Catalytic application of silver nanoparticles immobilized to rice husk-SiO2-aminopropylsilane composite as recyclable catalyst in the aqueous reduction of nitroarenes

Noncovalently functionalized carbon nanotubes immobilized Fe–Bi bimetallic oxides as a heterogeneous nanocatalyst for reduction of nitroaromatics

“…But after that, we detected the decline of the reduction yield with pCNT-CHIT-xFe 2 O 3 · yBi 2 O 3 . These results agreed with the batch recycles, in which the catalyst pCNT-CHIT-xFe 2 O 3 ·yBi 2 O 3 Table 2 Chemoselective reduction of various nitroarenes to anilines with hydrazine hydrate over the nano oCNT-CHIT-xFe 2 can be used for more than ten runs without any loss of activity. It could be deemed that the oxidized CNT was a better carrier than the pristine CNT for the reason that the existence of -COOH group on the surface of CNT which can enhance the stability of the catalyst centre or the exist of -CO on the surface of the CNT improve catalytic activity as previous reported [59].…”

“…Aromatic amines are industrially important intermediates for producing of pharmaceuticals [1], agrochemicals [2], dyes [3], and functional polymers products [4,5]. The chemoselective reduction of nitroarenes to corresponding anilines are significant protocols.…”

Silver nanoparticles immobilized onto poly(4‐vinylpyridine)‐functionalized magnetic nanoparticles: A robust magnetically recyclable catalyst for oxidant‐free alcohol dehydrogenation

“…Peaks at 553 cm −1 (Figure a) and 1980 cm −1 (Figure b) are related to stretching vibrations of FeO and SiO bonds, respectively, which confirm the formation of Fe 3 O 4 and Fe 3 O 4 @SiO 2 structures . The band at 820 cm −1 is related to the deformation of SiO bond . Bond formation between Fe 3 O 4 @SiO 2 and (3‐mercaptopropyl)trimethoxysilane (MPTMS) is proved by CH stretching vibrations at 2850 and 2927 cm −1 .…”

Catalytic application of 1,3,5-triazine-pentaethylenehexamine polymer-supported palladium nanoparticles in the convenient reduction of nitroarenes with sodium borohydride or hydrazine

“…5 In order to overcome these problems, researchers try to develop more economical, easily available, and environmentally friendly methods for the synthesis of primary amines with high yield and minimum waste products. 6,7 One of the most popular methods in the last decades is the reduction of nitro groups by using the combinations of a hydrogen source such as NaBH 4 and N 2 H 4 with transition metals. Since the 1960s many catalysts working very quickly and at high efficiency under moderate conditions have been developed and considered practical in the reduction of nitro compounds.…”