Greening hydrogenation catalysts

Iron nanoparticles

Researchers in Canada and Japan have worked together to develop a novel iron catalyst, which they suggest might make hydrogenation reactions more environment friendly. Hydrogenation reactions are commonly catalyzed using palladium or platinum compounds, but these metals are rare and expensive posing significant economic and environmental problems in obtaining adequate supplies. Iron would make a good substitute as it is abundantly available. But, iron oxidizes. Writing in the journal Green Chemistry, the team from RIKEN and McGill University, have embedded iron-based catalyst nanoparticles in a polymer matrix to protect them from oxygen and water and so preclude their catalyst from rusting. “Our aim is to develop iron-based catalysts not only for hydrogenation but also a variety of organic transformations that can be used in future industrial applications,” explains RIKEN researcher Yoichi Yamada.

New iron catalyst promises green future for hydrogenation

http://www.riken.jp/en/pr/press/2013/20130627_2/

  • Reuben Hudson, Go Hamasaka, Takao Osako, Yochi M. A. Yamada, Chao-Jun Li, Yasuhiro Uozumi, and Audrey Moores. Highly Efficient Iron(0) Nanoparticle-Catalyzed Hydrogenation in Water in Flow, Green Chemistry. doi:10.1039/C3GC40789F

 

 

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Magnetically recyclable magnetite-ceria (Nanocat-Fe-Ce) nanocatalyst – applications in multicomponent reactions under benign conditions

Magnetically recyclable magnetite-ceria (Nanocat-Fe-Ce) nanocatalyst – applications in multicomponent reactions under benign conditions

Green Chem., 2013, Advance Article
DOI: 10.1039/C3GC40375K, Paper
Manoj B. Gawande, Vasco D. B. Bonifacio, Rajender S. Varma, Isabel D. Nogueira, Nenad Bundaleski, C. Amjad A. Ghumman, Orlando M. N. D. Teodoro, Paula S. Branco
Sustainable protocol provides functionalized 1,4-dihydropyrines and tetrahydropyridine using recyclable nano-catalyst.

A novel magnetite nanoparticle-supported ceria catalyst (Nanocat-Fe-Ce) has been successfully prepared by a simple impregnation method and was characterized by XRD, SIMS, FEG-SEM-EDS, and TEM. The exact nature of Nanocat-Fe-Ce was confirmed by X-ray photoelectron spectroscopy and it is noted that CeO2 nanoparticles are supported on magnetite, with evidence of secondary ion mass spectrometry. Catalytic activity of the nano-catalyst was explored for the synthesis of dihydropyridines under benign conditions; a greener protocol is described that provides a simple and efficient method for the synthesis of functionalized 1,4-dihydropyridines using a recyclable nanocatalyst. Notably, 5.22 mol% of the catalyst is sufficient to catalyze the multicomponent reaction in ethanolic medium at room temperature. Importantly, the catalyst could be easily separated from the reaction mixture by using an external magnet and recycled several times without loss of activity.