Catalytic Oxidation of CO to CO₂ over CeO₂-Supported Pd–Cu Catalysts under Dilute O₂ Conditions

Abstract

Catalytic CO oxidation processes under dilute oxygen conditions are key industrial and environmental processes. CeO2-supported Pd and Pd–Cu catalysts (Pd/CeO2 and Pd–Cu/CeO2) were prepared by impregnation, and the effect of Cu addition on the catalytic properties of CO oxidation was investigated under CO/O2 stoichiometric conditions. The activity of Pd/CeO2 was superior to that of Pd/TiO2 and Pd/Al2O3 at low temperatures. The Cu addition to Pd/CeO2 with a Cu/Pd molar ratio of approximately 1–5 enhanced the CO oxidation activity. Small PdO particles were distributed over the CeO2 surfaces, and Cu addition decreased the size of the Pd particles on the CeO2 and increased the fraction of highly reactive Pd sites. As the Cu/Pd mole fraction in the Pd–Cu/CeO2 catalyst increased to 10, the PdO on CeO2 agglomerated significantly, and the CO oxidation activity decreased.

Ultra-Small Pt–Ni Bimetallic Nanoparticles Confined in Dendritic Mesoporous Silica with Remarkable CO Catalytic Oxidation Performance

“…CO is a harmful gas pollutant and can cause varying degrees of poisoning symptoms and endanger human health, reducing CO emissions is a pressing concern. ,, Therefore, in this work, the catalytic activity of 1% Pt x Ni 1– x /KCC-1 catalysts was examined by utilizing CO oxidation as the probe reaction. The results are given in Figure A, it can be seen that the 1% Pt/KCC-1 catalyst became active at around 100 °C, and the CO could be completely converted ( T 100 ) at 160 °C.…”

“…Noble metal nanomaterials have received great attention and have been widely studied for decades due to their excellent performance as catalysts in the chemical industry, environmental protection, and energy production. − Currently, a crucial task and a popular research field are how to construct and synthesize satisfactory catalysts with lower noble metal loadings, given the limited supply and high price of noble metals . One promising and feasible route to achieve this goal is to prepare bimetallic catalysts containing both the noble metal and transition metal, in which the transition metal not only decreases the amount of noble metal but also improves its catalytic performance.…”