Document Detail


Factors influencing the preparation of supported iron oxide in fluidized-bed crystallization.
MedLine Citation:
PMID:  14637343     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Our previous work applied a novel supported iron oxyhydroxide (FeOOH) catalyst to effectively treat benzoic acid by hydrogen peroxide. The FeOOH catalyst was prepared via the oxidation of Fe2+ by H2O2 in the acidic condition using a fluidized-bed crystallization reactor. The major components coated on the surface were identified as amorphous FeOOH and gamma-FeOOH. In terms of the crystallization conditions of FeOOH, some parameters including the operational pH, superficial velocity, specific iron loading, and influent H2O2 concentration were investigated to quantify their effects on the crystallization efficiency. All these parameters were found to significantly influence the crystallization efficiency. Two types of FeOOH catalysts were synthesized: FeOOH I was prepared at pH 3.5, and FeOOH II was formed by aging FeOOH I at pH 13. The percentages of surface amorphous FeOOH reduced from 70% to 30% after aging. The FeOOH II catalyst presented a higher reactivity toward H2O2 but lower stoichiometric efficiency in oxidizing benzoic acid than FeOOH I, similar to the result of the commercial goethite. Therefore, it is concluded that the crystalline property significantly affects the performance of catalytic oxidation.
Authors:
Shanshan Chou; Chi-Chung Liao; Shwu-Huey Perng; Sheng-Hsin Chang
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Chemosphere     Volume:  54     ISSN:  0045-6535     ISO Abbreviation:  Chemosphere     Publication Date:  2004 Feb 
Date Detail:
Created Date:  2003-11-25     Completed Date:  2004-02-03     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0320657     Medline TA:  Chemosphere     Country:  England    
Other Details:
Languages:  eng     Pagination:  859-66     Citation Subset:  IM    
Affiliation:
Environmental Technology Division, Center for Environmental, Safety & Health Technology Development, Industrial Technology Research Institute, 321 Kuang Fu Road, S-2, Hsinchu 300, Taiwan, ROC. shanshan_chou@itri.org.tw
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MeSH Terms
Descriptor/Qualifier:
Catalysis
Crystallization
Ferric Compounds / chemistry*
Hydrogen Peroxide
Hydrogen-Ion Concentration
Water Purification / methods*
Chemical
Reg. No./Substance:
0/Ferric Compounds; 1309-37-1/ferric oxide; 7722-84-1/Hydrogen Peroxide

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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