Reduction by Activated Carbons. 4. Catalysis by Calcium

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

Research output: Contribution to journalArticle

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Abstract

The effect of calcium as catalyst of the NO-carbon reaction has been investigated. Three carbons of different origin and surface properties were loaded by ion exchange with calcium acetate. The effect of catalyst loading was also investigated in one of the carbons. The samples were characterized by physical adsorption of CO2 (at 0 °C) and N2 (at -196 °C) and by chemisorption of CO2 at 300 °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 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. Calcium was found to catalyze NO reduction by carbon through a mechanism that is consistent with the formation of intermediate CaO(O) surface species. Nevertheless, the calcium species present on the carbon surface before NO reduction (CaO) are much less effective than the potassium species (elemental potassium or potassium suboxide) in chemisorbing NO, as a result of which they transfer much less oxygen to the carbon active sites. The results show also that the porous structure and the surface chemistry of the carbon determine, in a complex way, the catalyst loading and dispersion, as well as the catalyst/substrate contact, and hence control the catalytic activity of calcium in NO reduction by carbon.

Original languageEnglish (US)
Pages (from-to)112-118
Number of pages7
JournalEnergy and Fuels
Volume9
Issue number1
DOIs
StatePublished - Jan 1 1995

Fingerprint

Activated carbon
Catalysis
Calcium
Carbon
Potassium
Catalysts
calcium acetate
Oxygen
Chemisorption
Surface chemistry
Reaction products
Atmospheric pressure
Surface properties
Catalyst activity
Ion exchange
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). Reduction by Activated Carbons. 4. Catalysis by Calcium. Energy and Fuels, 9(1), 112-118. https://doi.org/10.1021/ef00049a017
Illán-Gómez, M. José ; Linares-Solano, Angel ; Radovic, Ljubisa R. ; Salinas-Martínez de Lecea, Concepción. / Reduction by Activated Carbons. 4. Catalysis by Calcium. In: Energy and Fuels. 1995 ; Vol. 9, No. 1. pp. 112-118.
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Illán-Gómez, MJ, Linares-Solano, A, Radovic, LR & Salinas-Martínez de Lecea, C 1995, 'Reduction by Activated Carbons. 4. Catalysis by Calcium', Energy and Fuels, vol. 9, no. 1, pp. 112-118. https://doi.org/10.1021/ef00049a017

Reduction by Activated Carbons. 4. Catalysis by Calcium. / Illán-Gómez, M. José; Linares-Solano, Angel; Radovic, Ljubisa R.; Salinas-Martínez de Lecea, Concepción.

In: Energy and Fuels, Vol. 9, No. 1, 01.01.1995, p. 112-118.

Research output: Contribution to journalArticle

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Illán-Gómez MJ, Linares-Solano A, Radovic LR, Salinas-Martínez de Lecea C. Reduction by Activated Carbons. 4. Catalysis by Calcium. Energy and Fuels. 1995 Jan 1;9(1):112-118. https://doi.org/10.1021/ef00049a017