Roger Gläser
The Condensed Matter & Surface Sciences Colloquium Series presents Roger Gläser of Leipzig University on “Heterogeneous Catalysis in Nanopores: The Benefit of Hierarchical Pore Systems” on Thursday, March 26, at 4:10 p.m. in Walter Lecture Hall 245.
Abstract: Nanoporous catalysts are applied in a broad range of chemical conversions. Often, the high specific surface area and the confined pore space are utilized to achieve high activity and selectivity. However, low catalyst effectiveness factors may result, if mass-transfer limitations exist, e.g., due to large substrate molecules. Additional pore systems with larger dimensions in the macro- and mesoporous range may, thus, help to increase accessibility and mass-transfer to and away from the catalytically active sites within nanoporous catalysts. This presentation will highlight two examples of nanoporous catalytic systems demonstrating the beneficial effect of an additional system with larger pores. In the first example, titanium silicalite-1 (TS-1)-based catalysts with additional mesopore systems are applied for the epoxidation of fatty acid methyl esters (FAME) with hydrogen peroxide in the liquid phase. The second example deals with the selective catalytic reduction of NOx over monolithic mixed oxide V2O5/TiO2-catalysts. The results provide experimental proof for increased reaction rates in the presence of a combined meso-/macropore system over a purely mesoporous catalyst.
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