Mesoporous Silica-Supported Nanostructured PdO/CeO₂ Catalysts for Low-Temperature Methane Oxidation

Abstract

Nanostructured PdO/CeO supported on mesoporous SBA-15 silica was synthesized using a combination of incipient wetness impregnation and surface-assisted reduction. After calcination, the materials showed good activity as catalysts for the low-temperature oxidation of methane, with a sample having 5 wt % Pd loading showing 50% conversion to CO at ∼290 °C and complete conversion below 360 °C. The stability of catalysts in the presence of water was studied. The formation of Pd(0) during the methane oxidation reaction increases the oxygen vacancies on the surface of catalysts, improving the catalytic activity.

Thermally Induced Structural Evolution of Palladium‐Ceria Catalysts. Implication for CO Oxidation

“…Agglomerates of PdO and CeO 2 nanoparticles were observed in our previous work, although a different method of synthesis was employed . Similar core‐shell structures have been reported in other works …”

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

“…CeO 2 has been extensively used to act as a carrier for noble metal nanoparticles because of the excellent performance of CeO 2 , such as good ability to disperse active components, structural stability, 25,26 and superior ability to store and release oxygen. 27,28 Among, Pd/CeO 2 catalysts are usually prepared to investigate the catalytic combustion properties of methane. 29,30 However, the low-temperature catalytic activity and thermal stability over the Pd-based catalysts were insufficient in the presence of a large amount of water vapor and carbon dioxide.…”

MnOx dispersed on attapulgite derived Al-SBA-15: a promising catalyst for volatile organic compound combustion

“…[24][25][26][27] During this procedure, the nature and property of the support material signicantly affects the catalytic performance due to the strong metalsupport interaction. 28,29 Mesoporous SBA-15 has been widely considered as one of the most suitable support materials in the catalytic combustion of VOCs, [30][31][32][33] and is dependent on its super high surface area, adjustable pore size from 3 to 30 nm, its ordered pore structure, and its high thermal and hydrothermal stability. However, due to the lack of active sites in the structure, SBA-15 hardly makes a direct contribution to the catalytic activity except for the stabilization and dispersion of the active components.…”