材料科学
煅烧
尖晶石
催化作用
化学工程
乙炔
铝酸盐
氢氧化物
多孔性
复合材料
冶金
有机化学
化学
工程类
水泥
作者
Ziming Yuan,Lu Liu,Wei Ru,Daojin Zhou,Yun Kuang,Junting Feng,Bin Liu,Xiaoming Sun
出处
期刊:Nano Research
[Springer Nature]
日期:2022-04-25
卷期号:15 (7): 6010-6018
被引量:7
标识
DOI:10.1007/s12274-022-4291-9
摘要
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 M2+/Al3+ 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 m2/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 MgAl-mixed 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.
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