NO Reduction by Activated Carbons. 5. Catalytic Effect of Iron

M. José Illán-Gómez, Angel Linares-Solano, Ljubisa R. Radovic, Concepción Salinas-Martínez de Lecea

Research output: Contribution to journalArticle

63 Citations (Scopus)

Abstract

The effect of iron as catalyst of the NO-carbon reaction has been investigated. A coal-derived carbon was loaded with iron using different methods and different precursors. A brief exploratory study was also conducted with pitch-derived carbon fibers. The iron-loaded and/or parent carbons were characterized by physical adsorption of CO2 (at 0 °C) and N2 (at -196 °C), X-ray absorption fine structure spectroscopy (XAFS), and chemisorption of CO at 25 °C. The NO-carbon reaction was studied in a fixed-bed flow reactor at atmospheric pressure using two types of experiments: (i) temperature-programmed reaction (TPR) in a NO/He mixture, and (ii) isothermal reaction at 300-600 °C. The reaction products were monitored in both cases, thus allowing detailed oxygen and nitrogen balances to be determined. Iron was found to catalyze NO reduction by carbon through an oxidation/reduction (redox) mechanism similar to that reported previously for potassium- and calcium-catalyzed reaction. Nevertheless, the iron species present on the carbon surface before NO reduction (FexOy or FeO) are less effective than the potassium species (elemental potassium or potassium suboxide) in chemisorbing NO, as a result of which they transfer less oxygen to the carbon active sites. The results show also that the nature of the catalyst precursor, the catalyst preparation conditions and the reducibility of the catalyst by the carbon determine the chemical state of the catalyst, its dispersion and catalyst/substrate contact, and hence control the catalytic activity of iron in NO reduction by carbon.

Original languageEnglish (US)
Pages (from-to)540-548
Number of pages9
JournalEnergy and Fuels
Volume9
Issue number3
DOIs
StatePublished - Jan 1 1995

Fingerprint

Activated carbon
Carbon
Iron
Catalysts
Potassium
X ray absorption fine structure spectroscopy
Oxygen
Coal
Carbon Monoxide
Chemisorption
Reaction products
Atmospheric pressure
Carbon fibers
Calcium
Catalyst activity
Nitrogen
Adsorption
Substrates

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology

Cite this

Illán-Gómez, M. J., Linares-Solano, A., Radovic, L. R., & Salinas-Martínez de Lecea, C. (1995). NO Reduction by Activated Carbons. 5. Catalytic Effect of Iron. Energy and Fuels, 9(3), 540-548. https://doi.org/10.1021/ef00051a020
Illán-Gómez, M. José ; Linares-Solano, Angel ; Radovic, Ljubisa R. ; Salinas-Martínez de Lecea, Concepción. / NO Reduction by Activated Carbons. 5. Catalytic Effect of Iron. In: Energy and Fuels. 1995 ; Vol. 9, No. 3. pp. 540-548.
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Illán-Gómez, MJ, Linares-Solano, A, Radovic, LR & Salinas-Martínez de Lecea, C 1995, 'NO Reduction by Activated Carbons. 5. Catalytic Effect of Iron', Energy and Fuels, vol. 9, no. 3, pp. 540-548. https://doi.org/10.1021/ef00051a020

NO Reduction by Activated Carbons. 5. Catalytic Effect of Iron. / Illán-Gómez, M. José; Linares-Solano, Angel; Radovic, Ljubisa R.; Salinas-Martínez de Lecea, Concepción.

In: Energy and Fuels, Vol. 9, No. 3, 01.01.1995, p. 540-548.

Research output: Contribution to journalArticle

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Illán-Gómez MJ, Linares-Solano A, Radovic LR, Salinas-Martínez de Lecea C. NO Reduction by Activated Carbons. 5. Catalytic Effect of Iron. Energy and Fuels. 1995 Jan 1;9(3):540-548. https://doi.org/10.1021/ef00051a020