Alkali-alumina sorbents for high-temperature removal of SO/sub 2/

Journal Article · Sun Feb 01 04:00:00 EST 1987 · A.I.Ch.E. J.; (United States)

OSTI ID:5530547

Gavalas, G R; Edelstein, S; Flytzani-Stephanopoulos, M; Weston, T A

The high-temperature removal of SO/sub 2/ by sorbents consisting of sodium and lithium salts supported on ..cap alpha..-Al/sub 2/O/sub 3/ has been investigated with emphasis on the chemistry of regeneration. The sulfated sorbents were regenerated by reduction with CO at 700-800/sup 0/C in a thermogravimetric analyzer and a packed-bed microreactor. Sulfur removal from the sorbent and distribution of gaseous products were measured at different alkali loadings, temperatures, and CO concentrations. The results are interpreted in terms of a network of reactions wherein alumina is important as a catalyst and as a reactant. During regeneration sulfate is converted to aluminate and sulfide, the fraction of aluminate defining the extent of regeneration. The rate and extent of sulfur removal increase with the ratio of alumina to alkali and are higher in the presence of lithium. The product gas consists of SO/sub 2/, COS, and elemental sulfur, the latter compound constituting up to 35% of the sulfur removed.

• Research Organization: Dept. of Chemical Engineering, California Institute of Technology, Pasadena, CA 91125
• OSTI ID: 5530547
• Journal Information: A.I.Ch.E. J.; (United States), Journal Name: A.I.Ch.E. J.; (United States) Vol. 33:2; ISSN AICEA
• Country of Publication: United States
• Language: English

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54 ENVIRONMENTAL SCIENCES
ADSORBENTS
ADSORPTION
AIR POLLUTION CONTROL
ALKALI METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYST SUPPORTS
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
CONTROL
DESULFURIZATION
GASEOUS WASTES
GRAVIMETRIC ANALYSIS
HALIDES
HALOGEN COMPOUNDS
KINETICS
LITHIUM CHLORIDES
LITHIUM COMPOUNDS
LITHIUM HALIDES
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
QUANTITATIVE CHEMICAL ANALYSIS
REACTION KINETICS
REGENERATION
REMOVAL
SODIUM CHLORIDES
SODIUM COMPOUNDS
SORPTION
SORPTIVE PROPERTIES
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
SURFACE PROPERTIES
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
VERY HIGH TEMPERATURE
WASTES
YIELDS