Potassium-containing coal chars as catalysts for NOx reduction in the presence of oxygen

M. J. Illán-Gómez, C. De Salinas-Martínez Lecea, A. Linares-Solano, L. R. Radovic

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46 Scopus citations

Abstract

The use of inexpensive potassium-containing coal chars for NOx reduction in a fuel-lean (oxygen-rich) environment has been investigated. Coals of different rank have been used as char precursors. Two types of experiments were performed to study the kinetics of the NOx/carbon reaction: (i) temperature-programmed reaction in a 15NO(0.5%)/O2(5%)/He mixture and (ii) isothermal reaction at 300 and 350°C. NOx adsorption at room temperature was also carried out using an identical mixture. Two characteristic temperature regimes were identified: (i) At temperatures below 200°C, NOx adsorption on the char surface is the more important phenomenon, (ii) At temperatures above 200°C, the true NOx reduction by carbons starts with N2 and CO2 being the main reaction products. A very active potassium-containing coal char has been prepared by using the following char preparation conditions: pyrolysis at 900°C and a KOH/coal ratio of 0.5/1.

Original languageEnglish (US)
Pages (from-to)1256-1264
Number of pages9
JournalEnergy and Fuels
Volume12
Issue number6
StatePublished - Dec 1 1998

All Science Journal Classification (ASJC) codes

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

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