Immobilization of tungsten chelate complexes on functionalized mesoporous silica SBA-15 as heterogeneous catalysts for oxidation of cyclopentene

Jin, Manman; Guo, Zhaobing; Lv, Zhiguo

doi:10.1007/s10853-019-03361-7

Cited by 15 publications

(4 citation statements)

References 51 publications

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“…31 A peak in SiO 2 (205 nm), SiO 2 − NH 2 /Pd (209 nm), and SiO 2 −S−Pd SA (213 nm) is also observed with a slight shift but an identical nature as characteristic of the SiO 2 substrate structure. 9,32 nm, hinting at the strong coordination of −SH groups to Pd through the d−d transition and ligand-to-metal charge transition (LMCT), 33,34 further demonstrating that in SiO 2 − S−Pd SA , Pd species experience a fundamentally different coordination and bonding environment. The presence of LMCT-relevant peaks in thiol-to-Pd-coordinated materials also shows that the Pd species in these materials are in the form of either clusters or single atoms since nanoparticles usually show weak-to-no peaks related to the LMCT.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Feeble Single-Atom Pd Catalysts for H₂ Production from Formic Acid

Doustkhah,

Tsunoji,

Mine

et al. 2024

ACS Appl. Mater. Interfaces

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Single-atom catalysts are thought to be the pinnacle of catalysis. However, for many reactions, their suitability has yet to be unequivocally proven. Here, we demonstrate why single Pd atoms (Pd SA ) are not catalytically ideal for generating H 2 from formic acid as a H 2 carrier. We loaded Pd SA on three silica substrates, mesoporous silicas functionalized with thiol, amine, and dithiocarbamate functional groups. The Pd catalytic activity on aminofunctionalized silica (SiO 2 −NH 2 /Pd SA ) was far higher than that of the thiolbased catalysts (SiO 2 −S−Pd SA and SiO 2 −NHCS 2 −Pd SA ), while the single-atom stability of SiO 2 −NH 2 /Pd SA against aggregation after the first catalytic cycle was the weakest. In this case, Pd aggregation boosted the reaction yield. Our experiments and calculations demonstrate that Pd SA in SiO 2 −NH 2 /Pd SA loosely binds with amine groups. This leads to a limited charge transfer from Pd to the amine groups and causes high aggregability and catalytic activity. According to the density functional calculations, the loose binding between Pd and N causes most of Pd's 4d electrons in amino-functionalized SiO 2 to remain close to the Fermi level and labile for catalysis. However, Pd SA chemically binds to the thiol group, resulting in strong hybridization between Pd and S, pulling Pd's 4d states deeper into the conduction band and away from the Fermi level. Consequently, fewer 4d electrons were available for catalysis.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Feeble Single-Atom Pd Catalysts for H₂ Production from Formic Acid

Doustkhah,

Tsunoji,

Mine

et al. 2024

ACS Appl. Mater. Interfaces

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“…Furthermore, a new band at 2361 cm −1 was identified as the vibration of the nitro of copper nitrate, therefore, these copper species entered the pore of SBA-15 mainly through the interaction with the Si–OH groups on the surface of catalysts. 23…”

Section: Resultsmentioning

confidence: 99%

“…[20][21][22] SBA-15 is considered by academia as a promising catalyst support. Jin et al 23 found that heterogeneous catalysts synthesised on SBA-15 were highly active in the three-phase oxidation reaction of cyclopentene (CPE) with H 2 O 2 . Zhang et al 24 investigated how the acid-silanol and basic-alkylamine bifunctional groups on the SBA-15 molecular sieve play a catalytic role in the hydroxylaldehyde condensation reaction of 5-hydroxymethylfurfural (HMF) with acetone.…”

Section: Introductionmentioning

confidence: 99%

The effect of copper-doped SBA-15 on catalytic oxidation of NO

Jia

et al. 2022

New J. Chem.

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“…This is considered as a potential green catalyst for industrial and biomedical applications. Recently, Jin et al . reported tungsten chelate complex in organic moieties (diphenyldichlorosilane)‐functionalized mesoporous silica SBA‐15.…”

Section: Applications Of Organo‐functionalized Porous Materialsmentioning

confidence: 99%

Recent Advances in the Preparation and Applications of Organo‐functionalized Porous Materials

Yadav

Baskaran

Anjali

et al. 2020

Chemistry An Asian Journal

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Organo‐functionalized materials with porous structure offer unique adsorption, catalytic and sensing properties. These unique properties make them available for various applications, including catalysis, CO2 capture and utilization, and drug delivery. The properties and the performance of these unique materials can be altered with suitable modifications on their surface. In this review, we summarize the recent advances in the preparation and applications of organo‐functionalized porous materials with different structures. Initially, a brief historical overview of functionalized porous materials is presented, and the subsequent sections discuss the recent developments and applications of various functional porous materials. In particular, the focus is given on the various methods used for the preparation of organo‐functionalized materials and their important roles in the heterogenization of homogeneous catalysts. A special emphasis is also given on the applications of these functionalized porous materials for catalysis, CO2 capture and drug delivery.

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Immobilization of tungsten chelate complexes on functionalized mesoporous silica SBA-15 as heterogeneous catalysts for oxidation of cyclopentene

Cited by 15 publications

References 51 publications

Feeble Single-Atom Pd Catalysts for H₂ Production from Formic Acid

Feeble Single-Atom Pd Catalysts for H₂ Production from Formic Acid

The effect of copper-doped SBA-15 on catalytic oxidation of NO

Recent Advances in the Preparation and Applications of Organo‐functionalized Porous Materials

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Immobilization of tungsten chelate complexes on functionalized mesoporous silica SBA-15 as heterogeneous catalysts for oxidation of cyclopentene

Cited by 15 publications

References 51 publications

Feeble Single-Atom Pd Catalysts for H2 Production from Formic Acid

Feeble Single-Atom Pd Catalysts for H2 Production from Formic Acid

The effect of copper-doped SBA-15 on catalytic oxidation of NO

Recent Advances in the Preparation and Applications of Organo‐functionalized Porous Materials

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Product

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Feeble Single-Atom Pd Catalysts for H₂ Production from Formic Acid

Feeble Single-Atom Pd Catalysts for H₂ Production from Formic Acid