Abstract
Coating procedure for ceramic monoliths was optimized by wash coating with ϒ-alumina for the deposition of Au sensitized La–CeO2 catalyst. Effect of four different catalyst coating methods on ceramics monolith surface for toluene catalytic activity was investigated. Au sensitized La–CeO2 catalyst was prepared via wetness impregnation and co-precipitation chemical methods. The catalyst was characterized using XRD, FESEM, EDS, TEM, XPS, Raman, BET and Elemental mapping techniques. Nanoparticles composed flakes morphology of catalyst was confirmed by electron microscopy. Average nanocrystalline size of 6.7 nm and surface area 33 m2/g of catalyst was estimated using Scherrer's formula and BET analysis respectively. Adherence tests were carried out by applying ultrasonic vibrations and hot air blower to optimize ϒ-alumina coating on ceramics monolith. Toluene catalytic activity studied at different operating temperatures and concentrations. Stability and reuse of catalyst coated ceramics monoliths for toluene activity were confirmed. A mechanism of toluene degradation was briefed.
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