Regulating the Catalytic Activity of Pd Nanoparticles by Confinement in Ordered Mesoporous Supports

Naik, Pranjali; Chatterjee, Puranjan; Chen, Shaojiang; Huang, Wenyu; Slowing, Igor I.

doi:10.1002/cctc.202001594

Cited by 10 publications

(6 citation statements)

References 71 publications

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“…adjusted. Thus, introducing mesopores into Y zeolites allows the structure of the Pt nanoparticles to be controlled, as reported in previous studies [28,[32][33][34][35]. The deconvoluted Pt 4f X-ray photoelectron (XPS) spectra of the Pt/Y zeolites are shown in Figure 4.…”

Section: Catalystsmentioning

confidence: 52%

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Enhanced Catalytic Oxidation of Toluene over Hierarchical Pt/Y Zeolite

Kim

2022

Catalysts

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The development of efficient Pt-supported zeolite catalysts with tunable micro/mesopore structures for the removal of volatile organic compounds (VOCs) presents a major challenge. Herein, hierarchical Pt/Y zeolites with tunable mesopores are fabricated by varying the etching time before the surfactant-templated crystal rearrangement method and used as catalyst supports for VOC oxidation. The hierarchical Pt/Y zeolites provided an excellent environment for Pt nanoparticle loading with abundant accessible acidic sites. The catalytic performance of the obtained hierarchical Pt/Y zeolites is analyzed using toluene oxidation, with the modified zeolites exhibiting improved catalytic activities. The hierarchical Pt/Y zeolites exhibited higher catalytic toluene oxidation activities than non-hierarchical Pt/Y zeolites. Pt/Y-6h demonstrated the highest catalytic toluene oxidation activity of the prepared catalysts, with a T90 of 149 °C, reaction rate of 1.15 × 10−7 mol gcat−1 s−1, turnover frequency of 1.20 × 10−2 s−1, and an apparent activation energy of 66.5 kJ mol−1 at 60,000 mL g−1 h−1 at a toluene concentration of 1000 ppm. This study will facilitate the fine-tuning of hierarchically porous materials to improve material properties and achieve higher catalytic performance toward VOC oxidation.

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Section: Catalystsmentioning

confidence: 52%

“…Hence, they should be appropriately adjusted. Thus, introducing mesopores into Y zeolites allows the structure of the Pt nanoparticles to be controlled, as reported in previous studies [28,[32][33][34][35]. adjusted.…”

Section: Catalystsmentioning

confidence: 68%

Enhanced Catalytic Oxidation of Toluene over Hierarchical Pt/Y Zeolite

Kim

2022

Catalysts

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“…This material was prepared following previously published method. 26 Hexadecyltrimethylammonium bromide (5.0 g, 13.7 mmol) was dissolved in deionized water (2.4 L) followed by addition of NaOH (2 M, 17.5 mL). The solution was stirred for 1 h at 80 °C.…”

Section: Methodsmentioning

confidence: 99%

Non-Innocent Role of the Ceria Support in Pd-Catalyzed Halophenol Hydrodehalogenation

Naik

Sedinkin

et al. 2021

ACS Catal.

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The hydrodehalogenation (HDH) of halophenols is efficiently catalyzed by palladium supported on high surface ceria (Pd/CeO2) under mild conditions (35 °C, 1 atm H2). A combination of NMR, DRIFTS, Raman spectroscopy and XPS studies as well as HDH kinetics of substituted halobenzenes suggest the reaction proceeds mainly via a sequence of dissociative adsorption of phenolic hydroxyl onto the support, oxidative addition of Pd into the C-halogen bond and reductive elimination to give phenol and hydrogen halide. The dissociative adsorption of -OH group onto oxygen vacancies of the ceria support results in an electron-rich intermediate that facilitates the turnover-limiting reductive elimination step. In contrast, the direct pathway catalyzed by Pd without dissociative adsorption of the reactants on the support takes place at a slower rate. The mechanistic insights gained in this study were used to modify reaction conditions for enabling HDH of recalcitrant halides such as fluorides and iodides.

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“…Slowing et al . reported the preparation of Pd nanoparticles with controlled diameters inside the pore channels of mesoporous silica nanoparticles with various pore sizes, [105] synthesized by using alkyltrimethylammonium bromides with different chain lengths as surfactant templates. The samples with pore diameters of 2.2 and 2.7 nm were generated by applying surfactants with C 12 and C 16 alkyl chains.…”

Section: Other Porous Silica Materialsmentioning

confidence: 99%

Palladium Nanoparticles Supported on Porous Silica Materials as Heterogeneous Catalysts of C−C Coupling and Cross‐Coupling Reactions

Mastalir

Molnár

2023

ChemCatChem

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Noble metal nanoparticles supported on porous silica materials represent an important class of heterogeneous catalysts. Various synthesis strategies have been developed, including the application of ligand‐assisted metal precursors, multistep synthesis procedures, post‐synthetic modifications, and magnetic mesoporous silica particles. Emphasis has been laid on the introduction of green procedures, based on the utilization of environmentally friendly solvents, efficient stabilizing agents, non‐toxic reagents, and mild reaction conditions. Palladium nanoparticles have long been recognized as the most efficient catalysts in a wide range of organic transformations, including the Heck, Suzuki, Stille, and Sonogashira reactions. Although these transformations have been extensively investigated in homogeneous catalytic systems, the application of heterogeneous catalysts, including silica‐supported Pd0 nanoparticles, has gained in increasing importance. The aim of this review is to provide an outlook on the current research progress achieved on the development of novel synthetic procedures, affording highly dispersed Pd0 nanoparticles immobilized on porous silica materials, which proved to be efficient and recyclable catalysts in C–C coupling and cross‐coupling reactions.

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Regulating the Catalytic Activity of Pd Nanoparticles by Confinement in Ordered Mesoporous Supports

Cited by 10 publications

References 71 publications

Enhanced Catalytic Oxidation of Toluene over Hierarchical Pt/Y Zeolite

Enhanced Catalytic Oxidation of Toluene over Hierarchical Pt/Y Zeolite

Non-Innocent Role of the Ceria Support in Pd-Catalyzed Halophenol Hydrodehalogenation

Palladium Nanoparticles Supported on Porous Silica Materials as Heterogeneous Catalysts of C−C Coupling and Cross‐Coupling Reactions

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