Performance enhancement of NH3-SCR via employing hydrotalcite-like precursor to induce the decoration of NiO by TiO2 phase

In this work, NiO phase was decorated by titanium species to achieve NiTi mixed oxides acting as NH3-SCR catalysts, (NiTi-IMP, NiTi-SOL and NiTi-LDO) which were fabricated via solution-impregnation, one-pot sol-gel and urea homogeneous precipitation methods followed by a calcination process. The microstructure and morphology features as well as the inherent morphology-activity relationship of resultant samples were fully characterized by XRD, BET, SEM, TEM/HRTEM, XPS, ICP-AES, NH3-TPD and H-2-TPR. The results pronouncedly affirmed that the NiTi-LDO behaved the optimum SCR performance, affording a desiring efficiency (over 90% NO conversion within the temperature region of 240-360 degrees C), preferable N-2 selectivity (nearby 95% at the whole test temperature zone), superior catalytic stability and SO2/H2O resistance. The improvement of catalytic performance could be attributed to the assistance of hydrotalcite-like precursor possessing special morphology structure, and the subsequently generated favorable interfacial interaction as well as the atomic-level dispersion of active component during the calcination process.