RT journal article
T1 Synthesis of palladium-rhodium bimetallic nanoparticles for formic acid dehydrogenation
A1 Barlocco, Ilaria
A1 Capelli, Sofia
A1 Zanella, Elisa
A1 Chen, Xiaowei
A1 Delgado Jaén, Juan José
A1 Roldan, Alberto
A1 Dimitratos, Nikolaos
A1 Villa, Alberto
A2 Ciencia de los Materiales e Ingeniería Metalúrgica y Química Inorgánica
K1 Palladium
K1 Rhodium
K1 Alloy
K1 Formic acid
K1 Hydrogen
K1 Muconic acid
AB Herein, we report for the first time the synthesis of preformed bimetallic Pd-Rh nanoparticles with dif- ferent Pd:Rh ratios (nominal molar ratio: 80–20, 60–40, 40–60, 20–80) and the corresponding Pd and Rh monometallic ones by sol immobilization using polyvinyl alcohol (PVA) as protecting agent and NaBH 4 as reducing agent, using carbon nanofibers with high graphitization degree (HHT) as the desired support. The synthesized catalysts were characterized by means of Transmission Electron Microscopy (TEM) and inductively coupled plasma optical emission spectroscopy (ICP - OES). TEM shows that the average particle size of the Pd-Rh nanoparticles is the range of 3–4 nm, with the presence of few large agglomerated nanoparticles. For bimetallic catalysts, EDX-STEM analysis of individual nanoparticles demonstrated the presence of random-alloyed nanoparticles even in all cases Rh content is lower than the nominal one (calculated Pd:Rh molar ratio: 90–10, 69–31, 49–51, 40–60). The catalytic performance of the Pd-Rh cat- alysts was evaluated in the liquid phase dehydrogenation of formic acid to H 2 . It was found that Pd-Rh molar ratio strongly influences the catalytic performance. Pd-rich catalysts were more active than Rh-rich ones, with the highest activity observed for Pd 90 :Rh 10 (1792 h −1 ), whereas Pd 69 :Rh 31 (921 h −1 ) resulted the most stable during recycling tests. Finally, Pd 90 :Rh 10 was chosen as a representative sample for the liquid-phase hydrogenation of muconic acid using formic acid as hydrogen donor, showing good yield to adipic acid.
PB Elsevier
SN 2096-885X
YR 2021
FD 2021
LK http://hdl.handle.net/10498/30901
UL http://hdl.handle.net/10498/30901
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 13-nov-2026