Zirconium phosphate supported-silver nanoparticles for selective hydrogenation of nitrobenzene into azoxybenzene compounds

Qin, Yuxi; Jiang, Yongjun; Wei, Xinjia; Ma, Yue; Liao, Huiying; Peng, Qingpo; Dai, Sheng; Wang, Zhiqiang; Zhao, Xiuge; Hou, Zhenshan

doi:10.1039/d3nj00518f

Cited by 3 publications

(3 citation statements)

References 75 publications

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“…The ZrP crystal, featuring a sheet structure, is indicated by a blue arrow, and nano silver, exhibiting a black spherical shape, is indicated by a red arrow. Observable from the figure is the loading of nano-Ag particles onto the ZrP surface, bearing substantial morphological resemblance to the nano-Ag-ZrP detailed in existing literature (Qin et al, 2023;Yoshihara et al, 2021;Nocchetti et al, 2022). According to the TEM-Energy Dispersive Spectroscopy (TEM-EDS) element mapping analysis (Figures 2I-N) for P, O, Ag, and Zr elements, an intuitive reflection of each element's distribution within nano-Ag-ZrP is provided, illustrating a uniform dispersion of nano-silver.…”

Section: Characterization Of Nano-borne Ag-zrpmentioning

confidence: 70%

The effects of nano-silver loaded zirconium phosphate on antibacterial properties, mechanical properties and biosafety of room temperature curing PMMA materials

Chen,

Yan,

Sun

et al. 2023

Front. Cell. Infect. Microbiol.

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Polymethyl methacrylate (PMMA) frequently features in dental restorative materials due to its favorable properties. However, its surface exhibits a propensity for bacterial colonization, and the material can fracture under masticatory pressure. This study incorporated commercially available RHA-1F-II nano-silver loaded zirconium phosphate (Ag-ZrP) into room-temperature cured PMMA at varying mass fractions. Various methods were employed to characterize Ag-ZrP. Subsequently, an examination of the effects of Ag-ZrP on the antimicrobial properties, biosafety, and mechanical properties of PMMA materials was conducted. The results indicated that the antibacterial rate against Streptococcus mutans was enhanced at Ag-ZrP additions of 0%wt, 0.5%wt, 1.0%wt, 1.5%wt, 2.0%wt, 2.5%wt, and 3.0%wt, achieving respective rates of 53.53%, 67.08%, 83.23%, 93.38%, 95.85%, and 98.00%. Similarly, the antibacterial rate against Escherichia coli registered at 31.62%, 50.14%, 64.00%, 75.09%, 86.30%, 92.98%. When Ag-ZrP was introduced at amounts ranging from 1.0% to 1.5%, PMMA materials exhibited peak mechanical properties. However, mechanical strength diminished beyond additions of 2.5%wt to 3.0%wt, relative to the 0%wt group, while PMMA demonstrated no notable cytotoxicity below a 3.0%wt dosage. Thus, it is inferred that optimal antimicrobial and mechanical properties of PMMA materials are achieved with nano-Ag-ZrP (RHA-1F-II) additions of 1.5%wt to 2.0%wt, without eliciting cytotoxicity.

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Section: Characterization Of Nano-borne Ag-zrpmentioning

confidence: 70%

The effects of nano-silver loaded zirconium phosphate on antibacterial properties, mechanical properties and biosafety of room temperature curing PMMA materials

Chen,

Yan,

Sun

et al. 2023

Front. Cell. Infect. Microbiol.

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“…To illustrate the further role of MeOH in the oxidation of aniline, the study of the kinetic isotope effect (KIE) was performed by using MeOH or deuterated MeOD as the solvent . As shown in Figure , the introduction of d 1 -MeOD indeed led to a slower rate of aniline conversion.…”

Section: Resultsmentioning

confidence: 99%

“…To illustrate the further role of MeOH in the oxidation of aniline, the study of the kinetic isotope effect (KIE) was performed by using MeOH or deuterated MeOD as the solvent. 57 As shown in Figure 10, the introduction of d 1 -MeOD indeed led to a slower rate of aniline conversion. Because the conversion of AN to PHA was the rate-determining step, the reaction rate can be calculated by using eq 3 at a constant concentration of H 2 O 2 , in which R 0 and k represent the reaction rate and rate constant, respectively.…”

Section: Reaction Mechanismmentioning

confidence: 89%

Ionic Liquid-Regulated Titanium Oxo Clusters Catalyze Selective Oxidation of Anilines to Azoxybenzenes

Xu,

Liu,

Zhang

et al. 2024

Ind. Eng. Chem. Res.

