Pt supported on cross-linked poly(vinylsiloxanes) and SiCO ceramics — new materials for catalytic applications

Wójcik‐Bania, Monika; Krowiak, Agnieszka; Strzezik, Joanna; Hasik, Magdalena

doi:10.1016/j.matdes.2016.02.013

Cited by 22 publications

(22 citation statements)

References 28 publications

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“…These groups can be used as reactive sites in the processes performed after polymer cross-linking to modify the preceramic material which, upon pyrolysis, yields ceramics of the desired composition and/or properties. For example, in our previous work it was shown that Si-H groups remaining in poly(vinylsiloxane) reduce Pd 2+ and Pt 4+ ions to their metallic forms [ 14 , 15 ]. Pyrolysis of these materials results in Si-C-O ceramics containing Pd or Pt particles.…”

Section: Introductionmentioning

confidence: 99%

“…Pyrolysis of these materials results in Si-C-O ceramics containing Pd or Pt particles. It was also found that the presence of Pd or Pt in the preceramic systems influences the mechanism of their thermal degradation and increases ceramic yields [ 14 , 15 ]. Catalytic conversion of propan-2-ol conducted in the presence of both, preceramic poly(vinylsiloxanes) and Si-C-O materials with introduced Pt particles was studied [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

“…It was also found that the presence of Pd or Pt in the preceramic systems influences the mechanism of their thermal degradation and increases ceramic yields [ 14 , 15 ]. Catalytic conversion of propan-2-ol conducted in the presence of both, preceramic poly(vinylsiloxanes) and Si-C-O materials with introduced Pt particles was studied [ 15 ]. It should be noted that the described studies concerned preceramic networks of non-porous microstructure.…”

Section: Introductionmentioning

confidence: 99%

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Porous Materials Based on Poly(methylvinylsiloxane) Cross-Linked with 1,3,5,7-Tetramethylcyclotetrasiloxane in High Internal Phase Emulsion as Precursors to Si-C-O and Si-C-O/Pd Ceramics

2021

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Polysiloxane networks were prepared by hydrosilylation of poly(methylvinylsiloxane) (V3 polymer) with 1,3,5,7-tetramethylcyclotetrasiloxane (D4H) at various Si-Vinyl: Si-H groups molar ratios in water-in-oil high internal phase emulsion (HIPE). Curing the emulsions followed by removal of water led to foamed cross-linked polysiloxane systems differing in the cross-linking degrees, as well as residual Si-H and Si-Vinyl group concentrations. Treatment of thus obtained materials in Pd(OAc)2 solution in tetrahydrofuran resulted in the formation of porous palladium/polymer nanocomposites with different Pd contents (1.09–1.70 wt %). Conducted investigations showed that pyrolysis of the studied materials at 1000 °C in argon atmosphere leads to porous Si-C-O and Si-C-O/Pd ceramics containing amorphous carbon and graphitic phases. Thermogravimetric (TG) analysis of the starting cross-linked polymer materials and those containing Pd nanoparticles revealed that the presence of palladium deteriorates thermal stability and decreases ceramic yields of preceramic networks. The extent of this effect depends on polymer cross-linking density in the system.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Porous Materials Based on Poly(methylvinylsiloxane) Cross-Linked with 1,3,5,7-Tetramethylcyclotetrasiloxane in High Internal Phase Emulsion as Precursors to Si-C-O and Si-C-O/Pd Ceramics

2021

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“…Besides them, in situ formation of metal nanoparticles in a polymer‐derived ceramics (PDCs) matrix proofed to result in small and very homogeneously distributed metal particles . A great variety of metals such as nickel, iridium, platinum, palladium, iron, cobalt, copper, silver, and gold were incorporated in PDC matrixes . However, only some metal‐containing systems were fabricated for heterogeneous catalysis.…”

Section: Introductionmentioning

confidence: 99%

“…[11][12][13] A great variety of metals such as nickel, iridium, platinum, palladium, iron, cobalt, copper, silver, and gold were incorporated in PDC matrixes. [13][14][15][16] However, only some metal-containing systems were fabricated for heterogeneous catalysis. Compared with conventional preparation processes, the in situ formation of metal particles and their reduction during inert-gas pyrolysis prevents the generation of hardly reducible oxides.…”

Section: Introductionmentioning

confidence: 99%

Porous SiOC monoliths with catalytic activity by in situ formation of Ni nanoparticles in solution‐based freeze casting

2020

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Micro‐ and macroporous monoliths with in situ formed nickel nanoparticles were prepared for the first time by the combination of solution‐based freeze casting and preceramic polymers (methyl polysiloxane). This one‐step process results in macroporous monoliths composed of microporous and catalytic active nickel‐containing polymer‐derived ceramic. Four different complexing and cross‐linking siloxanes with amino functionality were screened for their ability to create small nickel particles. TEM analysis confirmed 3‐aminopropyltriethoxysilane being most efficient. High BET‐specific surface areas of 344‐461 m2 g−1 were achieved. Increased ratio of complexing groups to nickel improves the dispersion of nickel to (3.61 ± 1.49) nm. The nickel size dependence of conversion (maximum 0.49) and CH4 selectivity (maximum 0.74) in CO2 methanation emphasizes the importance of controlling the nickel size. The hydrophobic surface characteristic is hypothesized to be the main reason polymer‐derived catalysts having better catalytic activity compared with nickel‐impregnated silica. The promising catalytic activity combined with the versatile freeze casting process can prospectively address heat‐ and mass‐transfer considerations in heterogeneous monolith catalysis.

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Silver nanoparticles deposited on polysiloxane networks as active catalysts in dye degradation

Wójcik‐Bania

Stochmal

Duraczyńska

2020

J of Applied Polymer Sci

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The article proposes a new method of obtaining silver nanoparticles on polysiloxane networks using the reducing properties of Si–H groups. Three types of networks with different architecture and distribution of Si–H groups were studied as reducing agents for silver ions and as matrices for the obtained silver nanoparticles. As established by FTIR spectroscopic studies, the redox reaction between Ag+ ions from the silver heptafluorobutyrate solution in toluene and Si–H groups of the networks occurred, which resulted in the appearance of silver nanoparticles in the systems. The amount of metal introduced into individual polysiloxane networks is closely related to the consumption of Si–H groups in them. The type of polysiloxane networks used affects the size of Ag NPs obtained and their distribution on the carrier. Polysiloxane‐Ag systems are observed to be an effective catalyst on reduction of hazardous dye like methyl red, which is confirmed by a decrease in absorbance maximum values.

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Pt supported on cross-linked poly(vinylsiloxanes) and SiCO ceramics — new materials for catalytic applications

Cited by 22 publications

References 28 publications

Porous Materials Based on Poly(methylvinylsiloxane) Cross-Linked with 1,3,5,7-Tetramethylcyclotetrasiloxane in High Internal Phase Emulsion as Precursors to Si-C-O and Si-C-O/Pd Ceramics

Porous Materials Based on Poly(methylvinylsiloxane) Cross-Linked with 1,3,5,7-Tetramethylcyclotetrasiloxane in High Internal Phase Emulsion as Precursors to Si-C-O and Si-C-O/Pd Ceramics

Porous SiOC monoliths with catalytic activity by in situ formation of Ni nanoparticles in solution‐based freeze casting

Silver nanoparticles deposited on polysiloxane networks as active catalysts in dye degradation

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