Andreas Feller

Andreas Feller
CS CLEAN SOLUTIONS AG

Dr. rer. nat.

About

14
Publications
4,602
Reads
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656
Citations
Additional affiliations
January 1999 - January 2003
Technische Universität München
Position
  • PhD Student
Description
  • PhD Thesis on Solid Acid Catalyzed Isobutane/Butene Alkylation
June 1997 - February 1998
University of Cape Town
Position
  • Student
Description
  • Diploma thesis on Fischer-Tropsch Catalysts
October 1991 - March 1998
Karlsruhe Institute of Technology
Position
  • Student
Description
  • Studium Verfahrenstechnik (Chemical engineering)

Publications

Publications (14)
Article
The effect of zirconium addition to the catalyst formulation of Co/SiO{sub 2} Fischer-Tropsch catalysts was investigated. With increasing zirconium content the strong interaction between silica and cobalt is reduced and a somewhat weaker cobalt-zirconium interaction is observed. Therefore the degree of reduction of catalysts, which were reduced at...
Article
Well-characterized examples of the large-pore zeolites X and Y in their acidic form were explored as catalysts for isobutane/butene alkylation in order to understand the principal requirements for successful solid acid catalysts. The materials were tested in a continuously operated stirred tank reactor under industrially relevant conditions. A high...
Article
The deactivation of rare-earth-exchanged zeolite X as catalysts in isobutane/2-butene alkylation between 40 and 130 °C was studied. The deactivated samples and the isolated deposits were analyzed by a range of techniques, including for the first time (matrix assisted) laser desorption/ionization time-of-flight mass spectroscopy (MALDI-TOF MS, LDI-T...
Article
Recently developed mechanistic and technological concepts concerning the isobutane/butene alkylation reaction on liquid and solid acids are addressed. Differences and similarities between the reactions of alkenes and alkanes with these acids are emphasized. Hydride transfer is shown to be the important step for high catalyst productivity and produc...
Article
This contribution is an in-depth review of chemical and technological aspects of the alkylation of isobutane with light alkenes, focused on the mechanisms operative with both liquid and solid acid catalysts. The differences in importance of the individual mechanistic steps are discussed in terms of the physical-chemical properties of specific catal...
Patent
A catalyst for acid-catalyzed hydrocarbon conversions, in particular for the alkylation of olefins with isoparaffins, containing a crystalline zeolite with an SiO2—Al2O3 molar ratio of <10, the alkali cations of which are at least partially replaced by H+ ions and/or polyvalent cations, the residual concentration of alkali cations amounting to less...
Article
The influence of the activation temperature on the physicochemical properties and catalytic activity of La-X zeolites for isobutane/cis-2-butene alkylation was investigated. Under optimal activation conditions, molecularly adsorbed water was detected by in situ IR and 1H MAS NMR spectroscopy, as well as temperature programmed desorption. Bridging h...
Article
The acid sites generated at different steps during the preparation of La-H-X zeolites were characterized by physicochemical methods. The resulting materials were tested in isobutane/cis-2-butene alkylation in a continuously operated stirred tank reactor, under industrially relevant conditions.The concentration and strength of acid sites depend subt...
Article
This contribution is an in-depth review of chemical and technological aspects of the alkylation of isobutane with light alkenes, focused on the mechanisms operative with both liquid and solid acid catalysts. The differences in importance of the individual mechanistic steps are discussed in terms of the physical–chemical properties of specific catal...
Article
The catalytic chemistry of a new process for alkylation of iso-butane with n-butene with zeolite based solid acid catalysts is described. The Brønsted acid site concentration in the zeolite catalysts is high, while the Lewis acid site concentration is low. The catalysts show high stability against deactivation by coking. In order to retard coking f...
Article
Full-text available
Die Isobutan/2-Buten Alkylierung wurde an Lanthan ausgetauschtem Zeolith X in einem Rührkesselreaktorsystem untersucht. Katalysatoren mit hoher Konzentration an starken Brønsted-Säurezentren und hohem Brønsted/Lewis Säurezentrenverhältnis zeigten eine längere katalytische Lebensdauer als Proben mit niedrigem Verhältnis. Die Isobutan Selbstalkylieru...
Article
Isobutane/alkene alkylation is reviewed with respect to recent process developments based on liquid and solid acid catalysts. The reaction mechanism and its consequences for both liquid and solid acid based processes is briefly discussed. Established liquid acid catalyzed processes are introduced followed by the description of new processes based o...
Article
The alkylation of isobutane with cis-2-butene on H-BEA, H-FAU and H-EMT catalysts was studied in a well-mixed continuously operated tank reactor. All the catalysts selectively catalyzed alkylation. Catalyst stability correlated directly with the concentration of Brönsted acid sites of the catalysts. The changes in the octane isomer distribution are...
Article
Alkylation of isobutane with ethene and propene was studied over an H-BEA catalyst in a well-stirred reactor. Under similar conditions of space velocity and paraffin-to-olefin feed ratio, lower initial olefin conversions were observed with ethene or propene than those reported earlier for butene. The sole presence of saturated hydrocarbons indicate...

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