Selective C=C Hydrogenation of Unsaturated Hydrocarbons in Neat Water Over Stabilized Palladium Nanoparticles Via Supported 12-Tungstophosphoric Acid

Pd single-atom-site stabilized by supported phosphomolybdic acid: design, characterizations and tandem Suzuki–Miyaura cross coupling/nitro hydrogenation reaction

“…The BET surface area of ZrO 2 was found to be 170 m 2 g À1 . [53][54][55][56] As expected, a signicantly higher surface area was obtained in case of PMA/ZrO 2 (204 m 2 g À1 ) due to the strong interaction between PMA and ZrO 2 .…”

“…In step 1, hydrous zirconia (ZrO 2 ) was synthesized using the previously reported method by our group. [53][54][55] In step 2, PMA was supported on ZrO 2 via the incipient wet impregnation method, as previously reported by us. 56 In step 3, Pd-exchanged ZrO 2 -supported phosphomolybdic acid (Pd-PMA/ZrO 2 ) was synthesized by exchanging the available protons of PMA with palladium.…”

“…56 In step 3, Pd-exchanged ZrO 2 -supported phosphomolybdic acid (Pd-PMA/ZrO 2 ) was synthesized by exchanging the available protons of PMA with palladium. [53][54][55][56] For the reduction of Pd(II) to Pd(0), the resulting wood-brown-colored material was charged in a Parr reactor under ambient conditions. The obtained grey-colored material was designated as Pd-PMA/ZrO 2 .…”

“…2a, ZrO 2 shows bands in the region of 1600 and 1370 cm À1 , corresponding to H-O-H and O-H-O bending, respectively, and a broad band at 600 cm À1 , corresponding to Zr-O-H bending. [53][54][55][56] PMA show (Fig. 2b) four characteristic bands of the Keggin unit at 1060, 965, 870 and 790 cm À1 , corresponding to the central P-O, terminal Mo]O, and corner-shared and edge-shared Mo-O-Mo stretching, respectively.…”

Synthesis and characterization of supported stabilized palladium nanoparticles for selective hydrogenation in water at low temperature

“…Liquid-phase selective hydrogenation is a diverse and versatile acceptable route to synthesize precursors for various intermediates and still it is fascinating and challenging field. 12 In this regards, triethanolamine, 13 isopropanol 14 and oxalic acid 15 etc. , are generally used as electron and proton donors for hydrogenation, which makes the process less sustainable.…”