ESCA evidence for the occlusion of platinum particles in reduced PtY zeolites

Lunsford, Jack H.; Treybig, D. S.

doi:10.1016/0021-9517(81)90054-3

Cited by 21 publications

(1 citation statement)

References 4 publications

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“…The size of the iridium particles varies between 1 and 4 nm. As for the Co/CaY and Ru/CaY catalysts, the small IrS, particles which are probably located inside the zeolite pores are larger than the supercage dimensions, a phenomenon which has also been observed for metallic WCaY zeolites (Lunsford and Treybig, 1981). The explanation can be that the IrS, cluster occupies several neighboring supercages, or that it is located in voids and defects in the zeolite crystal.…”

Section: Methodsmentioning

confidence: 63%

Hydrocracking of N-Decane over Zeolite-Supported Metal Sulfide Catalysts. 1. CaY-Supported Transition Metal Sulfides

Welters¹,

Waerden²,

Zandbergen³

et al. 1995

Ind. Eng. Chem. Res.

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. (1995). Hydrocracking of n-decane over zeolite-supported metal sulfide catalysts. 1. CaY-supported transition metal sulfides. Industrial and Engineering Chemistry Research, 34(4), 1156-1165. DOI: 10.1021 General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. The hydrocracking properties of various Cay-supported metal (Fe, Co, Ni, Mo, Ru, Rh, Pd, W, Re, Ir, and Pt) sulfide catalysts (prepared by impregnation) are examined by studying the hydroconversion of n-decane. All catalysts show cracking conversions which are significantly higher than that of the Cay support. There are large differences in catalytic behavior dependent on the metal sulfide present on the zeolite support. The amounts of S present on the catalyst are analyzed to determine the degree of sulfidation of the metal sulfide, while high resolution electron microscopy is used to characterize the distribution of the metal sulfide phase over the zeolite support. The observed differences in activity can be explained by the differences in intrinsic activity of the metal sulfide phase and the differences in distribution of this phase over the zeolite particle (internal or external sulfide deposition).

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Section: Methodsmentioning

confidence: 63%

Hydrocracking of N-Decane over Zeolite-Supported Metal Sulfide Catalysts. 1. CaY-Supported Transition Metal Sulfides

Welters¹,

Waerden²,

Zandbergen³

et al. 1995

Ind. Eng. Chem. Res.

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Ethylene polymerization over transition‐metal supported catalysts. II. Cr on zeolite, silica, and charcoal: Characterization and activity studies

Zhang¹,

Matos²,

Lemos³

et al. 2003

J. Polym. Sci. A Polym. Chem.

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Cr catalysts supported on silica, zeolite NaY, and charcoal were prepared with two different methods. They were characterized and examined in the polymerization of ethene. Cyclic voltammetry, electron spin resonance, X‐ray photoelectron spectroscopy and silicon‐29 magic‐angle spinning nuclear magnetic resonance spectroscopy were used to characterize them, demonstrating that Cr is not in a single oxidation state, that the distribution among the various oxidation states depends on the history of the sample, and that even for a single oxidation state a variety of different environments can occur. In the polymerization of ethene, the supported Cr catalysts exhibited activity values varying from 103 to 105 gPE · molCr−1 · [M]−1 · h−1, depending on the choice of the support and on the method by which the Cr is placed on it. Silica seemed to be the most efficient support for Cr for this reaction. However, the zeolite‐supported catalysts also showed reasonable activity values (Ap ≅ 104 units) and presented the advantage of having a strong interaction between the Cr and the support, which may prevent leaching of the cation into the surrounding environment. © 2003 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 41: 3768–3780, 2003

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The Surface of the Transition Metals

Kiselev

Крылов

1989

Adsorption and Catalysis on Transition Metals and Their Oxides

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ESCA evidence for the occlusion of platinum particles in reduced PtY zeolites

Cited by 21 publications

References 4 publications

Hydrocracking of N-Decane over Zeolite-Supported Metal Sulfide Catalysts. 1. CaY-Supported Transition Metal Sulfides

Hydrocracking of N-Decane over Zeolite-Supported Metal Sulfide Catalysts. 1. CaY-Supported Transition Metal Sulfides

Ethylene polymerization over transition‐metal supported catalysts. II. Cr on zeolite, silica, and charcoal: Characterization and activity studies

The Surface of the Transition Metals

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