High catalytic activity and stability of palladium nanoparticles prepared by the laser electrodispersion method in chlorobenzene hydrodechlorination

Laser electrodispersion as a new chlorine-free method for the production of highly effective metal-containing supported catalysts

“…This result is in good agreement with the data reported in [7], where the stability of the LED particles toward oxidation was explained by an amorphous state of the metal and a small size of the metal nanoparticles.…”

“…According to the XPS results, which are presented in more detail in the previous work [7], the Pd 3d 5/2 peak position (336.1 eV) and the corresponding line shape confirm that only Pd(0) is presented in Pd/C prepared by LED after its brief activation in H 2 (150 °C, 30 min). When comparing the XPS spectra of Pd/C and Pd/Al 2 O 3 ( Fig.…”

“…Pd nanoparticles in these samples (with different Pd loading, see samples Pd/C-1 to Pd/C-4 in Table 1) are also very resistant to air oxidation. The TEM images of such catalysts are presented elsewhere [7]; very narrow particle size distribution with a mean size of about 2.1 nm was found for Pd/C with Pd loading in the range 1.1 × 10 -4 to 3 × 10 -3 % mass. Thus, the alumina-supported catalysts have a characteristic feature that distinguishes them from the carbon-supported LED systems, i.e, a higher oxidation degree of Ni owing to the Ni-support interaction.…”

“…LED catalysts are of core-shell type [7] with very low metal content, as illustrated in Table 1. For this reason, after crashing the catalyst granules it would be hardly possible to observe the metal nanoparticles by HRTEM.…”

“…Detailed investigation of such systems for Pd, Ni, and Cu deposited onto flat (Si, SiO 2 /Si, C) and granulated (artificial carbon support Sibunit) supports was performed in a series of works [6][7][8][9]. The results can be summarized as follows:…”