摘要 : In SCR denitrification technology, the conventional coprecipitation method has the disadvantages of high temperature and difficulty in controlling the precipitation rate. Various CexCuTiO2 catalysts were synthesized using ice-melt... 展开 In SCR denitrification technology, the conventional coprecipitation method has the disadvantages of high temperature and difficulty in controlling the precipitation rate. Various CexCuTiO2 catalysts were synthesized using ice-melting (CexCuTi-Ice) and conventional coprecipitation (CexCuTi-Con) methods for the selective catalytic reduction (SCR) of NO with NH3. Ce0.4CuTi-Ice catalyst exhibited excellent catalytic activity among the CexCuTiO2 catalysts, and 80% NOx conversion was achieved within a temperature range of 250-375 & DEG;C, exceeding that of Ce0.4CuTi-Con catalyst by 20%; in addition, N-2 selectivity was nearly 100%. To elucidate the release characteristics of the precursor solution during ice-melting synthesis, the changes of Cu and Ce concentrations in the solution were investigated by ICP-OES. The precursor solution was released at a slow rate via the ice-melting method, resulting in a large surface area, small crystallite sizes, and effective uniform nanoparticles with abundant active species and increased surface acidity. The promoted mechanism could be attributed to the enhanced oxidation of NO to NO2 at low temperatures and the rapid reaction between NO species and coordinated NH3 at high temperatures. (c) 2022 Society of Chemical Industry (SCI). 收起