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Titolo:
Electrochemical and XAFS investigation of nitrite reduction by heat-treated mu-oxo derivative of iron phthalocyanine supported on high area carbon
Autore:
Choi, HJ; Kwag, G; Kim, S;
Indirizzi:
Konkuk Univ, Dept Chem, Seoul 143701, South Korea Konkuk Univ Seoul South Korea 143701 ept Chem, Seoul 143701, South Korea Korea Kumho Petrochem Co, Kumho Chem Labs, Taejon 305600, South Korea Korea Kumho Petrochem Co Taejon South Korea 305600 n 305600, South Korea
Titolo Testata:
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
fascicolo: 1-2, volume: 508, anno: 2001,
pagine: 105 - 114
Fonte:
ISI
Lingua:
ENG
Soggetto:
ABSORPTION FINE-STRUCTURE; ELECTROLYTE FUEL-CELLS; ELECTROCATALYTIC REDUCTION; OXOCHROMIUM COMPOUNDS; MOLECULAR-STRUCTURE; CATALYTIC ACTIVITY; OXYGEN REDUCTION; HIGH-TEMPERATURE; PORPHYRIN; PYROLYSIS;
Keywords:
nitrite reduction; mu-oxo derivative of iron phthalocyanine; heat-treatment; XANES; EXAFS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
34
Recensione:
Indirizzi per estratti:
Indirizzo: Kim, S Konkuk Univ, Dept Chem, Seoul 143701, South Korea Konkuk Univ Seoul South Korea 143701 m, Seoul 143701, South Korea
Citazione:
H.J. Choi et al., "Electrochemical and XAFS investigation of nitrite reduction by heat-treated mu-oxo derivative of iron phthalocyanine supported on high area carbon", J ELEC CHEM, 508(1-2), 2001, pp. 105-114

Abstract

The electrochemical nitrite reduction by heat-treated (FePC)(2)O/KB (KB = Ketjen Black) in the range of 500 - 1000 degreesC has been done in 0.5 M sulfuric acid and the effect of heat-treatment on the structural aspects has been investigated by X-ray absorption fine structure. (FePC)(2)O before heat-treatment displayed exactly the same voltammetric behavior and catalytic activity toward nitrite reduction as FePc. Nitric oxide that was produced by disproportionation of nitrite formed a stable adduct with FePc before being irreversibly reduced. The catalytic activity, which was highest for a nonheat-treated sample, decreased monotonically as the heat-treatment temperature increased, which followed approximately the nitrogen-to-carbon ratio in the sample. XANES and EXAFS analyses showed that (i) the mu -oxo structure was still maintained upon adsorption and (ii) (FePc)(2)O was converted toFePc in the range of 500-600 degreesC and to an Fe2O3-like structure above900 degreesC. The loss of catalytic activity has been attributed to an alteration from the phthalocyanine structure. It is concluded that the Fe-N-4 structure is essential for maintaining the catalytic activity. (C) 2001 Elsevier Science B.V. All rights reserved.

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Documento generato il 04/04/20 alle ore 02:32:50