Results 271 to 280 of about 66,471 (314)
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On the Nature of the ‘Heterogeneous' Catalyst: Nickel-on-Charcoal
The Journal of Organic Chemistry, 2002Results from aromatic aminations and Kumada couplings, together with spectroscopic analyses (TEM, EDX, ICP-AES, React-IR), reveal that catalysis using nickel-on-charcoal (Ni/C) is most likely of a homogeneous rather than heterogeneous nature. In the course of a reaction with Ni/C, nickel bleed from the support was calculated to be as high as 78 ...
Lipshutz, B. +4 more
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Heterogeneous hydrogenation catalysts
Russian Chemical Reviews, 1998The main types of heterogeneous catalysts used for hydrogenation, the methods for their preparation, and the structure and chemistry of their surfaces are considered, as well as the catalytic activity and the mechanism of action in the hydrogenation of unsaturated and aromatic compounds, of CO, and of carbonyl compounds and in the hydrorefining of ...
Marina D Navalikhina, Oleg V Krylov
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Heterogeneous Catalysts for Toluene Oxidation
Chemistry – An Asian JournalAbstractThe selective activation of C(sp3)‐H bonds in toluene to produce high value‐added oxygenated chemicals represents a pivotal challenge and opportunity for both fundamental researches and industrial applications. Since the C(sp3)‐H bonds are both thermodynamically robust and kinetically inert, conventional catalytic techniques for the activation ...
Zhen Su +4 more
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Heterogenization of Metallocene Catalysts for Alkene Polymerization
Angewandte Chemie International Edition, 1999Beyond mere convenience: In large-scale industrial processes for alkene polymerization the essentially homogeneous metallocene/activator catalyst systems are heterogenized (example shown) to improve polymer properties. New mesoporous and organic catalyst supports and their application in this field of catalysis are described.
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Heterogenization of homogeneous catalysts
Journal of Molecular Catalysis, 1986The surface reactions which take place when TiCl4 is reacted with -AlEtCl or -AlEt2 on a silica surface have been studied by EPR and chemical analysis. These systems have been compared to the reverse reactions, when -TiCl3 anchored to the silica surface is reacted with Et2AlCl or Et3Al.
Ivar M. Dahl +2 more
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HETEROGENIZED HOMOGENEOUS CATALYSTS*
Annals of the New York Academy of Sciences, 1983Revue des complexes metal transition-coordinat phosphine a ammonium quaternaire.
Richard T. Smith +3 more
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Heterogeneous Metallocene Catalysts
1995Copolymerizations of olefins were carried out with the SiO2-, AI2O3- and MgCl2-supported Et[IndH4]2ZrCl2 catalysts combined with AIR3 as cocatalyst and the results were compared with those obtained previously in the presence of homogeneous Et[IndH4]2ZrCl2-MAO catalyst.
Kazuo Soga +3 more
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Heterogeneous Catalyst Preparation
2004In this chapter, the different preparation processes for the synthesis of heterogeneous catalysis are described, including co-precipitation, sol-gel technique and hydrothermal method. The extension to the different steps of industrial scale preparation is also considered.
Graham J. Hutchings, Jacques C. Védrine
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1997
Abstract of GB 2309655 (A) Heterogeneous catalysts comprising one or more metal compounds selected from the group consisting of tin, molybdenum, tungsten, zirconium and selenium compounds deposited on the surface of a silicalite are provided. Preferably Sn(IV) and/or Mo(VI) are employed. The catalysts are prepared by reacting a metal halide compound in
Dakka, J. (author) +2 more
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Abstract of GB 2309655 (A) Heterogeneous catalysts comprising one or more metal compounds selected from the group consisting of tin, molybdenum, tungsten, zirconium and selenium compounds deposited on the surface of a silicalite are provided. Preferably Sn(IV) and/or Mo(VI) are employed. The catalysts are prepared by reacting a metal halide compound in
Dakka, J. (author) +2 more
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Are Heterogeneous Catalysts Precursors to Homogeneous Catalysts?
Journal of the American Chemical Society, 2001I W, Davies +3 more
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