Nitrate reduction by maghemite supported Cu-Pd bimetallic catalyst

Pd–Cu interaction in Pd/Cu-MCM-41 catalysts: Effect of silica source and metal content

“…Pd 3d core-level XPS spectra of reduced catalysts show the characteristic doublet attributed to Pd 3d 5/2 and Pd 3d 3/2 in metallic palladium at 335.0-334.9 eV. No differences in BEs are observed among mono-and bimetallic catalysts, in agreement with previous results [17,48]; nevertheless, FWHM values are higher for bimetallic than for monometallic samples, a characteristic that may also be related to the Pd-Cu interaction [47]. Surface Cu/Pd atomic ratio values have been calculated for 4PdCu-sil and 4PdCu-TEOS samples ( Table 2).…”

“…The absence of the hydride decomposition peak for bimetallic samples may be related to the smaller size of Pd-Pd ensembles by Cu dilution. It is known that copper reduction can take place at lower temperatures in bimetallic catalysts, due either to H 2 spillover from Pd 0 to CuO [47][48][49] or to the formation of Pd 1−x Cu x O species [50]. The difference in reduction temperatures among silicate-and TEOS-derived samples may be explained by the Cu content in the Pd 1−x Cu x O mixed oxide as previously reported [51].…”

Influence of magnetic field on the adsorption of organic compound by clays modified with iron

“…A peak centered on 430°C was observed for the modified clays and is also evident for pure hematite (Jung et al, 2012) this can be attributed the transformation shown in Eq. (2).…”

Synthesis of copper on iron/aluminum oxide mesoporous spheres and application on denitrification reaction

“…On the other hand, the reduction of nitrate using metal ions is a promising method for denitrification of water and many studies have been conducted with the aim to develop new selective materials for the reduction of nitrate to nitrogen [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31]. Despite the good results achieved, the use of noble metal-based solids such as Pd and Pt as well as the addition of hydrogen in the reaction medium limit its application in large scale due to the high costs involved [2,18].…”