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

Abstract

Bin Liu 2 ( ), and Xiaoming Sun 1 ( ) 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 monolithic catalysts with a porous woodpile architecture were fabricated via extrusion-based three-dimensional (3D) printing (direct ink writing, DIW in brief) of aluminate-intercalated layered double hydroxide (AI-LDH) followed by low temperature calcination. The intercalation of aluminate in LDH is found crucial to tailor the M 2+ /Al 3+ ratio, integrate LDH nanosheets into monolithic catalyst, and enable the conversion of LDH to spinel at the temperature as low as 500 °C with high specific surface areas (> 350 m 2 /g). The rapid mass/heat transfer resulted from the versatile 3D network at macroscale and the highly dispersed and fully exposed active sites benefited from the porous structure at microscale endow the 3D-printed Pd loaded spinel MgAlmixed metal oxide (3D-AI-Pd/MMO) catalyst with excellent catalytic performance in semi-hydrogenation of acetylene, achieving 100% conversion at 60 °C with more than 84% ethylene selectivity.

Technical, economic, and environmental potential of glycerol hydrogenolysis: a roadmap towards sustainable green chemistry future

“…, single atom catalysts, high entropy alloys, and metal–organic frameworks) or adoption of additive manufacturing in catalyst fabrication to enhance the desired product selectivity and catalyst longevity. 44–46…”

“…For instance, the utilization of advanced materials (i.e., single atom catalysts, high entropy alloys, and metal-organic frameworks) or adoption of additive manufacturing in catalyst Sustainable Energy & Fuels fabrication to enhance the desired product selectivity and catalyst longevity. [44][45][46] (d) The potential for co-production of other valuable chemicals alongside 1,2-PDO, such as inter-renery sharing of different products from various glycerol valorization pathways (e.g. simultaneous production of lactic acid and 1,2-PDO or formic acid and 1,2-PDO), enhancing the overall protability of the plant and providing more diverse product offerings.…”

In Situ Impregnated Ni/Al2o3 Catalysts Prepared by Binder Jet 3d Printing Using Nickel Nitrate-Containing Ink

“…Several printing techniques from the plethora of AM technologies available nowadays have been applied for printing of predominantly monolithic catalyst geometries. Direct Ink writing (DIW/robocasting) or fused deposition modeling (FDM) are extrusion-based principles and most commonly used due to their relatively intuitive material design, especially regarding processing of metal oxide feedstock [23][24][25][26][27][28]. Powder-based techniques oftentimes require more detailed material and process development.…”