Effect of Ce_0.45Zr_0.45Y_0.07La_0.03O_1.95/La-Ba-Al₂O₃ Mass Ratio on the Activity of Fe-Based Monolithic Catalysts for the Combustion of Thin Methane

Abstract

Ce0.45Zr0.45Y0.07La0.03O1.95, an oxygen storage material (OSM), and La-Ba-Al2O3 have been prepared by co-precipitation and peptization, respectively, to be used as supports for Fe2O3 catalysts. The Fe2O3 catalysts were obtained by impregnation methods and then coated on the monolith. The catalytic combustion of low concentration (thin) methane was investigated over the prepared catalysts. The effect of the OSM/La-Ba-Al2O3 mass ratio on the physicochemical properties of the catalysts was investigated using nitrogen adsorption-desorption, oxygen storage capacity (OSC) measurements, X-ray diffraction (XRD), and H2-temperature-programmed reduction (H2-TPR). The highest catalytic activity of both fresh and aged Fe2O3 catalysts for thin methane combustion was observed when the mass ratio of OSM/La-Ba-AL2O3 was 1:1. At this OSM/La-Ba-AL2O3 mass ratio, methane started to convert at 446°C and completely converted at 553°C, with 1% (volume fraction) CH4 and a gas hourly space velocity (GHSV) of 50000 h-1. The

Catalytic Oxidation of Soluble Organic Fraction in Diesel Exhausts Using Composite Oxides (CeO₂)<em>_x</em>(La-Al₂O₃)_1-<em>x</em>

“…The study also suggested that incorporating other metal elements such as Zr 4 + , La 3 + , Y 3 + , and Al 3 + into the CeO2 lattice to form solid solution greatly improved the thermal stability, redox properties, and OSC. [13][14][15][16] Zhang et al 17 prepared Ce0.6Zr0.4O2 solid solution using different methods, and then mechanically mixed the solid solution with γ-Al2O3 to examine the combined effect on the SOF catalytic oxidation capacity. The results suggested that the combination of Ce0.6Zr0.4O2 and Al2O3 formed using a solution combustion method gave the highest catalytic activity, with a light-off temperature of 200°C.…”