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Selective oxidation of aniline is a highly effective way to produce azoxybenzene. Herewith, we constructed a series of ionic liquid-regulated titanium oxo clusters via a solvothermal method. The as-synthesized Ti oxo clusters were investigated by FT-IR, elemental analysis, ICP-AES, TGA, UV−vis, and highresolution transmission electron microscopy (HRTEM). The ionic liquid ([C 4 imC 2 COOH][H 2 PO 4 ], C 4 imC 2 COOH = 1-(2-carboxyethyl)-3-butyl imidazolium) played a crucial role not only in stabilizing titanium oxo clusters but also in enhancing the catalytic activity. Notably, the full conversion of aniline and excellent selectivity to azoxybenzene (more than 95%) were achieved with Ti oxo-[C 4 imC 2 COOH][H 2 PO 4 ] as the titanium oxo-cluster catalyst. Moreover, the reaction was carried out smoothly at room temperature without any other additives. Mechanistic studies proved that the reaction was proceeded through a catalytic mechanism rather than a radical route. Besides, the further characterization provided clear evidence that the Ti-OOH species is an active intermediate involved in aniline's selective oxidation. The hydrogen bond interaction between the −NH 2 group and C2proton of the imidazolium cation played an important role in producing N-phenylhydroxylamine, a key intermediate, which was then oxidized into nitrosobenzene. The condensation between N-phenylhydroxylamine and nitrosobenzene afforded azoxybenzene quantitatively. The superior catalytic performance as well as the green and mild reaction conditions make this catalytic system highly promising for the oxidative coupling of aromatic amines in further applications.

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Hydrogenation of Furfural to Furfuryl Alcohol over PdCu/zirconium Phosphonate with Metal and Lewis Acid Sites

Huang,

Xia,

et al. 2024

ChemistrySelect

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Hydrogenation of furfural to furfuryl alcohol under H2 and N2 atmosphere was studied over zirconium phosphonate (ZrPO)‐supported PdCu (PdCu/ZrPO) catalysts. The direct hydrogenation and transfer hydrogenation activities of PdCu metal active sites and the transfer hydrogenation activity of Zr4+−O2− Lewis acid‐basic sites were investigated, respectively. The size and the distribution of Cu particles could be adjusted by altering the P/Zr molar ratio. Bimetallic PdCu could enhance the acidity of the PdCu/ZrPO catalysts, and improve the ratio of Lewis/Brønsted acid, which led to an increase in the transfer hydrogenation activity of Lewis acid‐basic pairs. The electronic effect between Pd and Cu promoted furfural to absorb onto electron‐deficient Cu through η1(O)‐aldehyde configuration, which contributed to the direct hydrogenation and the transfer hydrogenation at metal active sites. Especially, the adsorption and dissociation of H2 in electron‐rich Pd were promoted, which significantly improved the direct hydrogenation activity.

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Zirconium phosphate supported-silver nanoparticles for selective hydrogenation of nitrobenzene into azoxybenzene compounds

Abstract: In this work, the zirconium phosphate (ZrP) supported Ag nanoparticles (NPs) catalysts have been constructed. The as-obtained catalyst was characterized thoroughly by XRD, HAADF-STEM and py-IR etc. The coordination interaction...

Cited by 3 publications

References 75 publications

The effects of nano-silver loaded zirconium phosphate on antibacterial properties, mechanical properties and biosafety of room temperature curing PMMA materials

The effects of nano-silver loaded zirconium phosphate on antibacterial properties, mechanical properties and biosafety of room temperature curing PMMA materials

Ionic Liquid-Regulated Titanium Oxo Clusters Catalyze Selective Oxidation of Anilines to Azoxybenzenes

Hydrogenation of Furfural to Furfuryl Alcohol over PdCu/zirconium Phosphonate with Metal and Lewis Acid Sites

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