PdIn/Al2O3 Intermetallic Catalyst: Structure and Catalytic Characteristics in Selective Hydrogenation of Acetylene

Pd-based bimetallic catalysts for parahydrogen-induced polarization in heterogeneous hydrogenations

“…The Pd-Ag catalyst was extensively characterized in recent work by transmission electron microscopy (TEM), diffuse reflectance Fourier transform infrared spectroscopy of chemisorbed CO (DRIFTS-CO), temperatureprogrammed reduction with H 2 (H 2 -TPR), and hydrogen temperature-programmed desorption (H 2 -TPD) (Rassolov et al, 2020b). The structure of the Pd-In/Al 2 O 3 catalyst was studied in detail by TEM, DRIFTS-CO, and X-ray photoelectron spectroscopy (Burueva et al, 2018;Markov et al, 2019;Mashkovsky et al, 2018).…”

Pd–In intermetallic nanoparticles with high catalytic selectivity for liquid-phase semi-hydrogenation of diphenylacetylene

“…63 It is well known that the position of d-band center with respect to the Fermi level has a significant effect on the catalytic adsorption characteristics. 64 The catalytic properties of the as-prepared PdIn, Pd 3 In and Pd 3 In 7 NPs dispersed in the IL along with the monometallic Pd NPs were tested in the liquid-phase, semi-hydrogenation of DPA. Fig.…”

“…22,42 The impregnated complexes were treated in several steps by calcination at high temperatures (550 °C), followed by H 2 reduction upon 400 °C to obtain particles of the desired intermetallic PdIn phase with high selectivity in gas-and liquid-phase semi-hydrogenation of alkynes. 22,43,44 The stoichiometry was relevant with respect to alkyne semi-hydrogenation. For gas-phase acetylene semihydrogenation, Feng et al demonstrated that intermetallic PdIn NPs with isolated, single-atom Pd sites exhibited higher selectivity than Pd 3 In NPs, which was further supported by density functional theory (DFT) calculations.…”

Local Structure of Pd1 Single Sites on the Surface of PdIn Intermetallic Nanoparticles: A Combined DFT and CO-DRIFTS Study

“…PdIn/Al 2 O 3 (Figure 1) reflexes of PdIn intermetallic phase with cubic structure of the CsCl type were observed at ca. 39.2 • , 56.6 • , and 71.0 • , corresponding to (110) and (211) facets of Pd 1 In 1 (ICSD N • 59473) [29,32,39]. It is important that no peaks characteristic of monometallicPd 0 were observed.…”

“…Note that bridged and threefold hollow-bonded CO adsorption is energetically more favorable than linear CO adsorption on Pd surface [24,25] and usually the signals of multiply coordinated CO tend to prevail in infrared spectra. Therefore, convincing evidence of the formation of Pd 1 single-site surface structure is the complete disappearance of bridged and triple bonded CO adsorption signals and the presence of linearly bonded CO only, suggesting that CO coordination to several Pd atoms is unfavorable [18][19][20][26][27][28][29][30][31][32].…”