Abstract
Three different types of perovskite-based nanocomposites were synthesized by calcination of the same gel mixtures (molar ratio for La:Sr:Co 0.4:0.6:1.0) under different reaction conditions (unconventional method: calcination at 1000 °C and 800 °C under vacuum; and conventional method: calcination in air at 1000 °C). The obtained products were studied by multianalytic techniques including powder X-ray diffraction (PXRD), high-resolution transmission electron microscopy (HRTEM), energy dispersive X-ray spectroscopy (EDX), and X-ray photoelectron spectroscopy (XPS). NOx reduction using propene (C3H6) as a reductant in the presence of oxygen was studied using temperature-programmed surface reaction (TPSR). The analyzed results showed that multiphase products were found by the unconventional method (in the absence of oxygen), whereas the conventional method (in the presence of oxygen) yielded single-phase perovskites. The multiphase nanocomposite products prepared under vacuum at 1000 °C exhibited higher catalytic activity and higher N2 yield compared with the samples obtained under vacuum at lower temperature (800 °C) and the single-phase perovskites.
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