Thermally stable Pd/CeO₂@SiO₂ with a core–shell structure for catalytic lean methane combustion

Abstract

Noble metal catalysts have high catalytic activity in lean CH4 combustion at low temperatures. However, the high surface energy of noble metal nanoparticles makes them susceptible to deactivation due to...

CO2 Hydrogenation to Methanol over Mesoporous SiO2-Coated Cu-Based Catalysts

“…The metallic surface area of catalysts (Table ) was accessed through the H 2 consumption related to the reduction of the surface CuO layer, previously generated by controlled oxidation under an N 2 O stream . It is possible to note that the dispersion of copper atoms in the CuZrIn@mSiO 2 and CuCeIn@mSiO 2 catalysts was around 3–4 times higher than that observed for the pristine samples, which can be explained in terms of the efficiency of the solvothermal method in generating well-dispersed particles, as well as the functionality of the SiO 2 coating in preventing particle aggregation during thermal treatments. , Despite the notably higher dispersion, the increase in the metallic surface area (Table ) was not proportional to differences in catalyst composition. SiO 2 is the most abundant compound within coated materials, and the active phase content (Cu, InO x , ZrO 2, and CeO 2 ) constitutes only a tiny fraction of the catalyst compared to uncoated ones.…”