Hierarchical Cu nanoparticle-aggregated cages with high catalytic activity for reduction of 4-nitrophenol and carbon dioxide
- Department of Bio & Nano Chemistry, Kookmin University, 861-1, Jeongneung-dong, Seongbuk-gu, Seoul, 02707 (Korea, Republic of)
- Department of Chemistry, Kongju National University, Chungnam, 32588 (Korea, Republic of)
Highlights: • Synthesizing a challenging structure, hierarchical ∼10 nm Cu NP-aggregated sub-micro cages. • Cu cages showed an excellent catalytic activity in the reduction of 4-nitrophenol by NaBH{sub 4}. • This is the first report on using a Cu NP-based heterogeneous catalyst for the hydrogenation CO{sub 2} to formate. - Abstract: Hierarchical ∼10 nm Cu nanoparticle (NP)-aggregated sub-micro cage catalysts (diameter: ∼800 nm) with a hollow interior and porous shell were prepared from SiO{sub 2} encapsulated Cu{sub 2}O nanoparticle aggregates (NPAs) using a facile and scalable method. The Cu cages were analyzed by field emission-scanning electron microscopy (FE-SEM), energy-dispersed X-ray (EDX), transmission electron microscopy (TEM), high-resolution TEM, selected area electron diffraction (SAED), X-ray diffraction (XRD) and Brunauer-Emmett-Teller (BET). Owing to the small primary Cu NPs and characteristic porous shell and hollow interior, the Cu cages showed an extraordinarily high catalytic activity in the reduction of 4-nitrophenol by NaBH{sub 4} in aqueous solution. The activity factor (K = 520 s{sup −1} g{sup −1}) is approximately 2.8 times greater than the previous highest K value of unsupported Cu catalysts. In addition, the excellent catalytic activity of the Cu cages in hydrogenation of CO{sub 2} to formate, with a TON value of 58 at 200 °C, was comparable to that of various noble metal-supported heterogeneous catalysts and surpassed the vast majority of homogeneous first-row transition metal catalysts.
- OSTI ID:
- 22803915
- Journal Information:
- Materials Research Bulletin, Vol. 100; Other Information: Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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