Copper Oxide–Platinum/Alumina Catalysts for Volatile Organic Compound and Carbon Monoxide Oxidation: Synergetic Effect of Cerium and Lanthanum

Characterization and catalytic performances of La doped Pd/CeO2 catalysts for methanol decomposition

“…The accurate evaluation of the position of the main reflections of CeO 2 corresponding to the (2 0 0), (2 2 0), (3 1 1), (4 0 0), (3 3 1) and (4 2 0) crystallographic planes in La-modified Pd/CeO 2 catalysts showed a 2θ shift toward lower angles in the range of 0.04-0.10 • with respect to the positions of the same peaks in the Pd/CeO 2 catalyst (see Table 2). Similar results have been reported by other groups [8,9]. This is probably due to the formation of ceria-lanthana solid solution caused by dissolution of the La 3+ ions into the CeO 2 lattice, since, the radius of La 3+ ion (1.19 Å) is larger than that of the Ce 4+ ion (1.09 Å).…”

Supported binary CuOx–Pt catalysts with high activity and thermal stability for the combustion of NH3 as a carbon-free energy source

“…Finally, it is probable that the additive and co-existing Pt also accelerates the formation of CuAl 2 O 4 as well as the phase transition to a-Al 2 O 3 . Although no concrete data are available, a similar signicant decrease of the specic surface area could be observed in both Cu-Al-O and Cu-Pt-Al-O system catalysts aer thermal aging occurred at 1000 C. 19 Notably, the high performance for CuO x /Pt/Al 2 O 3 was maintained aer thermal aging at 1000 C despite the phase transition (g / a) and decrease in the surface area. On the other hand, CuO x /Pt supported on a-Al 2 O 3 exhibited slightly higher N 2 O/NO selectivities compared to CuO x /Pt/Al 2 O 3 (using g-Al 2 O 3 ), the results of which can be explained from the difference in the CuO x phase of CuO in CuO x /Pt/a-Al 2 O 3 and CuAl 2 O 4 in CuO x /Pt/g-Al 2 O 3 .…”

Novel application of depleted fullerene soot (DFS) as support of catalysts for low-temperature reduction of NO with CO

“…Depending on the supported active phase, the temperature and the conditions of NO reduction, these catalytic active complexes are reduced or oxidized. The presence of bivalent catalytic sites playing the role of donor-acceptor pairs is a well-recognized requirement for the activity of oxide catalysts in different red-ox reactions [36,37]. It was previously established for the unsupported Cu x Co 3−x O 4 catalysts that the formation of (Cu 2+ -Co 3+ ) ion pairs plays a decisive role for the activity of catalysts towards NO + CO [11].…”