Highly Active Palladium Nanocatalysts for Low-Temperature Carbon Monoxide Oxidation

Abstract

The noble metal catalysts are most commonly considered to be used in an automobile as a catalytic converter. Palladium (Pd) is a highly active catalyst for carbon monoxide (CO) oxidation in platinum group metals. It is very active for low-temperature CO oxidation if dispersed on suitable metal oxides and composite oxides. The oxidized Pd metal nanocatalyst has been applied more actively than the completely reduced particles. The performance of Pd oxide nanocatalysts strongly depends upon the surface structure, number of active sites and various Pd-O interactions. Palladium is an ideal catalyst not only for the automobile industry through cross-coupling reactions but also for low-temperature catalytic oxidation of CO. The Pd metal is more resistant for sulfur and potassium poisoning, and they are chemically sensitive and degraded rapidly in the presence of fuel impurities. The higher activity of Pd nanocatalyst was attributed to the small particle size and higher dispersion over Pd support. The chemisorptions of CO on Pd catalysts were studied in this review. The results obtained from this study will provide the scientific basis for the future design of Pd-based oxidation catalysts.

Pd@SmMn2O5 as an Efficient Oxygen Reduction Reaction Catalyst via Triggering the Synergistic Effect between Dual Crystal Fields in Mullite

“…However, it is still important to clarify the role of Pd 0 and Pd δ+ (2 < δ < 4) during the ORR. In the process of CO oxidation on the Pd-based catalyst, 40 the PdO catalyst has high activity for CO in situ catalytic oxidation. CO is first adsorbed on the Pd 0 species, and then the adsorbed CO reacts with the Pd 2+ −O species to generate Pd 0 and CO 2 .…”

Nanomaterials in the Automobile Sector

“…Among platinum group metals, palladium (Pd) blended with suitable metal and composite oxides is an effective catalyst for the oxidation of carbon monoxide (CO) at low temperature. Pd metal nanocatalyst is the best possible catalyst for automobile applications [48]. Small particle size and greater dispersibility make the Pd nanocatalyst highly active.…”

“…Structural formation of palladium oxide (PdO) after calcination. The figure has been reproduced with the permission from[48]…”

Insight into the Metal–Support Interaction of Pt and β-MnO2 in CO Oxidation

“…CO is mainly emitted from vehicle combustion and industrial processes [2,3]. It is not only hazardous to human health, but also indirectly contributes to global warming [4]. Catalytic oxidation technology is a considerably effective method for reducing CO emission because it has high economic feasibility, lower cost, and lower secondary pollution generation [5].…”