Non-aqueous sol–gel synthesis, characterization and catalytic properties of metal fluoride supported palladium nanoparticles

Patil, Pratap T.; Dimitrov, Anton; Kirmse, Holm; Neumann, Wolfgang; Kemnitz, Erhard

doi:10.1016/j.apcatb.2007.07.023

Cited by 28 publications

(31 citation statements)

References 43 publications

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“…This is relevant to further discussion on the reaction mechanism of n-pentane isomerization (see below). The FTIR-PAS spectra herein resemble those obtained by Patil et al, [11] indicating appropriateness and good reproducibility of catalyst synthesis.…”

Section: Catalyst Characterizationsupporting

confidence: 77%

“…Incorporation of Pt(Pd) did not influence the acidic properties of HSAlF 3 in line with previous findings. [11] Both, the metal-free HSAlF 3 -support and reduced Pd(Pt)/HS-AlF 3 -samples contain Lewis acid sites. As mentioned, less expected Brønsted acid sites, indicated by the peak at approximately 1545 cm À1 in the FTIR spectrum, would result from water formed during the reduction that is adsorbed on Lewis surface sites.…”

Section: Discussionmentioning

confidence: 99%

“…Such superior characteristics are largely maintained during high-temperature treatments, up to approximately 350 8C, in good agreement with earlier reported preparations. [11] This temperature was intentionally selected for standard catalyst screenings to study the stability of the catalysts under such severe reaction conditions. It was found that the amorphous-like structure was maintained in the catalyst subjected to n-pentane conversion performed at 350 8C for overnight.…”

Section: Discussionmentioning

confidence: 99%

“…[10,11] Briefly, the synthesis proceeded in three steps. First, the fluorolysis of aluminum alkoxide in dehydrated THF was performed by addition of anhydrous HF followed immediately by addition of Pd(Pt)(acac) 2 to the formed sol, resulting in the preparation of 2.0 wt % metalloaded catalysts.…”

Section: Methodsmentioning

confidence: 99%

“…FTIR-PAS spectra confirm that the incorporation of Pt(Pd) does not influence the acidic character of HS-AlF 3 . [11] It is obvious that all presented samples, that is, HSAlF 3 and unreduced, reduced, and postreaction samples of Pd(Pt)/HS-AlF 3 catalysts, have both Lewis and Brønsted acid sites. No significant changes in the acidity character are caused by running the catalysts in npentane isomerization.…”

Section: Catalyst Characterizationmentioning

confidence: 98%

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Aluminum Fluoride‐Supported Platinum and Palladium as Highly Efficient Catalysts of n‐Pentane Hydroisomerization

Machynskyy¹,

Kemnitz²,

Karpiński³

2014

ChemCatChem

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Experimental evidence for Pd‐based structure modification of electrocatalysts with hydrogen during their chemical synthesis is still missing. Therefore, in situ X‐ray diffraction (XRD) techniques were as used to investigate hydrogen insertion into the lattice of Pd nanomaterials during their preparation. It was shown that the use of NaBH4 as reducing agent led to PdHx whereas L‐ascorbic acid gave Pd nanoparticles. The subsequent influence of hydrogen insertion on the catalytic properties of Pd nanostructures was demonstrated by using carbon monoxide and glucose as probing molecules. High active surface areas and catalytic activities were found for the unmodified Pd nanostructures through electrochemical studies. Notably, the reducing agent has a significant effect on the size distribution of the nanoparticles. Its use can precisely and effectively tune their catalytic properties. Consequently, the remarkable behavior uncovered herein provides new strategic routes that can be used for the preparation of Pd‐based nanomaterials.

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Section: Catalyst Characterizationsupporting

confidence: 77%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Catalyst Characterizationmentioning

confidence: 98%

See 3 more Smart Citations

Aluminum Fluoride‐Supported Platinum and Palladium as Highly Efficient Catalysts of n‐Pentane Hydroisomerization

Machynskyy¹,

Kemnitz²,

Karpiński³

2014

ChemCatChem

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High Surface Area Metal Fluorides as Catalysts

Kemnitz

Rüdiger

2010

Functionalized Inorganic Fluorides

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Unveiling the catalytic potential of K₂ZnF₆ fluoroperovskite for glycerol oligomerization

Barros,

Moreno‐Tost,

Cecilia

et al. 2024

Biofuels Bioprod Bioref

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This study systematically evaluates fluorine‐containing materials with varying compositions of K, Al, Co, Cu, Mg, and Zn as catalysts for glycerol oligomerization. Comprehensive analyses were conducted for all of the catalysts, considering their structural, compositional, morphological characteristics, and basicity, to understand them in greater depth. Among these analyses, gas chromatography was employed to examine the composition of the reaction products. The investigation extended to a recycling study under optimized conditions. Thermogravimetric analysis and X‐ray photoelectron spectroscopy were used to characterize the spent catalysts. Catalytic activity was found to be influenced strongly by the fluorine content, demonstrating remarkable performance for the materials containing fluoroperovskites such as KMgF3 in the catalyst KMgAFC, and K2ZnF6 in KZAFC. Remarkably, KZAFC with 20% fluorine exhibited superior glycerol conversion (68%) and selectivity for diglycerol (27%). Comparative analysis with ZnAl‐layered double hydroxide highlighted the positive impact of fluorine on catalytic activity. Introducing a calcination step in the catalyst recovery process also demonstrated improved activity during recycling. Interestingly, KZAFC exhibited stability over four reaction cycles, presenting an economic advantage over homogeneous catalysts. The study also shed light on the potential fluorine loss at the surface and potassium leaching into reaction products, correlating these phenomena with the observed decline in activity. These comprehensive findings contribute significantly to advancing sustainable glycerol valorization through heterogeneous catalysis.

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Non-aqueous sol–gel synthesis, characterization and catalytic properties of metal fluoride supported palladium nanoparticles

Cited by 28 publications

References 43 publications

Aluminum Fluoride‐Supported Platinum and Palladium as Highly Efficient Catalysts of n‐Pentane Hydroisomerization

Aluminum Fluoride‐Supported Platinum and Palladium as Highly Efficient Catalysts of n‐Pentane Hydroisomerization

High Surface Area Metal Fluorides as Catalysts

Unveiling the catalytic potential of K₂ZnF₆ fluoroperovskite for glycerol oligomerization

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Non-aqueous sol–gel synthesis, characterization and catalytic properties of metal fluoride supported palladium nanoparticles

Cited by 28 publications

References 43 publications

Aluminum Fluoride‐Supported Platinum and Palladium as Highly Efficient Catalysts of n‐Pentane Hydroisomerization

Aluminum Fluoride‐Supported Platinum and Palladium as Highly Efficient Catalysts of n‐Pentane Hydroisomerization

High Surface Area Metal Fluorides as Catalysts

Unveiling the catalytic potential of K2ZnF6 fluoroperovskite for glycerol oligomerization

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Product

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Unveiling the catalytic potential of K₂ZnF₆ fluoroperovskite for glycerol oligomerization