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The main methods for the design and preparation of single-site heterogeneous catalysts on inorganic oxide supports are described and reviewed. Catalytically active metal sites can be either introduced into the framework of porous... more
The main methods for the design and preparation of single-site heterogeneous catalysts on inorganic oxide supports are described and reviewed. Catalytically active metal sites can be either introduced into the framework of porous materials via direct synthesis or added to a pre-existing support by post-synthesis techniques. Particular attention is paid to selected examples where the geometry, the nature and the chemical surroundings of the active single site is a key factor to obtain catalytic systems with enhanced chemo-, regio-and stereoselectivity. The ever-increasing capabilities of 'nanoarchitecture' at molecular level enable chemists to build ideal catalysts for the sustainable transformation of bulky and high added-value molecules.
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The preparation of a new amorphous mesoporous silica-titania (MST) is here reported. Following a modification of the standard procedure employed in the preparation of TS-1, a material showing a narrow pore size distribution in the... more
The preparation of a new amorphous mesoporous silica-titania (MST) is here reported. Following a modification of the standard procedure employed in the preparation of TS-1, a material showing a narrow pore size distribution in the mesopore region (ca. 3 nm mean pore diameter) is obtained. The catalytic features, tested in the epoxidation of a series of unsaturated terpenic alcohols, were compared with those of an ordered mesoporous material as Ti-containing MCM-41. MST displayed mainly a higher activity than [Ti]-MCM-41 and a progressive increase in epoxidation rate was observed passing from bishomoallylic to allylic alcohols. Under these conditions, a global improvement in alkene conversion was achieved using methylacetate as solvent, without a remarkable loss in epoxide selectivity. During repeated recycles no significant changes in both catalytic performances and active metal content were recorded.
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An operando study of CO oxidation by Ce0.5Zr0.5O2 catalysts under dynamic conditions was performed using a prototype gas flow DRIFTS reaction chamber coupled with a MS. Previous studies conducted under oscillating CO/O2 feedstream... more
An operando study of CO oxidation by Ce0.5Zr0.5O2 catalysts under dynamic conditions was performed using a prototype gas flow DRIFTS reaction chamber coupled with a MS. Previous studies conducted under oscillating CO/O2 feedstream conditions, allowed the identification of carbonates as the C-containing storage species on the catalyst surface, with their decomposition being the origin of CO2 evolution dynamics during O2
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Cluster-derived FeIr/MgO catalysts prepared from [Et4N]2[Fe2Ir4(CO)16] and [Et4N]2[Fe2Ir2(CO)12] exhibit high activity in methanol synthesis from CO + H2. The catalyst performance improves significantly upon raising the Fe:Ir ratio in the... more
Cluster-derived FeIr/MgO catalysts prepared from [Et4N]2[Fe2Ir4(CO)16] and [Et4N]2[Fe2Ir2(CO)12] exhibit high activity in methanol synthesis from CO + H2. The catalyst performance improves significantly upon raising the Fe:Ir ratio in the precursor from 2:4 to 2:2; with the latter sample, at 488–523 K and 6.1 MPa, methanol productivities up to 100 mol/molir h are obtained with selectivity around 90%. Preliminary extended
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... 1 I , 80333 Miinchen, Germany Horacio Treviiio, 2. Conrad Zhangt and WMH Sachtler V. N. lpatieff Laboratory, Center for Catalysis and Surface Science, Departments ... t Present address : Catalytic System Division, Johnson Matthey, 456... more
... 1 I , 80333 Miinchen, Germany Horacio Treviiio, 2. Conrad Zhangt and WMH Sachtler V. N. lpatieff Laboratory, Center for Catalysis and Surface Science, Departments ... t Present address : Catalytic System Division, Johnson Matthey, 456 Devon Park Drive, Wayne, PA 19087, USA ...
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The one-step transformation of (+)-citronellal into (-)-menthol has been realised with yield ∼90% and stereoselectivity up to 80% under mild conditions in the presence of Cu/SiO2 by exploiting the presence of acidic and hydrogenation... more
The one-step transformation of (+)-citronellal into (-)-menthol has been realised with yield ∼90% and stereoselectivity up to 80% under mild conditions in the presence of Cu/SiO2 by exploiting the presence of acidic and hydrogenation sites on the catalyst surface, the unusual reducibility of an olefinic bond under these conditions and the chemoselectivity of the process.
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... Dipartimento di Scienze CC, FF, MM, Università degli Studi dell'Insubria, Via Valleggio 11, 22100 Como, Italy. Rinaldo Psaro, Achille Fusi, and Renato ... the active sites are probably formed by two copper centers with a favorable... more
... Dipartimento di Scienze CC, FF, MM, Università degli Studi dell'Insubria, Via Valleggio 11, 22100 Como, Italy. Rinaldo Psaro, Achille Fusi, and Renato ... the active sites are probably formed by two copper centers with a favorable geometric arrangement for the N−N bond formation ...
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Research Interests: Materials Science, Analytical Chemistry, Microfluidics, Mass Spectrometry, Heat Transfer, and 12 moreCatalyst, Gas Chromatography, High Temperature, Infrared, Fourier Transform spectroscopy, Zirconia, Design and Development, Plug Flow Reactor, Cell Wall, Infrared Spectrometry, Prototype, and Diffuse Reflection
... Dominique Roberto,*9+ Elena Cariati,? Rinaldo Psaro,J: and Renato Ugot Dipartimento di Chimica Inorganica, Metallorganica e Analitica and Centro CNR, Universita di Milano, Via Venezian, 21, 20133 Milano, Italy ... 1993, 35, 261. (7)... more
... Dominique Roberto,*9+ Elena Cariati,? Rinaldo Psaro,J: and Renato Ugot Dipartimento di Chimica Inorganica, Metallorganica e Analitica and Centro CNR, Universita di Milano, Via Venezian, 21, 20133 Milano, Italy ... 1993, 35, 261. (7) Tanaka, K; Watters, K. L.; Howe, RFJ Cutal. ...
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Research Interests: Chemical Engineering, Catalysis, Kinetics, Nuclear Magnetic Resonance, PHOTOELECTRON SPECTROSCOPY, and 12 moreHeterogeneous Catalysis, Carbon Monoxide, Silica, Infrared, Silicon Oxide, Fourier transform, Infrared spectra, Surface Properties, Temperature Control, Chemical Reaction, Catalytic Activity, and X Ray Spectroscopy
Specific studies carried in Milan laboratory in the application of metal carbonyl clusters to preparation of supported catalysts are reviewed. Examples are reported of catalysis by heterogeneous organometallic surface species, such as... more
Specific studies carried in Milan laboratory in the application of metal carbonyl clusters to preparation of supported catalysts are reviewed. Examples are reported of catalysis by heterogeneous organometallic surface species, such as 1-butene isomerisation catalysed by silica-anchored osmium carbonyl species, or of catalysis by very small metal particles produced under catalytic conditions, such as ethylene hydroformylation using silica supported [Rh12(CO)30]2−