Understanding of the structure activity relationship of PtPd bimetallic catalysts prepared by surface organometallic chemistry and ion exchange during the reaction of iso-butane with hydrogen

Al-Shareef, Reem; Harb, Moussab; Saih, Youssef; Ould‐Chikh, Samy; Roldán, Manuel A.; Anjum, Dalaver H.; Guyonnet, Elodie; Candy, Jean‐Pierre; Jan, Deng-Yang; Abdo, Suheil; Aguilar‐Tapia, Antonio; Proux, Olivier; Hazemann, Jean‐Louis; Basset, Jean‐Marie

doi:10.1016/j.jcat.2018.04.009

Cited by 9 publications

(9 citation statements)

References 103 publications

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“…In contrast to the monometallic system, it is difficult to provide a straightforward explanation for these peaks that are typically observed in PtPd bimetallic systems. [ 47–50 ] This is because PtPt and PtPd bond distances are very similar to each other, as also reported in our fitting results. Nonetheless, it is possible to discuss the atomic coordination from the EXAFS spectrum.…”

Section: Resultssupporting

confidence: 85%

Sacrificial Template‐Assisted Synthesis of Inorganic Nanosheets with High‐Loading Single‐Atom Catalysts: A General Approach

Shin

Park

et al. 2021

Adv Funct Materials

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Single‐atom catalysts (SACs) supported on inorganic materials have attracted much attention in numerous research fields for their high catalytic performance. However, such SACs have been limited by the low metal loading, especially on different types of inorganic supports. Herein, a general approach is presented for preparing SACs on metallic, metal oxide, and perovskite nanosheet (NS) supports to reach a high metal loading of up to 3.94 wt%, by utilizing N‐doped graphene as a sacrificial template that spatially confines the single atoms (SAs). Specifically, the target support material precursors are adsorbed onto the SAs‐stabilized sacrificial template, followed by subsequent heat treatment to transfer the SAs to the support material and to remove the graphene layer. Pt SAs on oxide support exhibits little to no aggregation throughout >10 000 min of annealing at 275 °C, demonstrating high thermal stability, as also supported by ex situ post‐anneal electron microscopy and X‐ray absorption fine structure studies. As a proof‐of‐concept, Pt SACs on SnO2 NSs exhibit high catalytic activity toward chemiresistive sensing of acetone gas (response = 95.4 at 10 ppm, 7.6‐fold enhancement compared with pristine SnO2 NSs) and unprecedented stability under highly humid conditions (27.4% response deterioration at 95% relative humidity).

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Section: Resultssupporting

confidence: 85%

Sacrificial Template‐Assisted Synthesis of Inorganic Nanosheets with High‐Loading Single‐Atom Catalysts: A General Approach

Shin

Park

et al. 2021

Adv Funct Materials

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“…It is worth mentioning that the XAS data of the Pd NPs with particle sizes of around 2 nm was collected under a helium flow to prevent potential oxidations. 43 Interestingly, Figure 1 shows only a minor change of the recycled catalyst C1 compared to the unused catalyst. On the other hand, recycled C2 displays XANES features that resembled those of the Pd NPs.…”

Section: Resultsmentioning

confidence: 95%

“… Ex situ Pd K-edge XANES spectra of unused Pd(II)-AmP-MCF, recycled C1 and C2 , and the Pd NP reference. The Pd NP reference data is taken from ref ( 43 ). …”

Section: Resultsmentioning

confidence: 99%

Investigation of the Deactivation and Reactivation Mechanism of a Heterogeneous Palladium(II) Catalyst in the Cycloisomerization of Acetylenic Acids by In Situ XAS 

et al. 2021

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A well-studied heterogeneous palladium(II) catalyst used for the cycloisomerization of acetylenic acids is known to be susceptible to deactivation through reduction. To gain a deeper understanding of this deactivation process and to enable the design of a reactivation strategy, in situ X-ray absorption spectroscopy (XAS) was used. With this technique, changes in the palladium oxidation state and coordination environment could be studied in close detail, which provided experimental evidence that the deactivation was primarily caused by triethylamine-promoted reduction of palladium(II) to metallic palladium nanoparticles. Furthermore, it was observed that the choice of the acetylenic acid substrate influenced the distribution between palladium(II) and palladium(0) species in the heterogeneous catalyst after the reaction. From the mechanistic insight gained through XAS, an improved catalytic protocol was developed that did not suffer from deactivation and allowed for more efficient recycling of the catalyst.

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“…In our previous report, among various Pt 1 Fe 1– x NC CEs, Pt 1 Fe 9 NC CEs had the best performance rather than Pt 5 Fe 5 NC CEs. This difference could be attributed to the fact that Pd metal also acts as a catalyst toward redox reactions. − As for Pt 1 Pd 1– x , it could be found in various catalysis and reduction reactions that the alloying composition of 50:50 has the best catalytic performance among other compositions. , Therefore, Pd metal may play a role with multiple functions rather than just assisting electron transfer in the Pt-based alloying CEs …”

Section: Resultsmentioning

confidence: 99%

Enhancing the Catalytic Activity of Tri-iodide Reduction by Tuning the Surface Electronic Structure of PtPd Alloy Nanocrystals

Chou¹,

Chou²,

Chen³

et al. 2019

J. Phys. Chem. C

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Understanding of the structure activity relationship of PtPd bimetallic catalysts prepared by surface organometallic chemistry and ion exchange during the reaction of iso-butane with hydrogen

Cited by 9 publications

References 103 publications

Sacrificial Template‐Assisted Synthesis of Inorganic Nanosheets with High‐Loading Single‐Atom Catalysts: A General Approach

Sacrificial Template‐Assisted Synthesis of Inorganic Nanosheets with High‐Loading Single‐Atom Catalysts: A General Approach

Investigation of the Deactivation and Reactivation Mechanism of a Heterogeneous Palladium(II) Catalyst in the Cycloisomerization of Acetylenic Acids by In Situ XAS

Enhancing the Catalytic Activity of Tri-iodide Reduction by Tuning the Surface Electronic Structure of PtPd Alloy Nanocrystals

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