Laponite-derived porous clay heterostructures: II. FTIR study of the structure evolution

Pálková, Helena; Madejová, Jana; Zimowska, Małgorzata; Serwicka, Ewa M.

doi:10.1016/j.micromeso.2009.07.012

Cited by 97 publications

(46 citation statements)

References 36 publications

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“…(1) and (2) [34], the latter two of which are not present on the silica support and probably responsible for the stronger adsorption of the intermediates. These adsorption sites are most probably lead to the basic character of Laponite surface [35].…”

Section: Catalytic Hydroconversion Of Pnmentioning

confidence: 99%

Catalytic hydrodenitrogenation of propionitrile over supported nickel phosphide catalysts as a model reaction for the transformation of pyrolysis oil obtained from animal by-products

Badari

Lónyi

Dóbé

et al. 2015

Reac Kinet Mech Cat

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Catalytic hydroconversion of propionitrile (PN) was studied over supported nickel and nickel phosphide catalysts. PN was used as model compound of aliphatic nitriles in pyrolysis oil obtained from animal by-products. Silica gel and Laponite was used as support. The structure and particle size of the supported active phase was characterized by X-ray diffractometry formation. Conversion of PN to hydrocarbon and ammonia hardly proceeded below 300 °C but became dominating reaction between 350-400 °C. Brønsted-acid sites were not required for the reactions. Supported Ni 2 P catalysts catalyzed hydrogenolysis of C-N bonds only, whereas also the C-C bonds suffered significant cleavage over supported Ni catalyst.

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Section: Catalytic Hydroconversion Of Pnmentioning

confidence: 99%

Catalytic hydrodenitrogenation of propionitrile over supported nickel phosphide catalysts as a model reaction for the transformation of pyrolysis oil obtained from animal by-products

Badari

Lónyi

Dóbé

et al. 2015

Reac Kinet Mech Cat

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“…Some authors, such as Pálkova et al 13 and Nunes et al 21 suggest that acidic properties of pillared clays are attributed to the presence of SiOH or AlOH groups. An efficient way to investigate this association is the use of organic bases such as pyridine, which second Chmielarz et al 22 , has frequently been used in the study of acidic sites.…”

Section: Acidity Characterizationmentioning

confidence: 99%

“…Figures 1, 2 and 3 show pyridine spectra adsorbed on samples of the oligomers modified with vermiculite Al 13 Gyftopoulou et al 24 report the samples acidic character of pillared vermiculites derived from both Brönsted sites (proton donor) and Lewis sites (receiver pair of electrons). Brönsted acidity may be associated with the protons release during pillars and the vermiculite lamellae dehydroxylation, whereas the Lewis acidity is assigned to metal oxides pillars.…”

Section: Acidity Characterizationmentioning

confidence: 99%

“…Since then the issue has been addressed in many studies [1][2][3][4][5] . Ions such as Keggin, also called an polycationic oligomer Al 13 6,7 , which has the empirical formula [Al 13 O 4( OH) 24 (H 2 O) 12 ] 7+ , are interspersed in the clay lamellae such as smectites and vermiculites by ion exchange 8 , which will subsequently calcined to obtain crystalline oxides structures like pillars in the clays internal structures 9,10 . Textural and catalytic properties of the mesoporous clays are related to its intrinsic characteristics due great exposure of active sites by the presence of metal oxides or pillars in the interlayer spacing, thereby increasing the surface area and creating porosity in the material.…”

Section: Introductionmentioning

confidence: 99%

“…The tetrahedral contain mainly Si(IV) as the central atom, while the octahedral sites are occupied by Al(III), Fe(III) or Mg(II). Two types of octahedral sheets occur in clay minerals: the dioctahedral type, where two-thirds of the octahedral sites are occupied mainly by Al(III), Fe(III) or Mg(II) and the trioctahedral type, with most of the sites occupied by Mg(II) or Li(I) [13][14][15] . Iron is another important characteristic of the clay, which is a chemical species naturally occurring clay minerals from the vermiculites group 16,17 .…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Study of the effects of lanthanum and the iron ion on the acidic properties of Al-pillared vermiculite

Fernandes

Silva

2013

Mat. Res.

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The synthesis of porous materials has attracted interest for decades due to their applications in catalysis and gas adsorption. 7 + (where x equals the molar amount of lanthanum), followed by calcination, may cause variation in the acidic properties. The analyzes showed that increasing the amount of La on oligomer results in a higher acidity shown in the spectrum a characteristic band in the region of 1445 and 1545cm -1 to Lewis and Brönsted respectively, predominantly of the last one. The Mössbauer spectroscopy results showed a relationship between increased symmetry of the octahedral site of iron (Fe 3+ ) and increased lanthanum doping, and consequently a sharp increase in acidity.

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Silk Embolic Material for Catheter‐Directed Endovascular Drug Delivery

Albadawi

Zhang

et al. 2021

Advanced Materials

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Embolization is a catheter‐based minimally invasive procedure that deliberately occludes diseased blood vessels for treatment purposes. A novel silk‐based embolic material (SEM) that is developed and optimized to provide tandem integration of both embolization and the delivery of therapeutics is reported. Natural silk is processed into fibroin proteins of varying lengths and is combined with charged nanoclay particles to allow visibility and injectability using clinical catheters as small as 600 μm in diameter at lengths >100 cm. SEMs loaded with fluorochrome labeled bovine albumin and Nivolumab, which is among the most used immunotherapy drugs worldwide, demonstrate a sustained release profile in vitro over 28 days. In a porcine renal survival model, SEMs with labeled albumin and Nivolumab successfully embolize porcine arteries without recanalization and lead to the delivery of both albumin and Nivolumab into the interstitial space of the renal cortex. Mechanistically, it is shown that tissue delivery is most optimal when the internal elastic membrane of the embolized artery is disrupted. SEM is a potential next‐generation multifunctional embolic agent that can achieve embolization and deliver a wide range of therapeutics to treat vascular diseases including tumors.

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Laponite-derived porous clay heterostructures: II. FTIR study of the structure evolution

Cited by 97 publications

References 36 publications

Catalytic hydrodenitrogenation of propionitrile over supported nickel phosphide catalysts as a model reaction for the transformation of pyrolysis oil obtained from animal by-products

Catalytic hydrodenitrogenation of propionitrile over supported nickel phosphide catalysts as a model reaction for the transformation of pyrolysis oil obtained from animal by-products

Study of the effects of lanthanum and the iron ion on the acidic properties of Al-pillared vermiculite

Silk Embolic Material for Catheter‐Directed Endovascular Drug Delivery

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