Solid sorbent control of nitrogen oxides (NOx). Final report, September 1996--January 1999

Technical Report · Mon Jan 18 00:00:00 EST 1999

OSTI ID:678879

Lee, M R

Solid materials have demonstrated applicable control of combustion-source NOx. A support material of (gamma)-alumina can provide improved NOx sorption in comparison to a previously applied sorbent, magnesia-coated vermiculite. NOx sorption of treated (gamma)-alumina correlates with the ionization potential of the group-1 element. General mechanisms of NOx sorption have been developed for untreated, K{sub 2}CO{sub 3}-treated and KOH-treated (gamma)-alumina. Sorption of NO appears to increase formation of nitrite. Untreated (gamma)-alumina formed little nitrite. For the treated (gamma)-alumina, the ratio of nitrite-nitrate formed relates to the ratio of NO-to-NO{sub 2} sorbed. Additional NO{sub 2} exposure converts nitrite into nitrate and NO. This nitrite-to-nitrate conversion correlates with the thermal stability of subsurface species. In addition, thermal-decomposition tests indicated similarities of NOx-exposed sorbents to nitrite and nitrate salts. The proposed mechanisms suggest that formed nitrite stability is crucial to improving NOx sorption. Effects of additional gases (O{sub 2}, SO{sub 2}, CO{sub 2}, or water vapor) to NO and NO{sub 2} sorption at 25 and 250 deg C by untreated, K{sub 2}CO{sub 3}-treated and KOH-treated (gamma)-alumina were evaluated. Only SO{sub 2} and water vapor were observed to affect NOx sorption.

• Research Organization: Florida Univ., Coll. of Engineering, Gainesville, FL (United States)
• OSTI ID: 678879
• Report Number(s): AD-A-364151/XAB; CNN: Contract F08637-96-C-6015; TRN: 92290220
• Resource Relation: Other Information: PBD: 18 Jan 1999
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
01 COAL, LIGNITE, AND PEAT
NITROGEN OXIDES
ADSORBENTS
AIR POLLUTION CONTROL
ALUMINIUM OXIDES
SORPTIVE PROPERTIES
NITRIC OXIDE
NITROGEN DIOXIDE
ADSORPTION