Abstract
Catalytic oxidation of NO (CONO) at ambient temperature over sludge char (SC) prepared from sewage sludge was studied in this paper. The influencing mechanism of sludge pyrolysis/activation parameters on the CONO were investigated for the SC prepared with different pyrolysis temperatures (600, 700, and 800 °C) and different mass ratios of dried sludge (DS) to KOH (DS/KOH = 4:1, 3:1, 2:1, and 1:1). The results indicated that both pyrolysis temperature and KOH activation had great influence on the catalytic performance of SC. With the increase of temperature from 600 to 800 °C, the NO conversion increased from 12% to 36%. However, the catalytic activity of KOH-activated SC increased and then decreased with the increase of KOH content. The SC prepared under the pyrolysis temperature of 700 °C and the DS/KOH mass ratio of 3:1 showed the best catalytic performance with NO conversion of 56%. The NO conversion further increased to 76.5% when the SC was reduced by H2. It was also found that there was a strong correlation between the catalytic activity and the specific surface area of the SCs. The reaction might follow the Eley-Rideal (E-R) mechanism.
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