Abstract
The effect of the calcination conditions on the catalytic activity for N2O decomposition of 2.5% RhOx/CeO2 catalysts has been investigated. Ramp and flash calcinations have been studied (starting calcinations at 25 or 250/350 °C, respectively) both for cerium nitrate and ceria-impregnated rhodium nitrate decomposition. The cerium nitrate calcination ramp has neither an effect on the physico-chemical properties of ceria, observed by XRD, Raman spectroscopy and N2 adsorption, nor an effect on the catalysts performance for N2O decomposition. On the contrary, flash calcination of rhodium nitrate improved the catalytic activity for N2O decomposition. This is attributed to the smaller size of RhOx nanoparticles obtained (smaller than 1 nm) which allow a higher rhodium oxide-ceria interface, favoring the reducibility of the ceria surface and stabilizing the RhOx species under reaction conditions.
Highlights
IntroductionCerium dioxide powders have potential applications in polishing powders, coatings for high-temperature optical and ceramic materials, gas sensors, catalysts for environmental processes like
Cerium dioxide powders have potential applications in polishing powders, coatings for high-temperature optical and ceramic materials, gas sensors, catalysts for environmental processes likeThree Way Catalyst (TWC), wet catalytic oxidation of organic pollutants, water gas shift (WGS) reaction, CO oxidation, combustion processes or in solid oxide fuel cell technology [1,2]
The current results suggest that flash calcination of rhodium nitrate allows obtaining a much better noble metal-support interaction than the conventional ramp calcinations
Summary
Cerium dioxide powders have potential applications in polishing powders, coatings for high-temperature optical and ceramic materials, gas sensors, catalysts for environmental processes like. Three Way Catalyst (TWC), wet catalytic oxidation of organic pollutants (removal of organics from wastewaters), water gas shift (WGS) reaction, CO oxidation, combustion processes or in solid oxide fuel cell technology [1,2]. Ceria is used either as metal support or as catalyst itself [1,3]. The use of ceria as noble metal support has attracted intense interest due to their vast applications in heterogeneous catalysis. Many factors, including the size and distribution of the noble metal particles, the surface morphology and defects on the oxides, affect the performance of noble metal/ceria catalysts. Effectively controlling the size of noble metal particles is crucial for maintaining high catalytic activity
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