Investigation of the preparation methodologies of Pd-Cu single atom alloy catalysts for selective hydrogenation of acetylene

Cao, Xingjian; Mirjalili, Arash; Wheeler, James R.; Xie, Wentao; Jang, Ben W.‐L.

doi:10.1007/s11705-015-1547-x

Cited by 83 publications

(53 citation statements)

References 19 publications

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“…For the synthesis of palladium catalysts with isolated Pd atoms, one of the promising approaches is the modification of monometallic Pd‐based catalysts with another metal (Ag, Cu, Ga) which leads to an intermetallic structure formation . It was shown that isolation of Pd atoms on the surface of an intermetallic compound enables significantly improved product selectivity and catalyst stability . The presence of a second metal in Pd‐based catalysts is able to reduce the size of Pd nanoparticles and thus to prevent palladium hydride (PdH x ) formation .…”

Section: Hydrogenation Of Propyne With Parahydrogen Over Pd−in/al2o3 mentioning

confidence: 99%

Selective Single‐Site Pd−In Hydrogenation Catalyst for Production of Enhanced Magnetic Resonance Signals using Parahydrogen

Burueva

Kovtunov

Bukhtiyarov

et al. 2018

Chemistry A European J

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Pd-In/Al O single-site catalyst was able to show high selectivity (up to 98 %) in the gas phase semihydrogenation of propyne. Formation of intermetallic Pd-In compound was studied by XPS during reduction of the catalyst. FTIR-CO spectroscopy confirmed single-site nature of the intermetallic Pd-In phase reduced at high temperature. Utilization of Pd-In/Al O in semihydrogenation of propyne with parahydrogen allowed to produce ≈3400-fold NMR signal enhancement for reaction product propene (polarization=9.3 %), demonstrating the large contribution of pairwise hydrogen addition route. Significant signal enhancement as well as the high catalytic activity of the Pd-In catalyst allowed to acquire H MR images of flowing hyperpolarized propene gas selectively for protons in CH, CH and CH groups. This observation is unique and can be easily transferred to the development of a useful MRI technique for an in situ investigation of selective semihydrogenation in catalytic reactors.

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Section: Hydrogenation Of Propyne With Parahydrogen Over Pd−in/al2o3 mentioning

confidence: 99%

Selective Single‐Site Pd−In Hydrogenation Catalyst for Production of Enhanced Magnetic Resonance Signals using Parahydrogen

Burueva

Kovtunov

Bukhtiyarov

et al. 2018

Chemistry A European J

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“…20,21 The dilution of PGM atoms with less active metal atoms not only substantially reduces the use of PGMs but also enables drastic modication of the electronic and geometric structures for enhanced catalysis. 22 For example, the isolation of Pt or Pd with group 11 metals (Au, Ag, and Cu) enables molecular transformations that hardly proceed in the absence of single-atom alloying, such as selective hydrogenation, [23][24][25][26][27] formic acid dehydrogenation, 28 and hydrosilylation. 29 In these systems, the group 11 metals act as inert elements but modify the electronic and geometric factors of the PGM and, thus, its catalytic properties.…”

Section: Introductionmentioning

confidence: 99%

A Cu–Pd single-atom alloy catalyst for highly efficient NO reduction

et al. 2019

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“…Informed by surface chemistry and microscopy studies, a number of different research groups have developed a new generation of PdCu, PdAu, PdAg, RhAu and PtCu SAA nanoparticle catalysts for the selective hydrogenation of acetylene, phenylacetylene, styrene, hexyne and butadiene under realistic reaction conditions as well as Ullmann coupling. 50,[54][55][56][57][58][59][60][61][62][63][64] At low loadings, in situ extended X-ray absorption fine structure and aberration-corrected high angle annular dark field scanning transmission electron microscopy were used to show that Pt exists as individual, isolated atoms substituted into the Cu NP surface both before and after reaction. Nominal amounts of Pt (2 at.…”

mentioning

confidence: 99%

Lonely Atoms with Special Gifts: Breaking Linear Scaling Relationships in Heterogeneous Catalysis with Single-Atom Alloys

Darby

Stamatakis

Michaelides

et al. 2018

J. Phys. Chem. Lett.

240

274

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We discuss a simple yet effective strategy for escaping traditional linear scaling relations in heterogeneous catalysis with highly dilute bimetallic alloys known as single-atom alloys (SAAs). These systems, in which a reactive metal is atomically dispersed in a less reactive host, were first demonstrated with the techniques of surface science to be active and selective for hydrogenation reactions. Informed by these early results, PdCu and PtCu SAA nanoparticle hydrogenation catalysts were shown to work under industrially relevant conditions. To efficiently survey the many potential metal combinations and reactions, simulation is crucial for making predictions about reactivity and guiding experimental focus on the most promising candidate materials. This recent work reveals that the high surface chemical heterogeneity of SAAs can result in significant deviations from Brønsted-Evans-Polanyi scaling relationships for many key reaction steps. These recent insights into SAAs and their ability to break linear scaling relations motivate discovery of novel alloy catalysts.

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Investigation of the preparation methodologies of Pd-Cu single atom alloy catalysts for selective hydrogenation of acetylene

Cited by 83 publications

References 19 publications

Selective Single‐Site Pd−In Hydrogenation Catalyst for Production of Enhanced Magnetic Resonance Signals using Parahydrogen

Selective Single‐Site Pd−In Hydrogenation Catalyst for Production of Enhanced Magnetic Resonance Signals using Parahydrogen

A Cu–Pd single-atom alloy catalyst for highly efficient NO reduction

Lonely Atoms with Special Gifts: Breaking Linear Scaling Relationships in Heterogeneous Catalysis with Single-Atom Alloys

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