Abstract
Herein, the possibility of generating Raney‐Copper catalysts with high geometric complexity is demonstrated. For this, periodic open cellular structures (POCS) composed of a highly brittle Al–Cu alloy containing 29.4 at% copper are fabricated by selective electron beam melting (SEBM) for application in chemical reaction engineering. After selective leaching of aluminum in an NaOH solution, the POCS show a core–shell structure with a nanoporous copper surface layer and a solid core. The fabrication and dealloying processes as well as the microstructure are studied. Moreover, the SEBM‐processed Raney‐type copper catalysts show a high catalytic activity in methanol synthesis.
Highlights
The possibility of generating Raney-Copper catalysts with high geometric transfer capacity of classical fixed bed reaccomplexity is demonstrated
We demonstrated that Cu–Al Raney-type
During the selective electron beam melting (SEBM) preheating process, the top side of the powder bed was heated by the defocused electron beam
Summary
An inert gas atomized prealloyed Cu–70Al powder with a nominal composition of 29.4 at% copper, a balance of aluminum (ECKA Granules GmbH, Fürth, Germany), and a particle size distribution between 45 and 105 μm was used. According to the caliper measurements, the individual struts (Figure 1a) and POCS (Figure 1b) showed a strut thickness of 0.9 Æ 0.1 mm and 1.3 Æ 0.1 mm, respectively. Their surface roughness was measured using a LEXT-OLS4000 (Olympus) laser-scanning microscope and were found to be 35 Æ 1 μm (Ra). To perform proper imaging and energy-dispersive X-ray spectroscopy (EDS) measurements, a leached strut was broken (a). Www.aem-journal.com and glued to an electrically conductive sample holder instead of embedding it in a cold setting resin This was done to avoid contamination during grinding and polishing. The catalytic tests were performed at 250 C and 75 bar with a total volume flow of 300 mL minÀ1 and a stoichiometric mixture of CO and H2 (CO:H2 1⁄4 1:2)
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