3D printed hierarchical spinel monolithic catalysts for highly efficient semi-hydrogenation of acetylene

Porous monolithic catalysts with high specific surface areas, which can not only facilitate heat/mass transfer, but also help to expose active sites, are highly desired in strongly exothermic or endothermic gas-solid phase reactions. In this work, hierarchical spinel a porous woodpile architecture were fabricated via extrusion-based three-dimensional (3D) printing (direct ink writing, DIW brief) of aluminate-intercalated layered double hydroxide (AI-LDH) followed by low temperature calcination. The intercalation aluminate LDH is found crucial tailor the M2+/Al3+ ratio, integrate nanosheets into catalyst, and enable conversion at as 500 °C areas (> 350 m2/g). rapid mass/heat transfer resulted from versatile 3D network macroscale dispersed fully exposed sites benefited structure microscale endow 3D-printed Pd loaded MgAl-mixed metal oxide (3D-AI-Pd/MMO) catalyst excellent catalytic performance semi-hydrogenation acetylene, achieving 100% 60 more than 84% ethylene selectivity.