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Metal Catalysts Recycling and Heterogeneous/Homogeneous Catalysis

Division of Chemical Process Engineering, Faculty of Engineering, Hokkaido University, Hokkaido 060-8628, Japan
Laboratory of Green Chemistry and Process, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, China
Authors to whom correspondence should be addressed.
Academic Editor: Keith Hohn
Catalysts 2015, 5(2), 868-870;
Received: 18 May 2015 / Accepted: 20 May 2015 / Published: 27 May 2015
(This article belongs to the Special Issue Metal Catalysts Recycling and Heterogeneous/Homogeneous Catalysis)
PDF [175 KB, uploaded 27 May 2015]
Note: In lieu of an abstract, this is an excerpt from the first page.


Heterogeneous metal catalysts rather than homogeneous ones are recommended for industrial applications after considering their performance in activity, separation, and recycling [1]. The recycling of metal catalysts is important from economic and environmental points of view. When supported and bulk metal catalysts are used in liquid-phase organic reactions, there is a possibility that active metal species are leaching away into the liquid phases [2,3]. The metal leaching would make it difficult for the catalysts to maintain their desired initial performance for repeated batch reactions and during continuous ones. The metal leaching would also cause some undesired contamination of products by the metal species dissolved in the reaction mixture, and the separation of the metal contaminants would be required to purify the products. Therefore, various novel methods have been proposed so far to immobilize/stabilize the active metal species and to separate/collect/reuse the dissolved metal species [4]. In addition, knowledge on the heterogeneous and homogeneous natures of organic reactions using heterogeneous catalysts is important to discuss their reaction mechanisms and catalytically working active species. [...] View Full-Text
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Arai, M.; Zhao, F. Metal Catalysts Recycling and Heterogeneous/Homogeneous Catalysis. Catalysts 2015, 5, 868-870.

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