Complete Oxidation of Methane over Palladium Supported on Alumina Modified with Calcium, Lanthanum, and Cerium Ions

Stasińska, B.; Gac, Wojciech; Ioannides, Theophilos; Machocki, Andrzej

doi:10.1016/s1003-9953(08)60002-x

Cited by 17 publications

(10 citation statements)

References 15 publications

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“…20 g of poly(ethylene oxide-propylene oxide-ethylene oxide) triblock copolymer with the general formula EO 20 PO 70 EO 20 (Pluronic P123) was dissolved in 600 cm 3 of distilled water and 162 cm 3 of 2 M HCl. The mixture was stirred for 5 h at the temperature of 38 8C and afterwards 39.4 ml of TEOS was poured into the flask and the solution was stirred for 20 h at the same temperature.…”

Section: Experimental Partmentioning

confidence: 99%

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Controlled reduction of palladium nanoparticles on surface of chemically modified silicas

Ivashchenko¹,

Тертых

Yanishpolskii

et al. 2011

Materialwissenschaft Werkst

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The reduction of palladium ions by silicon hydride groups grafted to the surface of silica matrices was applied for the synthesis of palladium-containing nanocomposites. Ordered mesoporous silicas, such as MCM-41 and SBA-15, along with silochrom type silica were used as supports for palladium nanoparticles in order to obtain encapsulated in pores metal particles. The synthesized nanocomposites have been studied by IR-spectroscopy, X-ray diffraction analysis, low-temperature nitrogen adsorption and transmission electron microscopy.

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Section: Experimental Partmentioning

confidence: 99%

“…8.3 g of hexadecyltrimethylammonium bromide (CTAB) was dissolved in 270 cm 3 of distilled water. The mixture was stirred at the temperature of 40 8C, and afterwards 24 cm 3 of tetraethylortosilicate (TEOS) was introduced.…”

Section: Experimental Partmentioning

confidence: 99%

Controlled reduction of palladium nanoparticles on surface of chemically modified silicas

Ivashchenko¹,

Тертых

Yanishpolskii

et al. 2011

Materialwissenschaft Werkst

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“…The process allows not only to achieve methane complete oxidation in its low-concentrated mixtures, but it also may be carried out at moderate (depended on the catalyst used) temperatures [16]. Noble metals, especially palladium, placed on the supports with large specific surface areas and good thermal stability, demonstrated the highest activity for complete oxidation of methane among other [17,18].…”

Section: Introductionmentioning

confidence: 99%

Preparation, Characterization and Catalytic Activity of Palladium Nanoparticles Embedded in the Mesoporous Silica Matrices

Ivashchenko¹,

Gac²,

Tertykh³

et al. 2012

WJNSE

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Novel <i>in-situ</i> reduction approach was applied for the synthesis of palladium nanoparticles in the pores of mesoporous silica materials with grafted siliconhydride groups. Matrices possessing different structural properties (MCM-41, SBA-15 and Silochrom) were used. Samples were studied by nitrogen adsorption-desorption method, low-angle X-ray diffraction, transmission electron microscopy (TEM) and FT-IR/PAS spectroscopy. The temperature-programmed oxidation (TPO) and reduction (TPR) methods were applied to examine reducibility of palladium species. Palladium containing catalysts were tested in methane oxidation reaction. It was demonstrated that relatively large pores in SBA-15 type silica facilitated formation of well-dispersed palladium nanoparticles confined in the pores channels. In the case of MCM-41 support, metallic palladium nanoparticles were formed on the external surface. The obtained materials showed high catalytic activity. Lower activity of the samples containing small crystallites located in the pore volume at high temperatures was related to worse accessibility of active sites to the reation mixture

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“…When the reduction time has passed, the reactor is quenched in an ice bath for at least 20 min. This hydrothermal pre-reduction method is sufficiently strong to reduce palladium oxide but it will likely not suffice in reducing nickel oxide [52,53]. However, adding palladium oxide to base metal oxides (e.g., Cu or Ni) leads to greatly increased reducibility, possibly resulting in the reduction of some PdNi phases during in situ reduction or during the subsequent reaction in methanol at 150 • C [54].…”

Section: Catalyst Pre-reductionmentioning

confidence: 99%

Monometallic Cerium Layered Double Hydroxide Supported Pd-Ni Nanoparticles as High Performance Catalysts for Lignin Hydrogenolysis

et al. 2020

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Monometallic cerium layered double hydroxides (Ce-LDH) supports were successfully synthesized by a homogeneous alkalization route driven by hexamethylenetetramine (HMT). The formation of the Ce-LDH was confirmed and its structural and compositional properties studied by XRD, SEM, XPS, iodometric analyses and TGA. HT-XRD, N2-sorption and XRF analyses revealed that by increasing the calcination temperature from 200 to 800 °C, the Ce-LDH material transforms to ceria (CeO2) in four distinct phases, i.e., the loss of intramolecular water, dehydroxylation, removal of nitrate groups and removal of sulfate groups. When loaded with 2.5 wt% palladium (Pd) and 2.5 wt% nickel (Ni) and calcined at 500 °C, the PdNi-Ce-LDH-derived catalysts strongly outperform the PdNi-CeO2 benchmark catalyst in terms of conversion as well as selectivity for the hydrogenolysis of benzyl phenyl ether (BPE), a model compound for the α-O-4 ether linkage in lignin. The PdNi-Ce-LDH catalysts showed full selectivity towards phenol and toluene while the PdNi-CeO2 catalysts showed additional oxidation of toluene to benzoic acid. The highest BPE conversion was observed with the PdNi-Ce-LDH catalyst calcined at 600 °C, which could be related to an optimum in morphological and compositional characteristics of the support.

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Complete Oxidation of Methane over Palladium Supported on Alumina Modified with Calcium, Lanthanum, and Cerium Ions

Cited by 17 publications

References 15 publications

Controlled reduction of palladium nanoparticles on surface of chemically modified silicas

Controlled reduction of palladium nanoparticles on surface of chemically modified silicas

Preparation, Characterization and Catalytic Activity of Palladium Nanoparticles Embedded in the Mesoporous Silica Matrices

Monometallic Cerium Layered Double Hydroxide Supported Pd-Ni Nanoparticles as High Performance Catalysts for Lignin Hydrogenolysis

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