Effect of primer on honeycomb-supported La0.9Ce0.1CoO3±δ perovskite for methane catalytic flameless combustion

Structured Perovskite-Based Catalysts and Their Application as Three-Way Catalytic Converters—A Review

“…Perovskite-type materials used to prepare washcoated catalysts are generally obtained by conventional techniques such as the amorphous citrate method (CM) [106,117,118], co-precipitation [94,100,119] or flame-assisted synthesis (e.g., flame hydrolysis [118,[120][121][122]). The solvent of the slurry is typically water [39,117,[120][121][122][123][124] but organic solvents, such as n-butanol, are sometimes employed [62,63].…”

“…A critical parameter known to influence the stability of a slurry is the size of the suspended particles. If these particles are sufficiently small (i.e., if the selected synthesis protocol produces very fine catalyst particles [121] or if an appropriate size fraction has formerly been collected through grinding and sieving [126]), they can be easily dispersed by low energy ball-milling [118,[120][121][122] or even simple stirring at room temperature [117]. Otherwise, the slurry must be submitted to high energy ball-milling in order to attain catalyst particles of the desired size, typically below 5 µm [106].…”

“…Contrary to flame-made powders, such materials never experienced high temperatures and are characterized by a poor thermal stability. As a consequence, a coated CM-made perovskite powder is significantly deactivated after exposure to a temperature of 800 °C [120] and large cracks appear between the active phase and the carrier [118]. The composition of the mixed oxide is also of great importance because it influences the surface chemistry (e.g., nature and density of surface groups) of the oxide as well as the way the latter bonds to the carrier.…”

“…This very thin layer constituted of one or several oxide(s) (e.g., Al 2 O 3 , TiO 2 , La 2 O 3 ) is applied to the carrier prior to washcoat. It is generally obtained by dipping the substrate in a water-based sol [118,120,125,126] or an aqueous solution containing precursors [118]. The nanoparticles in the sol or the ions in the solution easily interact with the surface of the structured carrier, producing a well-adhered, dense oxide layer upon calcination.…”

Effect of Preparation Method on Catalytic Properties of Double Perovskite Oxides LaSrFeMo<sub>0.9</sub>Co<sub>0.1</sub>O<sub>6</sub> for Methane Combustion

“…Catalytic combustion of nature gas is a crucial technology both for energy production and for environmental pollution abatement [1]- [4]. For heat generation process, using natural gas as fuel, catalytic combustion instead of the conventional combustion has several advantages, such as high efficiency and lower temperature which effectively suppresses thermal NO x formation.…”