nanostructured catalysts, 2005, p.341

[...]... homogeneous mixture of Ti and Ni “single-site” catalysts which generates oligomers from ethylene and then combines them into an ethylene copolymer.1 Alternately, complementary functions may be performed Nanostructured Catalysts, edited by S Scott et al Kluwer Academic/Plenum Publishers, 2003 1 2 Chapter 1 by catalysts derived from the same precursor at different times during the catalytic process, such as the... parameters influencing the catalytic performance of lanthanide(III) surface species, for example, in the hetero Diels-Alder and Meerwein-Ponndorf-Verley reactions Moreover, pore entrapment and surface Nanostructured Catalysts, edited by S Scott et al Kluwer Academic/Plenum Publishers, 2003 15 16 Chapter 2 confinement seem to be important factors which govern the stabilization and reactivity patterns of the... inspiration for the development of nanostructured catalysts5 and quantum-confined materials.6 Principally, nanostructuring of catalytic species can occur either through nano-sized bulk particles7 or via a nanoporous matrix, hosting the catalytic species as a so-called nanoreactor.8,9 Surface reactivity is the pivotal criterion of such cluster/nanophase materials Nanostructured bulk catalysts feature... performs simultaneous oligomerization and copolymerization of ethylene.3 In multicomponent catalysis, the presence of Ti promotes the activity of polymerization catalysts4 and enhances the stability of catalysts,5 although the nature of the Cr-Ti and V-Ti interactions is far from clear Methods for generating well-defined heterogeneous active sites incorporating multiple functionality are emerging In... hydrophobicity for substrate adsorption and subsequent conversion are emphasized by De Vos et al in Chapter 14 Enhanced hydrophobicity may be particularly advantageous for early transition metal supported catalysts, which are highly moisture-sensitive Siloxane cleavage was recently reported to be a minor pathway in the modification of a partially dehydroxylated silica surface (T=450°C) with 40 However,... residual surface hydroxyls.48 8 Chapter 1 Residual hydroxyl groups which persist after grafting of metal complexes on the silica surface have been blamed for deactivation of “site-isolated” supported catalysts, since aggregation can be mediated by the facile migration of surface protons.49-51 In cases where such mobility is not desired, it may be greatly impeded by cofunctionalization of the catalyst,... Herold, R H M; Orpen, A G.; Overgaag, M T A J Chem Soc., Dalton Trans 1999, 3791 Edelmann, F T.; S.; Fischer, A J Organomet Chem 2001, 620, 80 Rice, G L; Scott, S L Chem Mater 1998, 10, 620 64 65 Chapter 2 NANOSTRUCTURED RARE EARTH CATALYSTS VIA ADVANCED SURFACE GRAFTING Reiner Anwander Anorganisch-chemisches Institut, Technische Universität München, D-85747 Garching, Lichtenbergstraße 4, Germany Keywords:... lanthanides), nanostructuring, nano-sized particles, nanoporous materials, periodic mesoporous silica (PMS), lanthanide silylamides, surface organometallic chemistry (SOMC), organic/inorganic composite materials, catalysts, surface confinement, pore confinement, nanoenvironment, molecular oxo-surfaces Abstract: Mesoporous silicas of the M41S family are discussed as attractive host materials in catalysis and materials... absence of any insoluble by-products Various conceptual approaches to this novel heterogeneously performed silylamine elimination are presented for the lanthanide elements, which are promising components of nanostructured catalysts Particular emphasis is put on the application of conclusive methods of characterization of the hybrid materials, elaborating the importance of spectroscopic probe ligands and nitrogen... METAL COMPLEXES Susannah L Scott,* Eric W Deguns Centre for Catalysis Research and Innovation, Department of Chemistry, University of Ottawa, Ottawa ON Canada K1N 6N5 Keywords: silica, supported metal catalysts, active sites, siloxane cleavage, silanols, multifunctional catalysts Abstract: Supported metal catalysts containing more than one functionality can be created by routes involving simultaneous . organometallic species, or through various deposition procedures including electro, electroless and vapor deposition, or simple adsorption. These materials find important applications in catalysis, separation. Supports in Developing Silica- Immobilized Polymerization Catalysts 57 Robbert Duchateau Theoretical Models of Active Sites: General Considerations and Application to the Study of Phillips-Type. Cobalt-Substituted Aluminophosphate Catalysts and Their Catalytic Performance 195 213 231 257 277 297 311 329 Gopinathan Sankar and Robert Raja Catalytic Activity of Pt and Tungstophosphoric Acid Supported on MCM-41