Novel open cell aluminum foams and their use as reactive support for zeolite crystallization |
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Authors: | S Barg C Soltmann A Schwab D Koch W Schwieger G Grathwohl |
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Affiliation: | 1.Keramische Werkstoffe und Bauteile,University of Bremen,Bremen,Germany;2.Lehrstuhl für Chemische Reaktionstechnik,University of Erlangen,Erlangen,Germany |
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Abstract: | Open cell aluminum (Al) foams are developed in this work by a novel direct foaming process in which a low concentrated alkane
phase is emulsified in a stabilized Al powder suspension. In this versatile technique, the porosity parameters are adjusted
during foaming of the emulsified suspensions and the final stability is achieved by a thermal treatment above the melting
temperature of Al. The thin oxide layers surrounding the Al particles and the ascertained percolation of the molten metal
are essential in this stage. The efficiency of the processing route is demonstrated with the essential requisites for successful
foaming and the final structural stability. Furthermore, open cell Al-foams/zeolite composites exhibiting a hierarchical porous
structure (nano- and macroscale) are produced by hydrothermal synthesis of Faujasite-like zeolite on the surface of the developed
Al-foams. Due to the advantageous properties of zeolite X in N2 adsorption, the application of the composites for separation of N2 from air is specially envisaged. |
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