Novel technologies for SO{sub x}/NO{sub x} removal from flue gas

Technical Report · Sun Dec 31 00:00:00 EST 1995

DOI:https://doi.org/10.2172/207582· OSTI ID:207582

Kung, Harold; Kung, Mayfair ^[1]; Spivey, J J; Jang, Ben W ^[2]

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1. Northwestern Univ., Chicago, IL (United States)
2. Research Triangle Inst., Research Triangle Park, NC (United States)

The goal of this project is to develop a cost-effective low temperature deNO{sub x} process. NO{sub x} removal at temperatures between 120C--150C was investigated using the approaches of (1) selective reduction of NO{sub x} by alcohol or acetone (2) adsorption of NO{sub x} with an effective sorbent. The chief problem encountered in low temperature reduction of NO was catalyst deactivation due to coke formation. In this quarter, a possible solution explored was increasing the loading of precious metals (Pd and Ag) on oxide supports, as precious metals are known to be effective in the oxidation of hydrocarbons at low temperatures. However, no improvement was observed. Another solution was the replacement of NO by NO{sub 2} in the feed for the carbon-based catalyst tested, as NO{sub 2} was observed to slow down the deactivation rate over Cu-ZrO{sub 2} catalyst. However, rapid reduction of NO{sub 2} to NO by the carbon support occurred, making this approach impractical. As part of this approach, search for better NO oxidation catalysts continued this quarter. It was found that on different carbon catalysts at 30C and a W/F of 0.01g.min/cc, NO conversion to NO{sub 2} between 82--90% can be achieved. This activity, however, decreased with increasing temperature. SO{sub 2} also poisoned the oxidation activity of the activated carbon. Au dispersed on lanthanum oxide was another catalyst tested and had an NO conversion to NO{sub 2} of 17% at 250C. The catalytic performance of this catalyst could be improved by increasing its surface area. Finally, the adsorption capacity of NO{sub x} of a carbon sample provided by ISGS and an inorganic sorbent were tested. The capacity of the inorganic sorbent was found to be much higher.

• Research Organization: Northwestern Univ., Chicago, IL (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: FC22-92PC92521
• OSTI ID: 207582
• Report Number(s): DOE/PC/92521-T261; ON: DE96007808
• Resource Relation: Other Information: PBD: [1995]
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
20 FOSSIL-FUELED POWER PLANTS
54 ENVIRONMENTAL SCIENCES
FLUE GAS
DENITRIFICATION
NITROGEN OXIDES
SELECTIVE CATALYTIC REDUCTION
OXIDATION
CATALYSTS
COMPARATIVE EVALUATIONS
REMOVAL
ADSORPTION
PROGRESS REPORT
DESULFURIZATION
COBALT
ALUMINIUM OXIDES
COPPER
ZIRCONIUM OXIDES
ACTIVATED CARBON
SILVER
EXPERIMENTAL DATA
LANTHANUM OXIDES