Shultz Lorianne R, Preradovic Konstantin, Ghimire Suvash, Hadley Hayden M, Xie Shaohua, Kashyap Varchaswal, Beazley Melanie J, Crawford Kaitlyn E, Liu Fudong, Mukhopadhyay Kausik, Jurca Titel
Department of Chemistry, University of Central Florida, Orlando, Florida, 32816, USA.
Department of Materials Science and Engineering, University of Central Florida, Orlando, Florida, 32816, USA.
Catal Sci Technol. 2022 Jun 21;12:3804-3816. doi: 10.1039/d1cy02313f. Epub 2022 Apr 1.
Contiguous metal foams offer a multitude of advantages over conventional powders as supports for nanostructured heterogeneous catalysts; most critically a preformed 3-D porous framework ensuring full directional coverage of supported catalyst, and intrinsic ease of handling and recyclability. Nonetheless, metal foams remain comparatively underused in thermal catalysis compared to more conventional supports such as amorphous carbon, metal oxides, zeolites and more recently MOFs. Herein, we demonstrate a facile preparation of highly-reactive, robust, and easy to handle Ni foam-supported Cu-based metal catalysts. The highly sustainable synthesis requires no specialized equipment, no surfactants or additive redox reagents, uses water as solvent, and CuCl(HO) as precursor. The resulting material seeds as well-separated micro-crystalline Cu(OH)Cl evenly covering the Ni foam. Calcination above 400 °C transforms the Cu(OH)Cl to highly porous CuO. All materials display promising activity towards the reduction of 4-nitrophenol and methyl orange. Notably, our leading CuO-based material displays 4-nitrophenol reduction activity comparable with very reactive precious-metal based systems. Recyclability studies highlight the intrinsic ease of handling for the Ni foam support, and our results point to a very robust, highly recyclable catalyst system.
与传统粉末相比，连续金属泡沫作为纳米结构多相催化剂的载体具有诸多优势；最关键的是，其预制的三维多孔框架可确保负载型催化剂的全方位覆盖，并且在处理和回收利用方面具有内在的便利性。尽管如此，与非晶碳、金属氧化物、沸石以及最近的金属有机框架等更传统的载体相比，金属泡沫在热催化中的应用仍然相对较少。在此，我们展示了一种简便的方法来制备高活性、坚固且易于处理的泡沫镍负载铜基金属催化剂。这种高度可持续的合成方法无需专门设备，无需表面活性剂或添加剂氧化还原试剂，以水为溶剂，并使用CuCl(HO)作为前驱体。所得材料以均匀分散的微晶Cu(OH)Cl形式附着在泡沫镍上。在400℃以上煅烧可将Cu(OH)Cl转化为高度多孔的CuO。所有材料对4-硝基苯酚和甲基橙的还原均表现出良好的活性。值得注意的是，我们领先的基于CuO的材料在4-硝基苯酚还原活性方面与非常活泼的贵金属基体系相当。回收利用研究突出了泡沫镍载体在处理方面的内在便利性，我们的结果表明这是一个非常坚固、高度可回收的催化剂体系。
