (1996) RFA Text |  Recipients Lists
Research Category: Air Quality and Air Toxics , SBIR - Air Pollution , Small Business Innovation Research (SBIR)


Coal fired power plants are well developed and efficient but have high emissions of NOx and SOx. Current expendable sorbents are effective but incur significant costs for the purchase of the expendable sorbent and the disposal of spent sorbent. Therefore, a regenerable sorbent is needed to remove the SOx and NOx produced by combustion of the coal. A process known as NOXSO, which uses a regenerable sodium aluminate (NaAlO2) sorbent for the simultaneous removal of both NOx and SOx, is being commercialized under the Department of Energy Clean Coal Technology program. Although NaAlO2 can theoretically hold >39% SO2 (wt.), the current NOXSO sorbent suffers from a low SO2 loading (2.5% SO2 by weight). The low loading results in a very high sorbent circulation rate, which in turn causes a high parasitic power consumption (4% of the total electrical generation). In addition, because of the low sulfur loading the sorbent is cycled very frequently, resulting in high attrition losses and operating costs.

TDA Research, Inc. has identified a new method which should increase the sorbent loading without reducing the sorbent's life. They originally developed the sorbent production method for use with a different type of sorbent (tin oxide and zinc oxide for coal gasificationapplications). The methods will be used to produce an improved NOXSO sorbent with a high SO2 loading. By reducing the sorbent circulation rate, they should simultaneously reduce parasitic power and capital cost, and increase the effective life of the sorbent. The purpose of this project is to show the feasability of this concept.

Supplemental Keywords:

small business, SBIR, air emissions, engineering, chemistry, regeneration., RFA, Scientific Discipline, Air, Toxics, Waste, air toxics, Environmental Chemistry, Chemistry, HAPS, Atmospheric Sciences, Incineration/Combustion, Engineering, Chemistry, & Physics, Environmental Engineering, ambient air quality, Nitrogen Oxides, sulfur oxides, combustion byproducts, air pollutants, emission control technologies, hazardous air pollutants, industrial technology, air pollution, emission controls, emissions, ambient emissions, sorbent technology, industrial air pollution, sorbents, NOxSO process , combustion technology, combustion, incineration, sulfer oxide, coal fired power plants, coal combustion, emissions contol engineering, regeneration, power generation , atmospheric chemistry, combustion contaminants, Sulfur Oxides (SO2)

Progress and Final Reports:

  • Final
  • SBIR Phase II:

    An Improved NOXSO Sorbent for the Removal of NOx and SOx from Flue Gas