Bimetallic systems of mesoporous ordered silica supports and noble metals nanoparticles

Zienkiewicz-Strzałka, Małgorzata; Deryło–Marczewska, Anna; Pikus, S.

doi:10.1016/j.micromeso.2016.03.013

Cited by 11 publications

(8 citation statements)

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“…The XPS spectra obtained from the Pt@SAPO-11 catalysts are provided in Figure and show two single peaks at binding energies of 71.3 and 74.7 eV. These peaks correspond to the 4f 7/2 and 4f 5/2 states of metallic platinum (Pt 0 ), respectively, − and are separated by approximately 3.4 eV, which is consistent with a prior report by Zienkiewicz-Strzalka et al Notably, the Pt loading slightly increased the binding energy values, possibly because of interactions between the Pt and the SAPO-11 support, which rendered the Pt nanoparticles more resistant to sintering . The enhanced interaction between the metal and the support is attributed to transfer of electrons from the active component .…”

Section: Resultssupporting

confidence: 88%

“…The XPS spectra obtained from the Pt@SAPO-11 catalysts are provided in Figure 5 and show two single peaks at binding energies of 71.3 and 74.7 eV. These peaks correspond to the 4f 7/2 and 4f 5/2 states of metallic platinum (Pt 0 ), respectively, 39−41 and are separated by approximately 3.4 eV, which is consistent with a prior report by Zienkiewicz-Strzalka et al 42 Notably, the Pt loading slightly increased the binding energy values, possibly Pt particle size based on XRD results is calculated from the Scherrer equation: 36 d = Kλ/β cos θ, where K is the structure constant (0.9 for spherical crystals), λ is the incident ray wavelength (0.1541 nm), β is the peak width at half height, and θ is the diffraction angle. because of interactions between the Pt and the SAPO-11 support, which rendered the Pt nanoparticles more resistant to sintering.…”

Section: Methodssupporting

confidence: 88%

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Decarboxylation of Oleic Acid Using Pt@SAPO-11 Catalysts Fabricated by In Situ Encapsulation

Liu

2021

Energy Fuels

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An in situ encapsulation process was used to prepare ordered worm-like mesoporous Pt@SAPO-11 catalysts with different Pt loadings. Transmission electron microscopy images showed that Pt nanoparticles encapsulated within the SAPO-11 support mesopores were uniformly distributed and highly dispersed and had a narrow particle size distribution of 2–7 nm. Scanning electron microscopy indicated that increasing the Pt loading from 0.6 to 1.6 wt % did not significantly change the crystalline morphology of the catalyst, although the crystallinity decreased slightly. The specific surface area and average pore diameter of the Pt@SAPO-11 were in the ranges of 72–116 m2/g and 8.1–9.5 nm, respectively, which are determined by the Brunauer–Emmett–Teller method and Barrett–Joyner–Halenda method, respectively. The NH3 thermal-programmed desorption established that increasing the Pt loading gradually decreased the total NH3 desorption and that a loading of 1.2 wt % produced the highest concentration of medium-strong acid sites (6.2 cm3/g STP). X-ray photoelectron spectroscopy and H2 temperature-programmed reduction showed that a Pt loading of 1.2 wt % gave the strongest interaction between Pt nanoparticles and the SAPO-11 support. The Pt@SAPO-11 catalysts were used for the preparation of C8–C17 alkanes by decarboxylation of oleic acid. Employing a reaction temperature of 340 °C, a CO2 atmosphere, a Pt loading on the catalyst of 1.2 wt %, and a reaction time of 4 h, 100% oleic acid conversion was obtained together with an 80% yield of C8–C17 alkanes.

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Section: Resultssupporting

confidence: 88%

Section: Methodssupporting

confidence: 88%

Decarboxylation of Oleic Acid Using Pt@SAPO-11 Catalysts Fabricated by In Situ Encapsulation

Liu

2021

Energy Fuels

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“…The resultant mixtures were stirred and refluxed at 150 C for 2 h. Amino-functionalized silicon dioxide particles was decorated with silver ions by wet impregnation approach. Final silver nanoparticles were formed by thermal reduction of silver ions at 300 C. The diamminesilver(I) complex [Ag(NH 3 ) 2 ] þ was applied as a silver precursor and prepared according to description specified in our earlier article (Zienkiewicz-Strzalka et al, 2016). Textural properties of initial and modified materials were obtained by measuring N 2 adsorption/desorption isotherms at À196 C using a Micromeritics ASAP2020 equipment.…”

Section: Methodsmentioning

confidence: 99%

Silver nanoparticles deposited on pyrogenic silica solids: Preparation and textural properties

Zienkiewicz-Strzałka

Błachnio

Deryło–Marczewska

et al. 2017

Adsorption Science & Technology

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Silver-based nanomaterials and composites are important components in materials science and engineering due to the reactivity of silver nanophase based on exceptional surface effects. Ag-doped SiO2 nanocomposites were synthesized by wet impregnation procedure of aminopropyl-functionalized silica materials with submicrometer structure. Aminopropyl-functionalized pyrogenic silicon dioxide with amount of amino groups established as half and close to full monolayer was used to immobilize the nanosilver phase obtained from ammoniacal silver complex as a noble metal precursor. Pyrogenic silicon dioxide as an inexpensive nanostructured material with useful properties including adsorptive affinity for noble metal ions and organic macromolecules was applied as a support for diamminesilver(I) ions and finally for silver nanoparticles. In the present study, the effect of amino-functionalization and silver nanoparticles deposition was monitored by investigation of the textural properties and thermal stability of obtained nanocomposites. The properties of the nanocomposites were investigated by transmission electron microscopy, nitrogen adsorption–desorption isotherms, and thermal analysis (thermogravimetry/differential scanning calorimetry).

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“…Mesoporous ordered silica SBA-15 was prepared by sol-gel procedure and described in detail in our previous work [17]. Mesoporous aluminosilicate composite was prepared by similar way in the presence of zeolite (in the form of NH 4 Y) during synthesis of mesoporous ordered silica.…”

Section: Methodsmentioning

confidence: 99%

Microstructure Characterization of Noble Metal-Silica Nanocomposites

Zienkiewicz-Strzałka

Pikus

2016

Acta Phys. Pol. A

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The presence of highly dispersed metal particles on solid supports with well-defined microstructure is important in the field of functional materials, active catalysts as well as bionanomaterials for medical applications. Noble metal nanostructures, in particular silver, palladium, and platinum nanoparticles were formed from ammine complexes ([Pt(NH3)4]Cl2, [Ag(NH3)2]OH, and [Pd(NH3)4]Cl2) and supported on high ordered mesoporous silica (SBA-15) and aluminosilica matrix. In this work, the distribution, composition and crystal structure of supported noble metal nanoparticles were determined and characterized. Finally the stability of incorporated nanostructures was confirmed. The microstructures of the obtained samples were analyzed by high resolution transmission electron microscopy. Obtained results indicated that developed procedures of synthesis and modification of mesoporous ordered silica or their derivate by proposed nanostructures are effective and allow to obtain new nanocomposites and nanocatalysts in repeatable and controlled way.

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Bimetallic systems of mesoporous ordered silica supports and noble metals nanoparticles

Cited by 11 publications

References 65 publications

Decarboxylation of Oleic Acid Using Pt@SAPO-11 Catalysts Fabricated by In Situ Encapsulation

Decarboxylation of Oleic Acid Using Pt@SAPO-11 Catalysts Fabricated by In Situ Encapsulation

Silver nanoparticles deposited on pyrogenic silica solids: Preparation and textural properties

Microstructure Characterization of Noble Metal-Silica Nanocomposites

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