Abstract:
A rotary kiln in which several tubes which can be heated independently are arranged in a drum. The rotary kiln can be used for the parallel thermal treatment of materials.
Abstract:
The invention relates to an evolutionary method for producing catalysts. In a first step (i), components are selected and added to a library of substances. Mixtures of these individual materials are then produced randomly by random selection. In the second step (ii), this first generation of catalysts produced is catalytically tested. Catalyst-optimised materials from step (ii) are physically/chemically characterised for reproducible production in step (iii) and form the basis for a second generation of catalysts. This second generation is produced gradually from the successful materials of the first generation using biological evolutionary methods such as crossing and mutation, and subjected to steps (ii) and (iii). For the second and subsequent iterations, the most successful catalysts of all the generations are taken as a basis in each case, the total number of said catalysts being 1 to 50 % of the catalysts of a generation. The iterations are continued until no further improvement is observed in the catalytic properties of the materials in terms of activity/selectivity, for the reaction concerned.
Abstract:
Catalyst systems consisting of supported or unsupported transition metal catalysts which have modifiers on the surface. The modifiers have sulphur-containing functionalities (G 0 ). In addition, the modifiers may have a spacer (Sp) and a Bronsted-basic, Bronsted-acidic or Lewis-basic functionality (G 1 ). The catalyst systems may be used for hydrogenation, reductive alkylation and reductive amination.
Abstract:
Process and device for the preparation of inorganic materials, in which salt solutions and solids are mixed with one another and a solid is precipitated out by addition of a further salt solution, the suspension is frozen and the solvent is removed. The solid can be investigated for its catalytic properties.
Abstract:
The invention relates to a method for evaluating the efficiency of solid catalysts of different compositions for a reaction network consisting of reactions, which proceed in parallel or in succession as well as in the gaseous state, in liquid phase or at the interface between the gas phase and liquid phase. The aim of the invention is to provide a method with which it is possible to predict catalyst efficiencies with different reaction conditions while using high-throughput screening. This is achieved by: conducting the experimental recording of specified data of the catalytic reactions of the reaction network; including this data in a kinetic calculation; determining kinetic data for the highest catalyst performances; conducting the experimental verification of the calculated kinetic data, and; by using the verified kinetic data in new, modified reaction conditions for the purpose of selecting the best catalyst under the corresponding reaction conditions.
Abstract:
The present invention relates to a catalyst comprising (a) a polymer, which has a weight-average molecular weight in the range of from 1000 g/mol – 100000 g/mol and which polymer comprises 50 wt-% - 99.9 wt-% of units derived from one or more non-functionalized monomeric units A, 0.1 wt-% - 50 wt-% of units derived from one or more functionalized monomeric units B, 0 wt-% - 30 wt-% of units derived from one or more cross-linking monomeric units C, wherein monomeric units A are selected from (meth)acrylates and monomers co-polymerizable with (meth)acrylates; wherein monomeric units B are selected from (meth)acrylates and monomers co-polymerizable with (meth)acrylates, which contain one or more phosphorous and/or nitrogen containing uncharged electron donors as coordinative groups; and wherein cross-linking monomeric units C are selected from compounds which comprise at least two olefinically unsaturated double bonds co-polymerizable with A and/or B; and (b) a catalytically-active metal compound that is bound to one or more phosphorous and/or nitrogen containing uncharged electron donors of said polymer. Furthermore, the invention relates to corresponding polymers of afore-mentioned catalyst, a process for producing the catalyst and the polymer as well as the use of the catalyst in homogeneous and/or heterogeneous catalysis.
Abstract:
Polyhedral oligomeric silsesquioxanes (POSS) linked ligand of the general formula (I): L [(R 1a ) n-1 (SiO 1,5 ) n R 2a ] k [(R 1b ) n-1 SiO 1,5 ) n R 2b ] | [(R 1C ) n-1 SiO 1,5 ) n R 2c ] m in which (R 1a,b,c ) n-1 (SiO 1,5 ) n is a polyhedral oligomeric silsesquioxanes (POSS) with n = 4, 6, 8,10, 12, 14, 16 or 18 and R 1a , R 1b ,R 1c is each independently selected from the group consisting of same or different branched or linear C 1 -C 20 alkyl chains, cyclo alkyl, C 1 -C 20 alkoxy, aryl, aryloxy, heteroaryl and arylalkyl groups, k, l, m is 0 or 1 provided that k+l+m ≥ 1, R 2a , R 2b , R 2c is a spacer that binds the polyhedral oligomeric silsesquioxane (POSS) to the ligand L and ligand L is an uncharged electron donor.
Abstract:
Process for preparing higher hydridosilanes of the general formula H-(SiH 2 ) n -H where n ≥ 2, in which - one or more lower hydridosilanes - hydrogen, and - one or more transition metal compounds comprising elements of transition group VIII of the Periodic Table and the lanthanides are reacted at a pressure of more than 5 bar absolute, subsequently depressurized and the higher hydridosilanes are separated off from the reaction mixture obtained.
Abstract:
Muffle furnace consisting of a furnace, a perforated plate at the base of the interior, a structure which divides the interior of the furnace into chambers; a further perforated plate beneath the cover of the furnace. It is used for the heat treatment of materials, a gas or gas mixture being fed before, during and/or after the heat treatment into the chambers through the perforated plate beneath the cover and being fed from the chambers through the perforated plate at the base.
Abstract:
Muffle furnace consisting of a furnace, a perforated plate at the base of the interior, a structure which divides the interior of the furnace into chambers; a further perforated plate beneath the cover of the furnace. It is used for the heat treatment of materials, a gas or gas mixture being fed before, during and/or after the heat treatment into the chambers through the perforated plate beneath the cover and being fed from the chambers through the perforated plate at the base.