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Speaker
Hannes Richter
Fraunhofer Institute for Ceramic Technologies and Systems, Germany
Biography

Hannes Richter is Head of the Department of “Nanoporous Membranes”. For his thesis on ceramic nanofiltration membranes (1998), he received the Bernhard-von-Cotta Award of the Freiberg University. He is experienced in amorphous membranes for 20 years and in zeolite and carbon membranes for more than 10 years. For the development of NaA-membranes and its scaling-up in to an industrial level, he received the Exceptional price of “Junior Scientist Award” competition at Materialsweek 2004, the “Innovation Award Middle Germany 2008 - Cluster Energy and Environment” and “Innovation Award Energy 2009” of the Society for the Promotion of Renewable Energy. For the development of ceramic nanofiltration membranes with a cut-off of 200 Da, he won the “Fraunhofer Award 2017”. He is the author of about 38 papers, gave more than 70 lectures in national and international congresses, thereof 26 invited presentations and is inventor of 8 patents.

Abstract

With a lattice plane distance in the range of the kinetic diameter of small gas molecules, carbon is an interesting material for membranes. To overcome problems of low mechanical stability, thin carbon layers (<1 µm thickness) were prepared inside mechanical stable ceramic support tubes by coating with organic precursor solutions, drying, cross linking and pyrolysing in inert atmosphere. Lattice plane distances of 0.4 nm were measured by electron diffraction. A high H2-permeance of around 5 m³/(m²?h?bar) and nearly no permeation for bigger molecules of >4 nm diameter giving evidence for a mole sieving behavior. Nearly pure H2 of >99% was separated through the membranes by mixed gas measurements in H2/C3H8 mixtures at temperatures up to 300°C and pressure up to 10 bar. By intercalation of hetero atoms, the properties were transformed to an adsorption selective mechanism giving CO2-selective carbon membranes. The membranes were scaled up to 0.5 m long membrane elements and successfully tested in a side stream of a commercially used biogas fermenter. A pore condensing mechanism can be used for the separation of H2O from hot gas streams. Infinite high selectivities for mixtures of water with gases like N2, CO2, CH4 and H2 were measured at 280°C and 11 bar. A robust membrane performance was found in first tests of in-situ water separation from methanization of CO2 and H2.

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