Involvement of Surface‐Bound Radicals in the Oxidation of Toluene Using Supported Au‐Pd Nanoparticles

Abstract

All bound up: Au‐Pd nanoparticles having a mean particle size of 3–4 nm and supported on titania (see figure; scale bar 2 nm) exhibit high activity in the selective oxidation of aromatic hydrocarbons using tert‐butyl hydroperoxide as an oxidant. The supported nanoparticles stabilize surface‐bound radicals.

Solvent-free aerobic oxidation of hydrocarbons and alcohols with Pd@N-doped carbon from glucose

“…The selective oxidation of organic compounds, such as alcohols or hydrocarbons, is a primary and essential transformation in organic synthesis and industrial chemistry 1 . Traditionally, various oxidants, such as toxic metal oxides 2 , peroxides (for example, tert-butylhydroperoxide 3 or hydrogen peroxide 4,5 ), halides 6 or ozone 7 , etc., were used for these transformations. Compared with those oxidants, undoubtedly, air is the most ubiquitous, atomeconomical and environmentally benign oxidant.…”

Catalysis using colloidal-supported gold-based nanoparticles

“…Reaction conditions: molar ratio toluene/ TBHP = 1, 80 8C, catalyst (0.2 g), substrate/metal molar ratio = 6,500. Reprinted with permission from reference [35]. Copyright (2012) Wiley-VCH compounds (alcohols, polyols and alkanes) with molecular oxygen, hydrogen peroxide or alkyl hydroperoxides as ''green'' oxidants.…”

“…High conversion of toluene at mild conditions (80°C, atmospheric pressure) was achieved with benzoic acid being the major product ( Fig. 8) [35]. Mechanistic studies were performed in order to elucidate the reaction mechanism, and especially the role of TBHP, and it was found for the first time that surface-bound oxygen-centred radicals play a role in activating toluene, as demonstrated by EPR studies.…”

Synthesis and catalytic properties of bimetallic nanomaterials with various architectures

“…Structure effect Compared to monometallic nanocatalysts, bimetallic nanomaterials show greater potential in catalytic applications due to their enhanced catalytic properties [122][123][124][125]. More importantly, nanocatalysts which consist of two distinct metals allow more flexible design according to the activity/selectivity requirements for a practical reaction.…”