Bimetallic (Au–Cu core)@(ceria shell) nanotubes for photocatalytic oxidation of benzyl alcohol: improved reactivity by Cu

Abstract

Supported bimetallic AuCu@CeO2 nanocomposites with high Cu-content demonstrate high catalytic activity, selectivity and stability for photocatalytic oxidation of benzyl alcohol.

Hollow Micro/Nanostructured Ceria‐Based Materials: Synthetic Strategies and Versatile Applications

“…[164] Hollow structures composed of tiny NPs or with nanosized thickness combine the merits from both nanoscale and microscale, which is very useful to overcome current challenges in this field. [167] Many other researchers discovered that hollow CeO 2 structures are efficient in photocatalytic detoxificatation of cyanide, [168] reduction of Hg, [169] as well as the degradation of various dye pollutants, such as methylene blue, [170] acid orange, [171] eosin yellow, [172] and Rhodamine B. The obtained NTs were about 15 ± 5 nm in inner diameter, 25 ± 10 nm in outer diameter, and a few micrometers in length.…”

“…facets Bimetallic Au-Cu@CeO 2 nanotube S BET = 92 m 2 g −1 ;Ce 3+ % = 40%; O vacancy % (Raman) = 30% Yield 15.9 mmol g −1 h −1 at full light; eight cycles without significant activity loss[167] Pd@CeO 2 hollow core-shellS BET = 53 m 2 g −1 ; V pore = 0.21 cc g −1Conversion 93%; no detectable loss for four cycles (take 4-nitrophenol as example) under visible light (λ > 420 nm) for 6 h wide dynamic range of 1.63 × 10 −13 m to 1.63 × 10 −8 ; detection limit 10 × 10 −13 BET = 47.31 m 2 g −1…”

Ag-Based Catalysts in Heterogeneous Selective Oxidation of Alcohols: A Review

“…A variety of studies dedicated to partial oxidation of aromatic alcohols features titania-based systems with such modifiers (or combination thereof) as CdS [157], ZnO [158], WO 3 [159], CeO 2 [160], Fe 3+ [161], vanadyl species [162], Ag [163], AgBr [164,165], Au [166], Pt, Rh or Ir [167]. A selection of recent works on the subject also mention gold catalysts on different supports such as hydrotalcite [168], niobium oxide perovskites [169], zeolites [170] or CeO 2 [171]. Some other composite catalysts are also mentioned such as Pt/Bi 2 WO 6 [172] or separate various bromide compounds [173,174].…”

Visible Light-Emitting Diode Light-Driven Cu0.9Fe0.1@RCAC-Catalyzed Highly Selective Aerobic Oxidation of Alcohols and Oxidative Azo-Coupling of Anilines: Tandem One Pot Oxidation–Condensation to Imidazoles and Imines

“…5 Among other oxidation reactions, oxidation of alcohols to carbonyl compounds has emerged as the fascinating area of research in the synthetic organic chemistry because of enormous applications of products in pharmaceutical/agro-chemical/fragrances/food/electronic-industries. 6−11 Over the period, various hybrid photocatalysts, for example, Pt–metal oxide 12 /Pt–MOF 13 /Pt–/Rh–/Ir–TiO 2 14 /Pt–, Au–, Pd–, Ag–/TiO 2 15 /Au/TiO 2 16 /Au/TiO 2 –SBA-15 17 /Au–WO 3 18 /Au–/Cu–CeO 2 19 /CsPbBr 3 –TiO 2 , 20 and FAPBr 3 –TiO 2 21 have been developed for clean oxidation of benzyl alcohols to corresponding aromatic aldehydes/ketones. However, the use of precious and costly heavy metals (e.g., Au, Pt, Pd, Ir, Rh, Pb, and so forth.…”