A metal chelate process for removal of nitric oxide from flue gas
- Lawrence Berkeley Lab., CA (United States)
Control of sulfur dioxide (SO{sub 2}) in flue gases has been achieved by utilization of its high solubility in aqueous solutions. Unlike sulfur dioxide, nitric oxide (NO) has low solubility in aqueous solutions. Consequently, achieving simultaneous control of sulfur dioxide and nitric oxide in flue gas has been difficult to achieve. Nitric oxide can be oxidized to nitrogen dioxide (NO{sub 2}), which is more soluble. However, many oxidants are expensive and some of the oxidant material may consumed by the oxidation of dissolved sulfur dioxide. Much of the effort of research for the control of nitric oxide has focused on the development of additives that enhance the solubility of nitric oxide in aqueous solutions. Of the additives investigated, the most promising compounds appear to be metal chelates which are capable of reacting with nitric oxide to form nitrosyl complexes. In recent years, we have investigated thiol-based ligands complexed with ferrous ions that have superior oxidation resistance and NO absorbing capacity. We report here the results of our study of a new thiol-based iron complex using 2,3-dimercapto-1-propane sulfonate (DMPS). It is superior to Fe{sup +2}(EDTA) chelate in three aspects: (1) the ability to reduce Fe{sup +3} to Fe{sup +2}, (2) the absence of nitrogen-sulfur byproducts, and (3) the ease of regeneration using electrochemical reduction. We present here results of the NO removal chemistry of Fe{sup +2}(DMPS){sub 2} and the electro-chemical regeneration of Fe{sup +2}(DMPS){sub 2}. Also presented are results of NO thermal desorption studies, which is an alternative regeneration method.
- OSTI ID:
- 254703
- Report Number(s):
- CONF-940813--
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
20 FOSSIL-FUELED POWER PLANTS
ABSORPTION
ADDITIVES
AFFINITY
AIR POLLUTION CONTROL
AQUEOUS SOLUTIONS
CHELATES
COMBUSTION PRODUCTS
DESORPTION
ELECTROCHEMICAL CELLS
FLUE GAS
IRON COMPLEXES
NITRIC OXIDE
REDUCTION
REGENERATION
SOLUBILITY
SORPTIVE PROPERTIES
SULFONATES
SULFUR COMPOUNDS
THIOLS