Oliver Christian Gobin

Oliver Christian Gobin
BASF | BASF

Dr. rer. nat. Dipl.-Ing.

About

17
Publications
765
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659
Citations
Citations since 2016
0 Research Items
314 Citations
201620172018201920202021202201020304050
201620172018201920202021202201020304050
201620172018201920202021202201020304050
201620172018201920202021202201020304050

Publications

Publications (17)
Article
The transport and separation of mixtures between benzene and p-xylene in pellets prepared by pressing of ZSM-5 powder and a dense supported (crystalline) Silicalite-1 membrane were compared to isolated ZSM-5 crystallites. The kinetics of the transport in the pressed pellet and the grown membrane determined in a Wicke-Kallenbach cell (313-403 K; par...
Article
Transport processes of n-hexane and mesitylene in circularly ordered mesoporous silica fibers have been investigated. Combining theoretical calculations based on the complex hierarchical structure with experimental results from frequency response experiments, three well-defined pathways for the transport pathways of molecules in the ordered mesopor...
Article
The remarkable differences in the guest diffusivities in nanoporous materials commonly found with the application of different measuring techniques are usually ascribed to the existence of a hierarchy of transport resistances in addition to the diffusional resistance of the pore system and their differing influence due to the differing diffusion pa...
Article
The role of the surface modification on the transport properties of nanosized HZSM-5 particles was investigated by the analysis of the sorption kinetics of hexane isomers. The rate of diffusion is enhanced by this modification, if the initial adsorption is the limiting step, i.e., for n-hexane, 2-methylpentane, and 3-methylpentane. If the intracrys...
Article
Adsorption of n-alkanes has been studied in the industrially relevant zeolites H-FAU, H-BEA, H-MOR, and H-ZSM-5 combining QM-Pot(MP2//B3LYP) with statistical thermodynamics calculations and assuming a mobile adsorbate. In H-ZSM-5, adsorption at the intersection site with the hydrocarbon chain extending in the straight channel (SC+I) as well as in t...
Article
The diffusion of alkyl-substituted aromatic molecules in two H-ZSM5 samples consisting of very small (< 100 nm) and large (similar to 3-4 mu m) primary particles was investigated by means of the frequency response method. Analysis of the experimental data in combination with the theoretical modeling of the complete transport network shows that the...
Article
The diffusion of alkyl-substituted aromatic molecules in H-ZSM-5 was investigated by means of the frequency response method decoupling particle size effects and intracrystalline diffusion. For zeolite crystals above 5 mu m average diameter, the transport in the zeolite pores exerts a significant effect on the overall transport causing anisotropic d...
Article
Two genetic algorithms for the single- and multiobjective design of combinatorial experiments were applied to the optimization of a solid catalyst system active in the selective catalytic oxidation of propane to propylene. The two different optimization strategies, namely, the single objective optimization of the yield and the multiobjective optimi...
Article
Fast, time-resolved infrared spectroscopy was utilized to determine the transport and sorption properties of benzene, toluene, and p-xylene oil a series of zeolites with increasing degree of surface modification. Postsynthetic modification of H-ZSM5 with a mesoporous silica overlayer generates novel hierarchical materials. which significantly incre...
Article
Catching molecules: When the surface of zeolite HZSM-5 (see picture, red) is modified by amorphous SiO2 layers (gray), increased surface roughness results. The mesopores in the rough SiO2 layer funnel benzene molecules into the micropores of the zeolite, thus increasing sorption rates for benzene at the acidic hydroxy groups by a factor of two. The...
Article
Genetic algorithms are widely used to solve and optimize combinatorial problems and are more often applied for library design in combinatorial chemistry. Because of their flexibility, however, their implementation can be challenging. In this study, the influence of the representation of solid catalysts on the performance of genetic algorithms was s...
Article
A high-throughput approach, aided by multi-objective experimental design of experiments based on a genetic algorithm, was used to optimize the combinations and concentrations of a noble metal–free solid catalyst system active in the selective catalytic reduction of NO with C3H6. The optimization framework is based on PISA [S. Bleuler, M. Laumanns,...
Article
Mesostructured silica materials of SBA-16 type were synthesized under varying conditions affecting the pore size distribution. The alpha(s)-plot method allows us to identify two populations of intrawall pores and measure their respective specific volumes. A semiquantitative treatment of these data yields an estimate for the intrawall pore radius. T...
Article
In this Part 2 of the present work, the diffusivities of n-heptane, cumene, and mesitylene in the SBA-16 silica samples described in Part I have been measured by the zero length column (ZLC) method. A comparison is made between the diffusivities and diffusion apparent activation energies in these materials and in a series of SBA-15 samples of simil...

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