State of palladium in palladium-aluminosilicate catalysts as studied by XPS and the catalytic activity of the catalysts in the deep oxidation of methane

Цырульников, П. Г.; Афонасенко, Т. Н.; Кощеев, С. В.; Boronin, A. I.

doi:10.1134/s0023158407050187

Cited by 37 publications

(16 citation statements)

References 7 publications

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“…Examination of the curve A shows that the treated Pd(dppf)Cl 2 catalyst has the identical binding energy ($338 eV), a characteristic binding energy for the Pd 2+ species [32], with the fresh Pd(dppf)Cl 2 catalyst. But the binding energy peak for the curve B just like that for the curve C shifts to around 336 eV, a characteristic binding energy for the Pd 0 metal [32,33], indicating that the oxidative Pd 2+ complex has been reduced into the Pd 0 active species by solvent DMSO, and the presence of a suitable base (CsF) is essential for the reduction even at the elevated temperature. DMSO solvent has been reported as a reducing reagent in other reaction systems [34][35][36].…”

Section: Resultsmentioning

confidence: 98%

Palladium catalyzed reductive homocoupling reactions of aromatic halides in dimethyl sulfoxide (DMSO) solution

Sun

et al. 2009

Journal of Organometallic Chemistry

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Section: Resultsmentioning

confidence: 98%

Palladium catalyzed reductive homocoupling reactions of aromatic halides in dimethyl sulfoxide (DMSO) solution

Sun

et al. 2009

Journal of Organometallic Chemistry

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“…The XPS spectrum shows four peaks, two at 333.7 and 351.8 eV originating from the gold substrate, and other two peaks at 334.2 and 339.5 eV, with an area ratio of 3 : 2 and a peak separation of 5.3 eV, which are associated with the (3d 5/2 ) and (3d 3/2 ) peaks of metallic palladium. [68][69][70] At this point it is critical to verify that the metal-deposition strategy does not result in short-circuits by penetration of PdNDs through the SAM and this is an effective route towards the deposition of a top-contact electrode on a monolayer film. To do so, I-V curves were recorded for gold|SAM(1)|PdND structures using a conductive atomic force microscope (c-AFM) with the PeakForce tunneling AFM (PF-TUNA) mode and a PF-TUNA cantilever (coated with Pt/Ir 20 nm, ca.…”

Section: Resultsmentioning

confidence: 99%

High surface coverage of a self-assembled monolayer by in situ synthesis of palladium nanodeposits

et al. 2017

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Nascent metal|monolayer|metal devices have been fabricated by depositing palladium, produced through a CO-confined growth method, onto a self-assembled monolayer of an amine-terminated oligo(phenylene ethynylene) derivative on a gold bottom electrode. The high surface area coverage (85%) of the organic monolayer by densely packed palladium particles was confirmed by X-ray photoemission spectroscopy (XPS) and atomic force microscopy (AFM). The electrical properties of these nascent Au|monolayer|Pd assemblies were determined from the I-V curves recorded with a conductive-AFM using the Peak Force Tunneling AFM (PF-TUNA™) mode. The I-V curves together with the electrochemical experiments performed rule out the formation of short-circuits due to palladium penetration through the monolayer, suggesting that the palladium deposition strategy is an effective method for the fabrication of molecular junctions without damaging the organic layer.

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“…In this case, palladium predominantly occurred in a metal form on the surfaces of both of the catalysts. An increase in the binding energies of the states of palladium in the bulk metal phase ( E b =335.2 eV) and oxide phase ( E b =336.8 eV) was most likely owing to the interaction of particles with the aluminosilicate supports …”

Section: Resultsmentioning

confidence: 99%

Glycerol Isopropyl Ethers: Direct Synthesis from Alcohols and Synthesis by the Reduction of Solketal

et al. 2017

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The catalytic reduction of solketal ((2,2‐dimethyl‐1,3‐dioxolan‐4‐yl)methanol) over bifunctional heterogeneous palladium catalysts is proposed as an alternative to the synthesis of glycerol isopropyl ethers by the etherification of glycerol. The direct synthesis of glycerol isopropyl ethers from isopropanol and glycerol requires severe conditions (T=130–150 °C, p(H2)=20–35 bar) and a large excess of isopropanol to reach a considerable yield. The main reaction products in the catalytic reduction of solketal are glycerol mono‐ and di‐isopropyl ethers and solketal isopropyl ether. Solketal conversion over Al‐HMS‐supported palladium catalysts (T=120 °C and p(H2)=20 bar) affords a mixture of ethers with a high degree of conversion (87 %), 78 % selectivity, and excellent regioselectivity between isomeric ethers. Zeolite‐BEA‐supported palladium catalysts also exhibit high activity but much lower selectivity because of intense acetone aldol condensation. The effects of Si/Al ratios in BEA zeolites and Al‐HMS aluminosilicates and the amounts of supported palladium (1 and 2 wt %) on the properties of the catalysts at different reaction temperatures and hydrogen pressures are considered.

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State of palladium in palladium-aluminosilicate catalysts as studied by XPS and the catalytic activity of the catalysts in the deep oxidation of methane

Cited by 37 publications

References 7 publications

Palladium catalyzed reductive homocoupling reactions of aromatic halides in dimethyl sulfoxide (DMSO) solution

Palladium catalyzed reductive homocoupling reactions of aromatic halides in dimethyl sulfoxide (DMSO) solution

High surface coverage of a self-assembled monolayer by in situ synthesis of palladium nanodeposits

Glycerol Isopropyl Ethers: Direct Synthesis from Alcohols and Synthesis by the Reduction of Solketal

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