Catalytic activity of Pd/Al2O3 toward the combustion of methane

Enhanced hydrothermal stability of high performance lean fuel combustion alumina-supported palladium catalyst modified by nickel

“…In our work, a part of PdO particles on supports were firstly reduced by H 2 into palladium particles at the high-temperature, thus the Pd-PdO formed on the substrate served as the active component [24,34,48]. CH 4 diffused and chemisorbed on the surface of the catalyst, whereafter it dissociated and was oxidized to CO 2 and H 2 O.…”

“…Suitable support has to be resistant to the high temperature application and it has to maintain the metal dispersion of the catalyst during operation. Among many catalysts, the aluminasupported palladium catalysts are renowned for their high activity in methane combustion under lean-burn conditions [23][24][25]. However, the thermal stability of the catalyst is a limiting factor in this application, especially when additional water vapor is included in the feed stream [12][13][14]26,27].…”

An Experimental and Kinetic Modelling Study for Methane Oxidation over Pd-based Catalyst: Inhibition by Water

“…However, the catalytic activity of these systems is decreasing with time-on-stream and significant research has been addressed to understand the mechanism of Pdbased catalyst deactivation during the methane oxidation. The water inhibition effect has been discussed extensively [4][5][6][7][8][9][10][11][12][13][14][15] and the formation of surface hydroxyls is considered to be a key deactivation pathway, which results in the slow deactivation of the catalyst due to the continuous formation and accumulation of these surface species [8,16]. Moreover, it was shown that competitive adsorption between methane and water molecules plays a role in the catalytic activity loss [5,9,15,17,18].…”

Methanol total oxidation as model reaction for the effects of different Pd content on Pd-Pt/CeO2-Al2O3-TiO2 catalysts

“…7. After fitting, the peak of Pd 3d 5/2 was decomposed into single one around 336.4 eV which was attributed to Pd 2+ [32][33][34] over all the catalysts. The peak of Al overlapped with Pt and the content of Pt was much less than the Al possessed which resulted in the Pt did not appear separately [35].…”