Document Detail

SOx removal by calcined MgAlFe hydrotalcite-like materials: effect of the chemical composition and the cerium incorporation method.
MedLine Citation:
PMID:  16475357     Owner:  NLM     Status:  MEDLINE    
Sulfur oxides are one of the most hazardous atmospheric pollutants since they contribute directly to acid rain formation. Consequently, stringent environmental regulations limit atmospheric SOx emissions, motivating research on efficient ways to reduce them. To supply an alternative to reduce these emissions in fluid catalytic cracking units, this study discloses efficient SOx reducing materials based on calcined MgAlFe hydrotalcite-like compounds (HT's). Thus, HT materials were synthesized by several methods including cerium addition. The adsorption of SO2 was carried out by contacting the calcined solid with a mixture of SO2 (1%) in air at 650 degrees C. It was demonstrated that the isomorphic incorporation of iron increased its reduction capability which was reflected in higher reduction rates and metal sulfate reduction grade at 550 degrees C. Moreover, when cerium was present in the iron-containing materials the saturation rate was improved, because cerium oxide promotes the oxidation of SO2 to SO3. The way cerium is incorporated influences the SO2 adsorption capacity.
Manuel Cantú; Esteban López-Salinas; Jaime S Valente; Ramon Montiel
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Environmental science & technology     Volume:  39     ISSN:  0013-936X     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2005 Dec 
Date Detail:
Created Date:  2006-02-14     Completed Date:  2006-05-03     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  9715-20     Citation Subset:  IM    
Instituto Mexicano del Petróleo, Eje Central Lázaro Cárdenas #152, Col. Sn. Bartolo Atepehuacan, C.P. 07730, G. A. Madero, Mexico, D.F.
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MeSH Terms
Air Pollution / prevention & control*
Aluminum / chemistry
Aluminum Hydroxide / chemistry*
Cerium / chemistry*
Iron / chemistry
Magnesium / chemistry
Magnesium Hydroxide / chemistry*
Microscopy, Electron, Scanning
Sulfates / chemistry
Sulfur Dioxide / isolation & purification*
Reg. No./Substance:
0/Sulfates; 12304-65-3/hydrotalcite; 1309-42-8/Magnesium Hydroxide; 21645-51-2/Aluminum Hydroxide; 7429-90-5/Aluminum; 7439-89-6/Iron; 7439-95-4/Magnesium; 7440-45-1/Cerium; 7446-09-5/Sulfur Dioxide

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