Catalytic combustion of methane over iron- and manganese-substituted lanthanum hexaaluminates

Abstract

A series of hexaaluminates, LaMnFe x Al 11-x O 19-d samples (x = 1, 2, 4, 6, 8) as new catalysts were prepared by carbonate precipitation and calcined at high temperature. Fe and Mn ions were used as active components to replace part of aluminum ions in the hexaaluminate lattices. The structures and properties of these samples were characterized by XRD, BET, and XPS. The series of hexaaluminates exhibited significant catalytic activity and stability at high temperature. The LaMnFe 2 Al 9 O 19-d retains a larger surface area and shows a good activity in methane combustion.

A study of Ni/Al2O3 and Ni–La/Al2O3 catalysts for the steam reforming of ethanol and phenol

“…The peak positions we found in the case of LA sample at 836.0 eV and 839.5 eV are at slightly higher energies than those reported for bulk La(OH) 3 [33] and, even more, than those reported for La 2 O 3 [33][34][35], LaAlO 3 [33,35]. and a number of La hexaaluminates [36][37][38]. This splitting is a consequence of two different final states in the photon emission, and as result of hybridization of 4f orbitals of La atoms with surrounding atoms (3d 9 4f 1 and 3d 9 4f 0 final states, for higher and lower binding energy peaks, respectively).…”

Acido-basicity of lanthana/alumina catalysts and their activity in ethanol conversion

“…, and a number of La hexaaluminates 33,34,35 . The peak position in our spectra is even more shifted to higher energies than those reported for other La/Al 2 O 3 samples 32 .…”

Synthesis of a Highly Stable Pd@CeO2 Catalyst for Methane Combustion with the Synergistic Effect of Urea and Citric Acid

“…So far, methane catalytic combustion is considered to be the most effective, economical, simple, and clean method to reduce residual methane in vehicle exhaust. In order to control such emissions, various catalysts for methane catalytic combustion were studied and prepared, such as precious metals, − perovskites, − and hexaaluminates. , In general, non-noble metal catalysts show high activity for methane oxidation only under the conditions of high temperature, high pressure, or other harsh terms, which will result in the increase of pollutants and more energy consumption. In contrast, the noble metal catalysts, especially the supported palladium catalysts, , exhibit high catalytic activity for methane complete combustion. , …”