Improved Pd-on-Au bimetallic nanoparticle catalysts for aqueous-phase trichloroethene hydrodechlorination

Nutt, Michael O.; Heck, Kimberly N.; Alvarez, Pedro J. J.; Wong, Michael S.

doi:10.1016/j.apcatb.2006.06.005

Cited by 261 publications

(168 citation statements)

References 68 publications

Supporting

Mentioning

158

Contrasting

Unclassified

Order By: Relevance

“…Bimetallic particles of same size, shape, and composition show significant differences in activity when configured into different architectures such as alloy, cluster in cluster, core-shell or monometallic mixtures. The structure of bimetallic combination depends on the preparation conditions, miscibility and the kinetics of the reduction of metal ions on the surface of the catalyst [206][207][208][209][210]. Au/Pt-TiO 2 obtained by the hydrolysis of titanium isopropoxide in microemulsion system followed by reduction of HAuCl 4 (precursor for gold) and K 2 PtCl 4 (precursor for palladium) along with NaBH 4 for the bimetallic deposition and the catalyst was further calcined at 450 • C. This catalyst exhibited high rates for phenol degradation under visible light irradiation [210].…”

Section: Photocatalytic Activity Of Titania With Bimetallic Surface Dmentioning

confidence: 99%

A review on plasmonic metal⿿TiO2 composite for generation, trapping, storing and dynamic vectorial transfer of photogenerated electrons across the Schottky junction in a photocatalytic system

Devi

Kavitha

2016

Applied Surface Science

318

View full text Add to dashboard Cite

Section: Photocatalytic Activity Of Titania With Bimetallic Surface Dmentioning

confidence: 99%

A review on plasmonic metal⿿TiO2 composite for generation, trapping, storing and dynamic vectorial transfer of photogenerated electrons across the Schottky junction in a photocatalytic system

Devi

Kavitha

2016

Applied Surface Science

318

View full text Add to dashboard Cite

“…The synthesis of pure Pd NPs (~4 nm) has been reported in detail. [2] Briefly, Pd NPs were synthesized using an experimental protocol similar to the Au NPs except that a 0. Monitoring of the 4-NL reduction reaction was started 30 s after NP injection using UVvis spectroscopy, in which the absorbance of the 4-NL nitro group at λ=400 nm (red-shifted from ~313 nm due to basic reaction conditions) was measured.…”

Section: Pd Np Synthesismentioning

confidence: 99%

Improving gold catalysis of nitroarene reduction with surface Pd

et al. 2016

Self Cite

View full text Add to dashboard Cite

Nitroarene reduction reactions are commercialized catalytic processes that play a key role in the synthesis of many products including medicines, rubbers, dyes, and herbicides. Whereas bimetallic compositions have been studied, a better understanding of the bimetallic structure effects may lead to improved industrial catalysts. In this work, the influence of surface palladium atoms supported on 3-nm Au nanoparticles (Pd-on-Au NPs) on catalytic activity for 4-nitrophenol reduction is explored. Batch reactor studies indicate Pd-on-Au NPs exhibit maximum catalytic activity at a Pd surface coverage of 150 sc%, with an initial turnover frequency of ~3.7 mol-nitrophenol/mol-metal surface /s, which was ~5.5× and ~13× more active than pure Au NPs and Pd NPs, respectively. Pd NPs, Au NPs, and Pd-on-Au NPs below 175 sc% show compensation behavior. Three-dimensional Pd surface ensembles (with ~4-5 atoms) previously identified through x-ray adsorption spectroscopy provide the active sites responsible for the catalytic maximum. These results demonstrate the ability to adjust systematically a structural feature (i.e., Pd surface coverage) to yield a more active material.

show abstract

“…Lee et al reported a simple onepot aqueous synthetic method for preparing rhombic dodecahedral Au-Pd alloy nanocrystals enclosed exclusively by 12 (110) facets (Figure 20 ), which exhibited higher electrocatalytic activities than (111)-faceted nanoparticles [90] . Wong and coworkers reported high activity of Pd-on-Au bi-metallic nanocatalysts (with only submonolayer Pd coverages) compared to monometallic Pd catalysts for hydrodechlorination of trichloroethene [91] , with catalytic activity being two orders of magnitude greater than Pd black (on a Pd atom basis). In this system, apart from the synergistic effect, gold was also found to improve oxidation of the catalyst and deactivation resistance to chloride and sulfi de species, a common problem for Pd-based catalysis [91] .…”

Section: Bi-and Multi-metallic Nanoparticles For Catalysismentioning

confidence: 99%

“…Wong and coworkers reported high activity of Pd-on-Au bi-metallic nanocatalysts (with only submonolayer Pd coverages) compared to monometallic Pd catalysts for hydrodechlorination of trichloroethene [91] , with catalytic activity being two orders of magnitude greater than Pd black (on a Pd atom basis). In this system, apart from the synergistic effect, gold was also found to improve oxidation of the catalyst and deactivation resistance to chloride and sulfi de species, a common problem for Pd-based catalysis [91] .…”

Section: Bi-and Multi-metallic Nanoparticles For Catalysismentioning

confidence: 99%

The impacts of nanotechnology on catalysis by precious metal nanoparticles

Jin

2012

Nanotechnology Reviews

140

View full text Add to dashboard Cite

This review article focuses on the impacts of recent advances in solution phase precious metal nanoparticles on heterogeneous catalysis. Conventional nanometal catalysts suffer from size polydispersity. The advent of nanotechnology has signifi cantly advanced the techniques for preparing uniform nanoparticles, especially in solution phase synthesis of precious metal nanoparticles with excellent control over size, shape, composition and morphology, which have opened up new opportunities for catalysis. This review summarizes some recent catalytic research by using well-defi ned nanoparticles, including shape-controlled nanoparticles, high index-faceted polyhedral nanocrystals, nanostructures of different morphology (e.g., coreshell, hollow, etc.), bi-and multi-metallic nanoparticles, as well as atomically precise nanoclusters. Such well-defi ned nanocatalysts provide many exciting opportunities, such as identifying the types of active surface atoms (e.g., corner and edge atoms) in catalysis, the effect of surface facets on catalytic performance, and obtaining insight into the effects of size-induced electron energy quantization in ultra-small metal nanoparticles on catalysis. With well-defi ned metal nanocatalysts, many fundamentally important issues are expected to be understood much deeper in future research, such as the nature of the catalytic active sites, the metalsupport interactions, the effect of surface atom arrangement, and the atomic origins of the structure-activity and the structure-selectivity relationships.

show abstract

Improved Pd-on-Au bimetallic nanoparticle catalysts for aqueous-phase trichloroethene hydrodechlorination

Cited by 261 publications

References 68 publications

A review on plasmonic metal⿿TiO2 composite for generation, trapping, storing and dynamic vectorial transfer of photogenerated electrons across the Schottky junction in a photocatalytic system

A review on plasmonic metal⿿TiO2 composite for generation, trapping, storing and dynamic vectorial transfer of photogenerated electrons across the Schottky junction in a photocatalytic system

Improving gold catalysis of nitroarene reduction with surface Pd

The impacts of nanotechnology on catalysis by precious metal nanoparticles

Contact Info

Product

Resources

About