Basf Se Corporation

Basf Se Ludwigshafen

Andrey Karpov

Frank Rosowski

Cornelia Katharina Dobner

Hartmut Hibst

Christian Walsdorff

Imme Domke

Friederike Fleischhaker

Marcel Kastler

Josef Macht

Christian Bartosch

Ulrich Hammon

Klaus Joachim Mueller-Engel

Richard Riggs

Veronika Wloka

Cathrin Alexandra Welker-Nieuwoudt

Sylke Haremza

Holger Borchert

Yuzhuo Li

Klaus Joachim Müller-Engel

Berend Eling

Marco Bosch

Ingolf Hennig

Thorsten Johann

Hagen Wilmer

Stefan Altwasser

Armin Lange De Oliveira

Michael Siemer

Hartwig Voβ

Catharina Horstmann

Christof Kujat

Valerie Andre

Klaus-Dieter Mohl

Alexander Traut

Simon Schambony

Mario Brands

Guido Wasserschaff

Joern Duwenhorst

Bastian Ewald

Juergen Zuehlke

Marco Oskar Kennema

Miguel Angel Romero Valle

Robert Schloegl

Joseph John Zakzeski

Carlos Lizandara Pueyo

Oliver Hammen

Lothar Weber

Nicolas Duyckaerts

Herbert Vogel

Robert Wengeler

Christine Schmitt

Lars Vicum

Christian Krausche

Jing Dreher

Gerhard Krennrich

Daniela Rieck

Sabine Schmidt

Cornelia Roeger

Michael Kraemer

Nina Blickhan

Christian Horn

Peter Eckerle

Radoslav Parashkov

Annettte Trunschke

Mark Eichelbaum

Bernd Bechtloff

Tina Petzold

Nadine Menning

Tim Jekewitz

Nadine Duerr

Alfons Drochner

Mauricio Grobys

Jens Luense

Rittinger Stefan

Tobias Weinland

Christian Almer

Jürgen ZÜHLKE

A process for producing ethylene oxide by gas-phase oxidation of ethylene, comprising: directing a feed comprising gaseous ethylene and gaseous oxygen through a packing of individual shaped catalyst bodies, under conditions conducive to obtain a reaction mixture containing at least 2.7 vol.-% of ethylene oxide, wherein each shaped catalyst body comprises silver deposited on a refractory support and is characterized by a content of at least 20 wt.-% of silver, relative to the total weight of the shaped catalyst body; a BET surface area in the range of 1.6 to 3.0 m/g; a first face side surface, a second face side surface and a circumferential surface with a plurality of passageways extending from the first face side surface to the second face side surface; and a uniform multilobed cross-section; and a longest direct diffusion pathway d, with 2being in the range of 0.7 to 2.4 mm, wherein the longest diffusion pathway d is defined as the shortest distance from the geometric surface of the shaped catalyst body to a point inside the structure of the shaped catalyst body for which point the shortest distance is the largest among all points. The process allows for increased activity and/or stability of the catalyst while maintaining or increasing selectivity at high productivity.

Process for producing ethylene oxide by gas-phase oxidation of ethylene

A shaped catalyst body for producing ethylene oxide by gas-phase oxidation of ethylene, comprising silver deposited on a porous refractory support, the shaped catalyst body having a first face side surface, a second face side surface and a circumferential surface, characterized by a content of at least 20 wt.-% of silver, relative to the total weight of the shaped catalyst body; a multilobe structure; a plurality of passageways extending from the first face side surface to the second face side surface, outer passageways being arranged around a central passageway with one outer passageway being assigned to each lobe, wherein neighboring outer passageways are arranged essentially equidistantly to each other and the outer passageways are arranged essentially equidistantly to the central passageway; a minimum wall thickness A between two neighboring passageways in the range of 0.6 to 1.3 mm; a minimum wall thickness B between each outer passageway and the circumferential surface in the range of 1.1 to 1.8 mm; and a BET surface area in the range of 1.6 to 3.0 m/g. The shaped catalyst bodies allow for a favorable balance between mechanical stability, pressure drop and selectivity. The invention also relates to a process for producing ethylene oxide by gas-phase oxidation of ethylene, comprising reacting ethylene and oxygen in the presence of a shaped catalyst body as defined above. The invention further relates to a process for preparing a shaped catalyst body as above, comprising i) impregnating a refractory support having a BET surface area in the range of 1.4 to 2.5 m/g with a silver impregnation solution; and ii) subjecting the impregnated refractory support to a calcination process; wherein steps i) and ii) are optionally repeated.

Catalyst for producing ethylene oxide by gas-phase oxidation

The present invention is directed to a shaped catalyst body for preparing ethylene oxide, which comprises at least silver, cesium and rhenium applied to an alumina support, wherein the alumina support comprises Si, Ca, and Mg in a defined amount. Furthermore, the present invention is directed to a process for preparing the catalyst according to the present invention and process for preparing ethylene oxide by gas-phase oxidation of ethylene by means of oxygen in the presence of a shaped catalyst body according to the present invention.

