Abstract
A Mn-Fe/Z catalyst was prepared by industrial waste lithium silicon powder (LSP) and natural ferromanganese ore for high efficiency removal of NOx in flue gas. In the support synthesis stage, activated carbon (AC) was added to regulate the pore structure and surface physicochemical properties of the catalyst. The NO conversion at 125 °C increased from 71.8% (Mn-Fe/Z0, without AC added) to 95.1% (Mn-Fe/Z1, 1.0 wt% AC added). The introduction of AC promoted the formation of mesopores, surface adsorbed oxygen, and Mn4+, which were beneficial to the electron transfer and the oxidation–reduction cycle of SCR. Besides, the AC addition weakened the chemical bond of Mn-O and Fe-O on Mn-Fe/Z, and promoted the formation of surface acid sites, which facilitated the NH3-SCR. Lewis acid sites participated in NH3-SCR, and the adsorbed NH3 reacted with gaseous NO species followed the Eley-Rideal (E-R) reaction mechanism. The above findings provide useful information for new catalyst design for NH3-SCR at low temperature.
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