Catalytic combustion of methane over palladium supported on alumina catalysts: Evidence for reconstruction of particles

Garbowski, Édouard; Feumi-Jantou, Christiane; Mouaddib, N.; Primet, Michel

doi:10.1016/0926-860x(94)80124-x

Cited by 162 publications

(89 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…For a Pd/A1203 catalyst, several authors found an increase in activity with time-onstream; see, e_g. Baldwin and Burch (1990a), Briot and Primet (1991 ) and Garbowski et al (1994). Most of the catalysts used showed both a positive and negative change in activity during the first hours of operation.…”

Section: And Discussionmentioning

confidence: 99%

The catalytic oxidation of organic contaminants in a packed bed reactor

Beld

Bijl

Reinders

et al. 1994

Chemical Engineering Science

View full text Add to dashboard Cite

Abstract--The catalytic oxidation of several hydrocarbons was studied over noble metal and metal oxide catalysts. A fast empirical method was developed to determine the minimum operating temperature required to guarantee complete conversion of the hydrocarbon.The influence of the operating parameters such as the inlet concentration and residence time, as well as the chemical character of the component to be oxidized, have been investigated. The results can be described satisfactorily by a simple isothermal, plug flow reactor model and first-order reaction kinetics. In the case of simultaneous oxidation of different components a significant mixture effect was not observed. The presence of water in the feed did significantly inhibit the oxidation of alkanes.Of the applied catalysts, Pt was the most effective for the combustion of the alkenes, whereas Pd showed a higher activity for the oxidation of alkanes.

show abstract

Section: And Discussionmentioning

confidence: 99%

The catalytic oxidation of organic contaminants in a packed bed reactor

Beld

Bijl

Reinders

et al. 1994

Chemical Engineering Science

View full text Add to dashboard Cite

show abstract

“…However, there is some disagreement in the literature over the surface form which is most active. Oh and co-workers [19,20]and Hicks et al [15,16] argue that the metal surface is more active than the oxide surface, whereas Burch and co-workers [21][22][23], Farrauto et al [24,25]and Primet and co-workers [26][27][28] consider the oxide surface as the most active phase.…”

Section: Relative Reactivity Of the Metal And Oxidementioning

confidence: 99%

Oscillatory behaviour during the oxidation of methane over palladium metal catalysts

Zhang

Lee

Mingos

et al. 2003

Applied Catalysis A: General

View full text Add to dashboard Cite

Oscillatory reactions over palladium foil and wire catalysts during the oxidation of methane have been investigated over a wide range of reaction temperatures and argon/methane/oxygen feed gas compositions. Characterisation of the catalyst has also been carried out using scanning electron microscopy (SEM) techniques, which revealed the presence of a porous surface. This suggested that the metal surface has undergone a change since the reaction commenced, and using X-ray powder diffraction (XRD) techniques the palladium phase was shown to be the dominant phase present. Hysteresis phenomena were observed in the activity of the reaction as the temperature was cycled up and down, showing that the metal surface was continually changing throughout the reaction. The activation energies of the reaction during the high reactivity mode, PdO, and low reactivity mode, Pd, were also calculated. Oscillation rates were observed to depend on the dominant surface. Oscillations were frequent when the high reactivity mode was dominant while the activation energy of this mode was found to be low. When the low reactivity mode was dominant, the oscillations were slower and the activation energy was three times larger. The results obtained imply that the behaviour of the palladium surface, switching back and forth from the reduced state to the oxidised state, is responsible for the oscillatory behaviour seen in this system.

show abstract

“…[1,2,3,4,5,6,7,8] Hence, there is a growing need to understand the key parameters determining the reaction mechanisms. One of the most important parameters crucially influencing the catalytic activity of Pd-based catalysts is their chemical state under reaction conditions which is known to switch between metallic and oxidic under typical reaction conditions, [6,9,10,11] depending on O 2 pressure and temperature.…”

Section: Introductionmentioning

confidence: 99%

“…Electron microscopy was also used to characterize the state of Pd during other hydrocarbon oxidation reactions. [3,25,26] Detailed high-resolution transmission electron microscopy (HRTEM) studies after annealing small Pd particles grown epitaxially on MgO single crystals and microcubes in oxygen atmosphere were provided by Henry and co-workers. [27,28,29] PdO formation on small Pd particles supported by γ-Al 2 O 3 upon heating in 1 bar oxygen in the temperature range of 623-1193 K has also been studied by Chen and Ruckenstein.…”

Section: Introductionmentioning

confidence: 99%

Growth and decomposition of aligned and ordered PdO nanoparticles

Penner

Wang

Jenewein

et al. 2006

The Journal of Chemical Physics

View full text Add to dashboard Cite

The formation, thermal decomposition, and reduction of small PdO particles were studied by high-resolution transmission electron microscopy and selected area electron diffraction. Welldefined Pd particles (mean size of 5-7 nm) were grown epitaxially on NaCl (001) surfaces and subsequently covered by a layer of amorphous SiO 2 (25 nm), prepared by reactive deposition of SiO in 10 -2 Pa O 2 . The resulting films were exposed to molecular O 2 in the temperature range of 373-673 K, and the growth of PdO was studied. The formation of a PdO phase starts at 623 K and is almost completed at 673 K. The high-resolution experiments suggest a topotactic growth of PdO crystallites on top of the original Pd particles. Subsequent reaction of the PdO in 10 mbar CO for 15 min and thermal decomposition in 1 bar He for 1 h were also investigated in the temperature range from 373 to 573 K. Reductive treatments in CO up to 493 K do not cause a significant change in the PdO structure. The reduction of PdO starts at 503 K and is completed at 523 K. In contrast, PdO decomposes in 1 bar He at around 573 K. The mechanism of PdO growth and decay is discussed and compared to results of previous studies on other metals, e.g., on rhodium.

show abstract

Catalytic combustion of methane over palladium supported on alumina catalysts: Evidence for reconstruction of particles

Cited by 162 publications

References 22 publications

The catalytic oxidation of organic contaminants in a packed bed reactor

The catalytic oxidation of organic contaminants in a packed bed reactor

Oscillatory behaviour during the oxidation of methane over palladium metal catalysts

Growth and decomposition of aligned and ordered PdO nanoparticles

Contact Info

Product

Resources

About