Design of nanostructured palladium catalyst supported by chitosan/Co3O4 microspheres and investigation of its catalytic behavior against synthesis of benzonitriles.
Designing of eco-friendly, low cost, and thermally stable stabilizing/supporting agents are always desired for production of catalyst systems which provide good catalytic performance in organic reactions. In this study, a novel, green, and efficient stabilizer containing chitosan/Co3O4 microspheres (CS/Co3O4) was developed. Palladium nanoparticles (Pd NPs) were then successfully immobilized on CS/Co3O4 as a heterogeneous nanocatalyst (Pd NPs/CS/Co3O4). Characterization of the designed materials were performed by FT-IR, TEM, FE-SEM, XRD, and EDS and it was determined that Pd NPs formed as approximately 20 nm. Catalytic behavior of Pd NPs/CS/Co3O4 was investigated in the production of different substituted benzonitriles via aryl halide cyanation. Catalytic studies indicate that electron-rich or poor aromatic halides were smoothly cyanated with good reaction yields by Pd NPs/CS/Co3O4 nanocatalyst by using K4[Fe(CN)6] as the cyanating agent. Moreover, it was found that Pd NPs/CS/Co3O4 nanocatalyst provided not only good reaction yields and but also good recovery/reusability for six times in the aryl halide cyanations. This paper displays that Pd NPs/CS/Co3O4 nanocatalyst has a great catalytic and recycling potential for aryl halide cyanations.
Abstract A Cobalt porphyrin conjugated porous polymer (Co/PCP) was obtained by hybrid polymerization of a mixture of Co(II)(5,10,15,20-tetrakis(4-bromophenyl)-21H,23H-porphyrin) (CoTBPP) and 5,10,15,20-tetrakis(4-bromophenyl)-21H,23H-porphyrin (TBPP) (3:7 molar ratio) with the coupling reagent of p-phenyldiboric acid. This Co/PCP was carbonized at 400 °C and the obtained catalyst (denoted as Co3O4@PNC-400) was composed of Co3O4 nanoclusters wrapped in the nitrogen-carbon materials. This catalyst...
#1Yahao Dong(HUST: Huazhong University of Science and Technology)H-Index: 4
#2Jiajun Bi(HUST: Huazhong University of Science and Technology)H-Index: 6
Last. Tao Li(HUST: Huazhong University of Science and Technology)H-Index: 102
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Abstract Chitosan is a versatile polysaccharide in different domains due to facile modification and good biodegradability. In this paper, taking advantage of such functional properties, we have developed a stabilizer agent [OCMCS-SB] produced from chitosan, and palladium was successfully immobilized on this designed stabilizer [OCMCS-SB-Pd(II)]. The obtained complex was illuminated by 13C CP-MAS NMR, FT-IR, TGA, XRD, XPS, SEM, TEM and ICP-OES analyses. Due to the interactions of primary hydroxyl...
#2Xintai Su(SCUT: South China University of Technology)H-Index: 33
Last. Chao Yang(XJU: Xinjiang University)H-Index: 23
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Abstract Nanosized clay minerals have been widely used as efficient supports to immobilize catalyst nanoparticles. However, clay support-induced interactions and their influences on the catalyst structure and performance currently have not been fully understood. Here, Co3O4 nanoparticles supported on halloysite nanotubes (HNTs) were synthesized by a facile deposition-precipitation approach followed by thermal treatment. A series of characterization methods were employed for the Co3O4/HNTs hybrid...
Last. Rajender S. Varma(EPA: United States Environmental Protection Agency)H-Index: 113
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Abstract Natural biopolymers, polymeric organic molecules produced by living organisms and/or renewable resources, are considered greener, sustainable, and eco-friendly materials. Natural polysaccharides comprising cellulose, chitin/chitosan, starch, gum, alginate, and pectin produce sustainable materials owing to their outstanding structural features, abundant availability, and nontoxicity, ease of modification, biocompatibility, and application potential. Plentiful polysaccharides have been ut...
Last. Hojat Veisi(PNU: Payame Noor University)H-Index: 55
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Abstract In this current work, a bio-inspired green approach has been followed to synthesize Ag nanoparticles (NPs), which were immobilized over reduced graphene oxide (rGO) as a suitable support. In the stepwise preparation of the bionanocomposite (rGO/Ag NPs) by using Menthapulegium flower extract, initially graphene oxide (GO) was reduced to rGO followed by in situ reduction of Ag+ ions to Ag NPs. In these reductions, different biomolecules such as, polyphenols, flavonoids, alkaloids, terpeno...
#1Yahao Dong(HUST: Huazhong University of Science and Technology)H-Index: 4
#2Jiajun Bi(HUST: Huazhong University of Science and Technology)H-Index: 6
Last. Tao Li(HUST: Huazhong University of Science and Technology)H-Index: 102
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Abstract Bearing an intrinsic green nature, biopolymers are expected to serve as ideal alternatives in the sustainable conversion process. In this paper, a N-Heterocyclic carbene functionalized hydroxyethyl cellulose supported palladium catalyst (HEC-NHC-Pd) has been successfully prepared through a surface functionalization approach. The as-prepared catalyst was characterized through TEM, CP/MAS 13C-NMR, and XPS analyses, etc. The new and eco-friendly catalyst was effectively employed in Suzuki ...
#2Jaideep Malik(IITR: Indian Institute of Technology Roorkee)H-Index: 4
Last. Rita Kakkar(DU: University of Delhi)H-Index: 22
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Abstract The biotemplate assisted synthesis route is environmentally friendly, cost effective and easy. It employs a biomaterial like fruit waste, vegetable waste, bio-macromolecule, etc. for attaining a specific morphology of the as-synthesized product. Herein, we report the novel synthesis of magnetic, coral-reef like spinel-Co3O4 nanoparticles (m-Co3O4 NPs) by the immersion-calcination technique using peanut peel as a biotemplate. The as-synthesized material has been characterized by powder X...
Abstract Pd(0) nanoparticles stabilized over polydopamine (PDA) capped magnetic GO/Fe3O4 nanocomposites (GO/Fe3O4@PDA/Pd) have been synthesized in variable Pd load following a post grafting approach. Pd has been reduced in situ by the functionalized PDA avoiding the use of external harsh reductant. The structural properties of the synthesized materials were studied by different analytical techniques like Field Emission Scanning electron microscopy (FESEM), Energy Dispersive X-ray Spectroscopy (E...
Abstract Exploitation of polymers as effective starting materials to produce various valuable catalysts is attracting the attention of industrial and academic researchers. Moreover, among all polymers, natural polysaccharides such as cellulose, starch, alginate, gum, pectin, chitin and chitosan have drawn the most attention in recent years due to their unique structural features and important potential applications. A lot of studies have been performed on the synthesis of polysaccharide based (n...
Abstract This work reports i) green synthesis of palladium nanoparticles (Pd NPs) on the developed biodegradable microbeads as stabilizers, featuring chitosan, agarose and beta-cyclodextrin, ii) investigation of the catalytic role of the Pd NPs prepared in the Suzuki-Miyaura and iii) cyanation reactions. Pd NPs@microcapsules (CAP) convert a series of aryl halides to biphenyl compounds with yields ranging from 80 to 98%. Pd NPs@CAP is highly active in the cyanation of different aryl bromides and ...