Abstract Considering the importance of sub-monolayer transition metal oxides supported on another oxide in many industrial processes, with help a DFT + U approach, we provide information structural and electronic properties pure M 2 O 3 mixed MM ′O monolayers ( , ′ = Ti, V, Cr, Fe) an α -Al (0001) support. With their structure prolongation alumina corundum lattice, have non-equivalent surface i...

The performances of alumina-supported cobalt catalysts strongly depend on Co/alumina interactions, that are poorly understood. In the present work, ?-alumina surfaces used as models polycrystalline support, to unravel their orientation dependent behavior by GI-EXAFS. CoII/?-alumina interactions in dried state investigated, with a resolution parallel versus perpendicular deposit formation. DFT c...

The preparation of C-iodo-N-Ts-aziridines with excellent cis-diastereoselectivity has been achieved in high yields by the addition of diiodomethyllithium to N-tosylimines and N-tosylimine-HSO2Tol adducts. This addition-cyclization protocol successfully provided a wide range of cis-iodoaziridines, including the first examples of alkyl-substituted iodoaziridines, with the reaction tolerating both...

OF DOCTORAL DISSERTATION HELSINKI UNIVERSITY OF TECHNOLOGY P.O. BOX 1000, FI-02015 TKK http://www.tkk.fi Author Leif Backman Name of the dissertation Supported Cobalt Catalysts—Preparation, Characterisation and Reaction Studies Manuscript submitted Jan 23, 2009 Manuscript revised May 7, 2009 Date of the defence June 2, 2009 Monograph Article dissertation (summary + original articles) Faculty Fa...

Selective excitations of specific vibronic modes in position space are realized in single naphthalocyanine molecules adsorbed on an ultrathin alumina film by a scanning tunneling microscope at low temperature. Distinct spatial distributions are imaged for the different vibronic modes, which are in accordance with spectra recorded over different points of the molecule and its orbital structure. ...

We report on a heat-induced transformation of the surface of α-alumina (0001) crystals which have a off-cut in the [1210] direction. Annealing the crystal causes the surface to transform into a regular array of (0001) and (1216) facets. The resultant faceted morphology represents the equilibrium state of the system. It is demonstrated that the average terrace periodicity is determined by the an...

The oxidative cracking of n-decane was investigated at millisecond contact times over platinum alumina washcoated monoliths a fuel-air equivalent ratio (Φ) 5. High valuable linear α-olefins were so produced through an autothermal way concomitantly with oxygenated compounds, CO, CO2, H2 and H2O. A fine identification reaction products coupled the study thermal phenomena occurring both active dea...

Catalyst activity and performance are the most important factors for selecting a catalyst in different processes. The Fischer-Tropsch synthesis is a very important synthesis that extensive action has been taken place to increase the activity of its catalysts in the recent century. Deactivation of the catalysts of the process is influenced by many factors, among which coking and sintering have c...

Nanoporous alumina membranes exhibit high pore densities, well-controlled and uniform pore sizes, as well as straight pores. Owing to these unusual properties, nanoporous alumina membranes are currently being considered for use in implantable sensor membranes and water purification membranes. Atomic layer deposition is a thin-film growth process that may be used to modify the pore size in a nan...

Um método simples e eficiente foi desenvolvido para a hidrocalcogenação de alquinos contendo um aceptor de Michael (éster, cetona e nitrila) com ânions fenilcalcogenolatos gerados in situ a partir do respectivo dicalcogeneto de difenila (Se, Te, S), usando hidreto de boro e sódio suportado em alumina e meio livre de solvente. Este método é geral e permite a obtenção de ésteres, cetonas e nitril...