Platinum-Ruthenium Nanoparticles: Active and Selective Catalysts for Hydrogenation of Phenylacetylene

Abstract

Bimetallic metal nanoparticles are often more catalytically active than their monometallic counterparts, due to a so-called ‘synergistic effect’. Atomically precise ruthenium-platinum clusters have been shown to be active in the hydrogenation of phenylacetylene to styrene (a reaction of importance to the polymer industry). However, the synthesis of these clusters is generally complex, and cannot be modified to produce clusters with differing metal compositions or ratios. Hence, any truly systematic study of compositional effects using such clusters is hindered by the inaccessibility of certain metal ratios. In this study, a series of larger bimetallic ruthenium-platinum colloids of varying metal ratios was synthesised in solution and immobilised on silica. Catalytic activity was evaluated by hydrogenation of phenylacetylene to styrene. Both bimetallic and monometallic colloids were active catalysts for the hydrogenation of phenylacetylene to styrene and further to ethylbenzene. Of those studied, a catalyst composed of 73 % platinum-27 % ruthenium (by moles) showed the highest activity. This suggests that synergistic effects play an important role in the catalysis of this reaction. To our knowledge this is the first systematic study of ruthenium-platinum nanoparticle catalytic activity on this reaction.

3D Ruthenium Nanoparticle Covalent Assemblies from Polymantane Ligands for Confined Catalysis

“…The hydrogenation of phenylacetylene in the liquid phase is a benchmark method for assessing the catalytic activity and selectivity of Pd NPs . Although there is a need for selective hydrogenation catalysts that are less expensive than conventional Pd-based catalysts, Ru NPs have been little studied. − For this reaction, the catalytic properties of the transition metal strongly depend on its electronic structure. The catalytic behavior of Ru NPs prepared with the different polymantane ligands was studied in the hydrogenation of phenylacetylene into styrene at room temperature and a constant H 2 pressure of 5 bar (Table , entries 1–11).…”

Seed-mediated synthesis of bimetallic ruthenium–platinum nanoparticles efficient in cinnamaldehyde selective hydrogenation

“…2 Bimetallic RuPt NPs are mainly used in catalysis for methanol 3,4 and ethanol 5 electrooxidation in fuel cells, for CO preferential oxidation 6 and for selective hydrogenation. [7][8][9] In all cases, control over the shape and chemical order is crucial, since it will impact NP properties. 1 Although the control over the chemical order is well documented for large NPs (>5 nm), for the smaller ones, it is much more difficult to achieve.…”

Acceleration of the semi-hydrogenation of alkynes over an N-doped porous carbon sphere-confined ultrafine PdCu bimetallic nanoparticle catalyst

“…Compared with those of the reported representative catalysts (Table S1, ESI †), the TOF value of Pd 1.73 Cu 1.66 /NPCNs was greater than those of Pd-NPs@ZIF-8, 33 PtRu/PVP, 34 and Fe 3 O 4 @ SiO 2 (c,80)/PdZn 0.6 . 35 And the reaction conditions of the Pd 1.73 Cu 1.66 /NPCNs catalyst for semi-hydrogenation of phenylacetylene are milder.…”

“…Notably, the turnover frequency (TOF) for the selective hydrogenation of phenylacetylene reached 419.1 h −1 ; this value is superior to those of the precious-metal based catalysts reported previously. 33–35 Therefore, this study may provide a general strategy on heteroatom-doped mesoporous carbon-supported bimetallic catalysts for the semi-hydrogenation of alkynes with high performance.…”