Biphasic catalysis using amphiphilic polyphenols-chelated noble metals as highly active and selective catalysts

Abstract

In the field of catalysis, it is highly desired to develop novel catalysts that combine the advantages of both homogeneous and heterogeneous catalysts. Here we disclose that the use of plant pholyphenol as amphiphilic large molecule ligand/stabilizer allows for the preparation of noble metal complex and noble metal nanoparticle catalysts. These catalysts are found to be highly selective and active in aqueous-organic biphasic catalysis of cinnamaldehyde and quinoline, and can be reused at least 3 times without significant loss of activity. Moreover, the catalytic activity and reusability of the catalysts can be rationally controlled by simply adjusting the content of polyphenols in the catalysts. Our strategy may be extended to design a wide range of aqueous-organic biphasic catalysis system.

Process optimization for biosynthesis of mono and bimetallic alloy nanoparticle catalysts for degradation of dyes in individual and ternary mixture

“…Particularly in the catalytic reaction process, bimetallic NPs often exhibit higher catalytic activity and selectivity than their monometallic counterparts 9 . Though, the recovery and reusability of the homogeneous catalysts is extremely difficult and often requires tedious process 1,4,10 . Apparently, there is an acute need for developing a new type of catalyst that process high efficiency and reusability.…”

Aqueous phase homogeneous catalysis using core–shell nanoreactors: Application to rhodium-catalyzed hydroformylation of 1-octene

“…A few examples of unimolecular macrostructures that achieve a favorable environment for efficient catalysis in water are available in the open literature, yet with various architectures http://dx.doi.org/10.1016/j.jcat.2015.01.009 and levels of complexity. Using natural polyphenols as amphiphilic ligands, Mao et al [14] could prepare noble metal complex and noble metal nanoparticle catalysts for the biphasic hydrogenation of cinnamaldehyde and quinoline. The authors observed some decrease of conversion upon recycling, whose extent depended on the content of polyphenols: from 61% to 97% of the original activity was retained after five runs.…”

Artificial photosynthesis of oxalate and oxalate-based polymer by a photovoltaic reactor

“…The peak at δ 8.544, noted as H b , not connected with any C atoms ( S. Fig. 6 ), but in the range of active H, is assigned to OH group 13 16 17 . The peak at δ 3.892, noted as H c , connected with C atoms at δ 71.80, is assigned to CH group ( S. Fig.…”