Fabrication of carbon doped Cu-based oxides as superior NH3-SCR catalysts via employing sodium dodecyl sulfonate intercalating CuMgAl-LDH

Abstract

In this work, sodium dodecyl sulfonate (SDSO) intercalated CuMgAl Layered double hydroxide (CuMgAl-SDSO-LDH) was fabricated and derived catalyst (CuMgAl-SDSO-LDO) was innovatively evaluated as potential candidates for low temperature selective catalytic reduction of NO with NH3 (NH3-SCR). The results indicated that the existence of carbon from SDSO obviously affected the denitrification activity of CuMgAl-NO3-LDO, besides, the successful intercalation of SDSO was essential to catalytic performance. Series of characterizations analysis revealed that the best performance for CuMgAl-SDSO-LDO catalyst could be ascribed to higher dispersion and more appropriate valence state distribution of Cu, which were intrinsically relative with the moderate carbon doping content, thus leading to excellent SCR performance with 90% NOx conversion at 210 °C, above 75 % N2 selectivity at 90–330 °C and strong H2O/SO2 resistance ability. This work may provide a novel method to develop the carbon doped Cu-based catalysts and expand the applications of LDH in the field of SCR.