Výsledky vyhledávání - "Ruud H. M. Herold"

Synthesis and characterisation of titanium silasesquioxane complexes: soluble models for the active site in titanium silicate epoxidation catalysts †

Autor: Martijn T. A. Overgaag, A. Guy Orpen, Ruud H. M. Herold, Mark Crocker

Publikováno v: Journal of the Chemical Society, Dalton Transactions. :3791-3804

Titanium silasesquioxane complexes have been prepared as models for the catalytically active centres in titanium silicate oxidation catalysts. Complexes [TiL(R7Si7O12)] [R = c-C6H11, L = CH2Ph 5, NMe2 6, OSiMe3 7, OPri 8 or OBut 9; R = c-C5H9, L = CH

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::16ab0039fe9bfa7b456e2e70f9fc182f
https://doi.org/10.1039/a905887g

Zobrazit plný text záznamu

Do titanyl groups exist in titanium silicates? An experimental study

Autor: Mark Crocker, Antonio E. Wilson, Bert G Roosenbrand, Ruud H. M. Herold, Kees A. Emeis

Publikováno v: Colloids and Surfaces A: Physicochemical and Engineering Aspects. 139:351-368

Two synthetic routes have been investigated, aimed at the preparation of silica-supported titanyl (>TiO) and titanol (>Ti(OH) 2 ) groups, the latter corresponding to the hydrated form of the titanyl group. In the first synthetic route, the titanyl

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::530b5b8b03000608d70143f64b4f27ab
https://doi.org/10.1016/s0927-7757(98)00371-9

Zobrazit plný text záznamu

Sulfur dioxide as a chemical probe for titanyl groups in titanium silicalites

Autor: Kees A. Emeis, Ruud H. M. Herold, Mark Crocker

Publikováno v: Journal of Molecular Catalysis A: Chemical. 110:L7-L11

The reaction of titanyl (TiO) groups with SO 2 , which for molecular titanyl complexes is found to occur readily at room temperature, has been used to test for the presence of titanyl groups in titanium silicalite (TS-1) and Ti-MCM-41. Exposure of

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::0f1d8cbecb278c0ac530c4a75f38eec9
https://doi.org/10.1016/1381-1169(96)00072-6

Zobrazit plný text záznamu

Studies on the acidity of mordenite and ZSM 5. 1. Determination of Broensted acid site concentrations in mordenite and ZSM 5 by conductometric titration

Autor: J. N. Van der Moolen, C. A. Emeis, Ruud H. M. Herold, M. H. W. Sonnemans, Mark Crocker, A. E. Wilson

Publikováno v: The Journal of Physical Chemistry. 97:432-439

The Broensted acidity of H-mordenite and H-ZSM-5 samples of varying proton concentration has been studied using aqueous conductometric titration, IR spectroscopy, and aqueous potentiometric titration. Good agreement is observed between Broensted acid

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::988e24b7b263797095a6507f69176d55
https://doi.org/10.1021/j100104a027

Zobrazit plný text záznamu

Stabilisation of cationic iridium hydrogenation catalysts via intercalation in montmorillonite clay

Autor: Ruud H. M. Herold, M. Crocket

Publikováno v: Catalysis Letters. 18:243-251

The olefin hydrogenation catalysts [Ir(COD)(PPh3)2]+ and [Ir(COD)(NCMe)(PCy3)]+ have been intercalated in montmorillonite clay via an ion-exchange procedure. While the initial activity of the intercalated catalysts for the hydrogenation of cyclohexen

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d9c332bb77f59cb2773e15875e2f0f65
https://doi.org/10.1007/bf00769443

Zobrazit plný text záznamu

Preparation of acidic forms of montmorillonite clay via solid-state ion-exchange reactions

Autor: M. Krijger, C. A. Emeis, Mark Crocker, Ruud H. M. Herold

Publikováno v: Catalysis Letters. 15:339-345

A solid-state procedure has been developed which enables A13+ and Fe3+ ion-exchanged montmorillonite to be prepared via co-grinding of the clay with the appropriate metal nitrate at room temperature. Pyridine adsorption/infrared spectroscopic studies

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1914defb4f2bbda4bc04cef07ac238d9
https://doi.org/10.1007/bf00769156

Zobrazit plný text záznamu

Synthesis and structural characterisation of tripodal titanium silsesquioxane complexes: a new class of highly active catalysts for liquid phase alkene epoxidation

Autor: Mark Crocker, Ruud H. M. Herold, A. Guy Orpen

Publikováno v: Chemical Communications. :2411-2412

Titanium silsesquioxane complexes [Ti(L)(R7Si7O12)], possessing tripodal geometry, represent models for heterogeneous titanosilicate catalysts; the new complexes are exceptionally active and selective catalysts for liquid phase alkene epoxidation rea

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e8e2868c99125a80e33ae988cc80e82a
https://doi.org/10.1039/a704969b

Zobrazit plný text záznamu

1H NMR spectroscopy of titania. Chemical shift assignments for hydroxy groups in crystalline and amorphous forms of TiO2

Autor: Munro Mackay, Mark Crocker, Antonio E. Wilson, C. A. Emeis, Alda M. Hoogendoorn, Ruud H. M. Herold

Publikováno v: Journal of the Chemical Society, Faraday Transactions. 92:2791

1 H magnetic-angle spinning (MAS) NMR measurements have been performed on a number of crystalline titanias, and on amorphous silica-supported titania and titania–silica, with the aim of measuring the characteristic proton chemical shifts of hydroxy

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::947e21a19e111cee9e0ab36051fada32
https://doi.org/10.1039/ft9969202791

Zobrazit plný text záznamu

Vyhledávací nástroje:

Upřesnit hledání