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Synthesis of Highly Active Pd Nanoparticles Supported Iron Oxide Catalyst for Selective Hydrogenation and Cross‐Coupling Reactions in Aqueous Medium
Author(s) -
Shukla Astha,
Singha Rajib K.,
Sasaki Takehiko,
Prasad Vemulapalli V. D. N.,
Bal Rajaram
Publication year - 2019
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201900358
Subject(s) - catalysis , palladium , materials science , inorganic chemistry , oxide , nanoparticle , metal , reducing agent , particle size , coupling reaction , triethanolamine , nuclear chemistry , chemistry , organic chemistry , nanotechnology , analytical chemistry (journal) , metallurgy
Post synthetic approach was successfully employed for the synthesis of Pd supported iron oxide (Pd‐Fe 2 O 3 TA ) catalyst using polyvinylpyrrolidone as capping agent and triethanolamine as reducing agent. Performance of Pd‐Fe 2 O 3 TA catalyst was investigated for selective hydrogenation of nitro compounds and Suzuki coupling reactions. Prepared catalyst exhibited excellent yield of corresponding substituted amines and biphenyls, under optimized reaction conditions. Different analytical techniques such as BET‐surface area measurements, XRD, ICP‐AES, SEM, TEM, XPS, TPR, FT‐IR, RAMAN, UV‐Vis and EXAFS analysis were employed to characterize the catalyst. Average particle size of palladium nanoparticles (NPs) was found to be ∼5.2 nm supported on 60–120 nm size of iron oxide nanocrystals. Various reaction parameters such as time, temperature, solvents, active metal loading, base and different substituent were investigated in detail. Different catalysts were also prepared and compared their activity with that of Pd‐Fe 2 O 3 TA catalyst. Experimental observations revealed that size of palladium NPs and metal‐support interaction favoured the superior activity of Pd‐Fe 2 O 3 TA catalyst compared to other catalysts. Stability of Pd‐Fe 2 O 3 TA catalyst was confirmed by its recyclability tests indicated true heterogeneous nature of catalyst.