Preparation, characterization and catalytic performance of SrTi_(0.9)Li_(0.1)O_3 ultrafine powders

摘要

SrTi_(0.9)Li_(0.1)O_3 ultra-fine perovskite oxide powders were prepared by the ultrasonic spray pyrolysis technique and sol-gel method, respectively. We investigated the physical properties (i.e. crystalline phase and the microstructure) of the prepared powders using XRD, PSD, SEM and TEM techniques and also evaluated the catalytic performance of the resulting powders to the oxidative coupling of methane (OCM). By adding NH_4NO_3 into the precursor solution, uniform, solid and spherical SrTi_(0.9)Li_(0.1)O_3 particles with a diameter of around 500 ran and the single perovskite crystal phase can be obtained at 900 deg C. The resulting SrTi_(0.9)Li_(0.1)O_3 ultrafine power prepared by the spray pyrolysis exhibited a much better catalytic performance (higher C_2 selectivity and C_2 yield) to OCM than that prepared by the sol-gel method.