Atomically precise Ag nanoclusters intercalated in zirconium pyrophosphate for efficient hydrogenation of nitroaromatics

Toward Active-Site Tailoring in Heterogeneous Catalysis by Atomically Precise Metal Nanoclusters with Crystallographic Structures

“…Besides Au NCs, Ag NCs have also been reported as catalysts for nitroarene hydrogenation; for example, Ag 74 (CCPh) 44 (NO 3 ) 2 was intercalated into α-zirconium phosphate (ZrP) through ion exchange, followed by thermal treatment, and the as-prepared catalyst exhibited activity of 223–456 h –1 and excellent recyclability. The ZrP not only stabilizes the NCs but also serves as the site for adsorption of nitroaromatics.…”

Very rapid synthesis of highly efficient and biocompatible Ag2Se QD phytocatalysts using ultrasonic irradiation for aqueous/sustainable reduction of toxic nitroarenes to anilines with excellent yield/selectivity at room temperature

“…As a result, the best catalytic activity was obtained using the Ag 2 Se QD phyto-catalyst (10 mg) and NaBH 4 (1 mmol) under green conditions (H 2 O, rt) which provided the product with excellent yield and selectivity (>99%). It should be noted that under these conditions, the reduction reaction was carried out more rapidly by the Ag 2 Se QD catalyst (∼1h) than previously reported similar reactions [28] , [29] , [70] , [71] , [72] . Thus, this phyto-nanocatalyst plays an important role in the green/environmentally friendly catalytic reduction with the excellent yield and selectivity.…”

“… NaBH 4 , H 2 O, rt 1–12 h 91–99 (Li et al, 2015) [71] (PNA-BIS-2) microgel-stabilized Ag NPs SDS, NiPAM, AAm, BIS, water, N 2 , 30 min, rt, and then 70 °C, 20 min APS, N 2 , 70 °C, 4.5 h dialysis: 5 days microgel, water, N 2 , rt, 30 min AgNO 3 (aq) , NaBH 4 , N 2 , rt, 1 h dialysis: 30 min 10–20 nm NaBH 4 , H 2 O, rt 3–9 h 75–95 (Begum et al, 2019) [28] Ag NPs-MPAT-1 SDS, TAA, TEMED, water, conc. HCl (12 N) APS, water, 1 h, then at 348 K, 3 days AgNO 3 , water, TRIS, 2 min NaBH 4 , 10 min 5) Template-free MPTA-1,TRIS-stabilized Ag-NPs, rt, 1 h 15–20 nm i -PrOH, NaOH, N 2 , 80 °C 5–12 h 81–98 (Salam et al, 2014) [72] Ag@C/ZrPP-500R ZrOCl 2 ·8H 2 O, reflux, H 3 PO 4 , 100 °C, 24 h and drying at 65 °C, 24 h AgNO 3 , ethanol, phenylacetylene, 1,3-bis(diphenyphosphino) propane, CH 2 Cl 2 NaBH 4 , ethanol, rt, 12 h α-ZrP, DMF, ultrasonic for 30 min Ag cluster ([Ag 74 (C≡CPh) 44 ](NO 3 ) 2 ), DMF, 100 °C, 5 h and drying (vacuum, 80 °C, 4 h) 750 °C (2 °C/min), N 2 , 3 h 500 °C, 1 h 8) N 2 , 10% H 2 , 300 °C, 2 h 1.0–2.0 nm H 2 (4 MPa), THF, 160 °C 1–2 h 94.5–100 (Gong et al, 2019) [70] Ag/Fe 2 O 3 nanocatalyst sodium salicylate, NaOH, Iron(III) nitrate, water, pH = 8, 3 h 200 °C, 72 h, washed (water and ethanol), extracted (acid–ethanol) ...…”

A Cationic Ru(II) Complex Intercalated into Zirconium Phosphate Layers Catalyzes Selective Hydrogenation via Heterolytic Hydrogen Activation

“…As illustrated in Figure 1a, the pattern of α-ZrP displayed three main strong diffraction peaks at 11.7°( interlayer distance of 7.6 Å), 19.8°and 24.9°, corresponding to (002), (110) and (112) planes of monoclinic α-ZrP (space group-P21/n, JCPDS-ISDD No.-70-0561), respectively. [59] It could be seen that a new peak at 5.9°emerged in the patterns of ex-ZrP_ 0.2 and ex-ZrP_0.4 samples while the peak at 11.7°remained but became weak. The appearance of the new peak (5.9°, 15.0 Å) revealed the partial exfoliation state, [60] which was due to intercalation of single layer of TBA into α-ZrP nanosheets in line with a slight increase of BET surface area (Table 1).…”