Catalyst for the oxidation of ethylene to ethylene oxide

What is described is a catalyst for preparation of an &#x3b1;,&#x3b2;-unsaturated carboxylic acid by gas phase oxidation of an &#x3b1;,&#x3b2;-unsaturated aldehyde, comprising a shaped support body with an active composition applied thereto, wherein the active composition coverage q is at most 0.3 mg/mm, where Q is the active composition content of the catalyst in % by weight and Sis the specific geometric surface area of the shaped support body in mm/mg. Also described are a process for preparing the catalyst and a process for preparing an &#x3b1;,&#x3b2;-unsaturated carboxylic acid by gas phase oxidation of an &#x3b1;,&#x3b2;-unsaturated aldehyde over a fixed catalyst bed comprising a bed of the catalyst. The catalyst, with constantly high conversion of acrolein, reduces overoxidation to COand increases the selectivity of acrylic acid formation.

Catalyst for preparation of an unsaturated carboxylic acid by gas phase oxidation of an unsaturated aldehyde

A process for preparing (meth)acrylic acid by heterogeneously catalyzed gas phase partial oxidation of (meth)acrolein over a multimetal oxide composition which comprises the elements Mo, V and W and is obtained by a hydrothermal preparation route, and the multimetal oxide composition obtainable by this preparation route.

Process for heterogeneously catalyzed gas phase partial oxidation of (meth)acrolein to (meth)acrylic acid

An eggshell catalyst consisting of a hollow cylindrical support body of length 2 to 10 mm, external diameter 4 to 10 mm and wall thickness 1 to 4 mm, and an eggshell, applied to the outer surface of the support body, of catalytically active oxide material of the general formula I,MoVWCuXXO&#x2003;&#x2003;(I)in which the variables are each defined as follows:

Eggshell catalyst consisting of a hollow cylindrical support body and a catalytically active oxide material applied to the outer surface of the support body

The present invention relates to a process for producing a layer comprising at least one semiconductive metal oxide on a substrate, comprising at least the steps of:

Thermally labile precursor compounds for improving the interparticulate contact sites and for filling the interstices in semiconductive metal oxide particle layers

Dispersion comprising functionalized metal oxide particles, polymerizable compounds and if appropriate a solvent and their use for stabilizing polymers.

Dispersions comprising functionalized oxidic nanoparticles

A chemical mechanical polishing (CMP) composition comprising a specific heteropolyacid Abstract A chemical-mechanical polishing (CMP) composition comprising: (A) inorganic particles, organic particles, or a mixture thereof, (B) a heteropolyacid of the formula HaXbPsMOyVzOc wherein X=any cation other than H 8&#x3c;y&#x3c;18 8&#x3c;z&#x3c;14 56&#x3c;c&#x3c;105 a+b=2c&#x2212;6y&#x2212;5(3+z) b&#x3e;0 and a&#x3e;0 (formula I) or a salt thereof, and, (C) an aqueous medium.

Chemical mechanical polishing (CMP) composition comprising a specific heteropolyacid

Process for producing semiconductive layers

The present invention relates to a process for the preparation of nanoparticulate zinc oxide in the form of aqueous suspensions or in the form of pulverulent solid. Furthermore, the invention relates to the use of zinc oxide particles and suspensions prepared in this way in cosmetic sunscreen preparations, as stabilizer in plastics, in paints, in coatings and as antimicrobial active ingredient.

Process for the preparation of nanoparticulate zinc oxide

A catalyst for the gas phase oxidation of organic hydrocarbons comprises a multielement oxide which comprises at least one transition meal such as vanadium, wherein the catalyst has a charge transport activation energy Eat a temperature of 375 to 425&#xb0; C. of less than 0 kJ/mol. The catalyst serves for preparation of maleic anhydride.

Gas phase oxidation catalyst with low charge transport activation energy

Process for the preparation of modified ZnO particles in which a zinc salt and a base are mixed in a polar solvent and, if appropriate after the precipitation of a precipitation product, the polar solvent is removed and a residue is obtained, where the residue is taken up in a nonpolar solvent, surface-active substances are added, optionally further effect substances are added and then the modified ZnO particles are separated off from further by-products. Materials such as plastics, coatings or paints comprising modified ZnO particles. Methods for the incorporation of modified ZnO particles into materials, where the modified ZnO particles are incorporated into the materials in the form of dispersions or suspensions. Use of modified ZnO particles for protecting material against the effect of light, heat, oxygen or free radicals, as catalysts, for semiconductive films or cosmetic applications.

Modified zinc oxide particles

The present invention relates to particles which have been modified by a modifier and a dispersion medium comprising the modified particles. The surface-modified metal, metal halide, metal chalcogenide, metal nitride, metal phosphide, metal boride or metal phosphate particles or mixtures thereof have an average particle diameter of from 1 to 500 nm and their surface has been modified by one or more modifiers of the formula (I) (II) and (III) 

Modified particles and dispersions comprising these

Mo-, Bi- and Fe-comprising multimetal oxide compositions of the general stoichiometry I,MoBiCoFeKSiO&#x2003;&#x2003;(I),

Mo-, Bi- and Fe-comprising multimetal oxide compositions

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Mannheim, Germany

Andrey Karpov