Record Display for the EPA National Library Catalog


Main Title Development of the Aqueous Processes for Removing NO(x) from Flue Gases.
Author Chappel, Gilford A. ;
CORP Author Esso Research and Engineering Co., Linden, N.J. Government Research Lab.
Year Published 1972
Report Number EPA-68-02-0220; R2-72-051;
Stock Number PB-214 053
Additional Subjects ( Nitrogen oxides ; Adsorption) ; ( Air pollution ; Nitrogen oxides) ; Adsorbents ; Chemisorption ; Scrubbers ; Sodium sulfites ; Limestone ; Hydroxides ; Flue gases ; Mixtures ; Sulfur dioxide ; Carbonates ; Alkaline scrubbing ; Wet methods ; Air pollution control
Library Call Number Additional Info Location Last
NTIS  PB-214 053 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 212p
A screening study was conducted to evaluate the capability of aqueous solutions to scrub NO(x) from the flue gases emitted by stationary power plants fired with fossil fuels. The key findings discussed include: The addition of NO2 to flue gas to improve NO(x) (mostly NO) absorption does not appear promising; Sulfite solutions and slurries are efficient NO2-SO2 absorbents; Calcium magnesium, and zinc hydroxide slurries are effective NO2-SO2 absorbers; Limestone (CaCO3) is also a good NO-SO2 absorbent for the same reasons as for Ca(OH)2; NO2 scrubbing is enhanced by removing oxygen from the flue gas or by adding an anti-oxidant such as hydroquinone to the scrubbing solution; Sulfide solutions are excellent NO2 and SO2 absorbers but do generate a small amount of NO; and Part of the absorbed SO2 is oxidized to sulfate. Combined NO(x)-SO(x) scrubbing seems feasible using any of several hydroxide or carbonate systems provided NO(x) (NO) can be efficiently oxidized to NO2 upstream from the scrubbing unit. (Author)