Facile synthesis of three-dimensional ordered macroporous Sr1−xKxTiO3 perovskites with enhanced catalytic activity for soot combustion

摘要: Three-dimensionally ordered macroporous (3DOM) perovskite catalysts possessing sufficient contact points are conducive to improving the catalytic combustion of soot. In this work, 3DOM Sr1−xKxTiO3 (x = 0, 0.1, 0.2, and 0.3) perovskite-type were prepared through a colloidal crystal templating method. The as-prepared samples analyzed by FESEM, TEM, XRD, FT-IR, N2 adsorption–desorption, H2-TPR, XPS, O2-TPD XRF techniques as well simulated soot reactions afterwards, investigate morphologies, physicochemical properties activity performance. Titanium sol can convert TiO2 at relatively low temperature stabilize structure, which is beneficial for restraining destruction skeleton after potassium introduced. On one hand, presence form more oxygen vacancies, may facilitate generation active species accelerate combustion. other eutectic compounds come into existence, promoting between catalyst. Nevertheless, too much will some extent destroy skeleton. Comprehensively considering intrinsic structural integrity, Sr0.8K0.2TiO3 catalyst shows best with T50 382 °C.