Dispersion stability and methylcyclopentane hydrogenolysis in Pd/Al2O3 catalysts

Gaspar, Alexandre B.; Dieguez, L.C.

doi:10.1016/s0926-860x(00)00442-7

Cited by 92 publications

(46 citation statements)

References 29 publications

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“…In many catalyst systems, the presence of the halide anion is known to affect various aspects of the generation and subsequent behaviour of these materials [18][19][20][21][22]. In this paper we will apply the same approach, combining Quick Pd K-edge EXAFS (QEXAFS) with Cl and Pd L 3 edge XANES, to examine the role of residual Cl in the reduction of Al 2 O 3 supported Pd catalysts.…”

Section: Introductionmentioning

confidence: 99%

Effects of Cl on the reduction of supported PdO in ethanol/water solvent mixtures

Brazier

Newton

Barreiro

et al. 2017

Catalysis, Structure & Reactivity

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Section: Introductionmentioning

confidence: 99%

Effects of Cl on the reduction of supported PdO in ethanol/water solvent mixtures

Brazier

Newton

Barreiro

et al. 2017

Catalysis, Structure & Reactivity

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“…3a), an intense band at 280 nm in case of sample 2 can be attributed to Pd-O charge transfer, and is characteristic of welldispersed Pd in interaction with an oxide support (Feio et al 2007;Ivanova et al 2010). The same band around 280 nm, however, has been claimed previously to be due to (Gaspar and Dieguez 2000). A broad band in the d-d transition region from 450 to 500 nm (maximum at about 490 nm), which is much more pronounced in the spectra of sample 1, has been attributed to bulk PdO particles of different size with no interaction with the support (Alegre et al 2006;Ivanova et al 2010).…”

Section: Structural Investigationmentioning

confidence: 49%

Strong metal–support interaction as activity requirement of palladium-supported tin oxide sol–gel catalyst for water denitration

Bošković

Kovacevic

Kiss

et al. 2012

Int. J. Environ. Sci. Technol.

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Two nanocrystalline palladium-supported tin oxide catalysts for water denitration were synthesized by a modified sol-gel technique using appropriate chloride precursors for both support and active phases, and citric acid to tune the rate of hydrolysis and condensation. The difference among sample preparation procedures refers to the moment of the noble metal loading to the support, as well as to the calcination temperature altitude followed. Thus, mesoporous tin oxide was synthesized by a sol-gel method following calcination at 700°C. The palladium active phase was introduced afterwards by means of palladium chloride solution impregnation, followed by calcination at 400°C (sample 1). Alternatively, simultaneous complexation of both metal and support precursors followed by single calcination at 700°C was applied for preparation of sample 2. The former sample showed higher activity and selectivity in hydro-denitration of water model system initially containing 100 ppm of nitrates. This was explained by preferential textural, morphological and structural properties accomplished by early contact of metal and support nanoparticles, while achieved by calcination at high single temperature forcing diffusion of palladium ions into the tin oxide matrix. The outcome is very well distribution of palladium and strong metal-support interaction leading to multivalent tin. This indicates partly reduced tin oxide formation in the course of its reduction in hydrogen, which may act as active site in denitration reaction.

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“…The bands at 260 and 290 are ascribed to transition 4f-5d of Ce in CeO2 clusters, respectively [23,24]. The band at 240 nm is ascribed to the charge transfer Pd→O [25].…”

Section: Temperature Programmed Reaction Under Hydrogen (H2-tpr)mentioning

confidence: 97%

On the Effect of Preparation Methods of PdCe-MOR Catalysts as NOx CH4-SCR System for Natural Gas Vehicles Application

et al. 2015

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Abstract:In the present work, the effect of several parameters involved in the preparation of PdCe-HMOR catalysts active for NOx selective catalytic reduction with methane (NOx CH4-SCR) was studied. Results show that the catalytic performance of Pd-HMOR is better when palladium is introduced by ion-exchange, namely at room temperature. It was also shown that Pd loading does not influence the formation of cerium species, namely surface Ce 4+ (CeO2) species and CeO2 species in interaction with Pd. However, when Ce is introduced before Pd, more surface CeO2 species are stabilized in the support and less CeO2 become in interaction with Pd, which results in a worse NOx CH4-SCR catalytic performance.

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Dispersion stability and methylcyclopentane hydrogenolysis in Pd/Al2O3 catalysts

Cited by 92 publications

References 29 publications

Effects of Cl on the reduction of supported PdO in ethanol/water solvent mixtures

Effects of Cl on the reduction of supported PdO in ethanol/water solvent mixtures

Strong metal–support interaction as activity requirement of palladium-supported tin oxide sol–gel catalyst for water denitration

On the Effect of Preparation Methods of PdCe-MOR Catalysts as NOx CH4-SCR System for Natural Gas Vehicles Application

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