Controllable synthesis of Pd@ZIF-L catalysts by an assembly method

Jiang, Hong; Xue, Songlin; Liu, Yefei; Chen, Rizhi; Xing, Weihong

doi:10.1039/c6ra00909c

Cited by 12 publications

(6 citation statements)

References 43 publications

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“…Compared to the XRD patterns of Pd/ GO and GO (figure S2(a)), the peak of GO at 9.5° or 11.5° is not clearly observed from those of Pd/ZG-80, Pd/ZG-80-T and Pd/ZG-80-M, which can be attributed to the low content and/or the exfoliation/high dispersion of GO in the composites [32,36,37]. Notably, no obvious characteristic Pd peaks are observed in the XRD patterns of all samples, which can be due to the low concentration and/or small size of Pd NPs [30]. The existence and distribution of Pd NPs can be confirmed by other characterizations such as TEM, XPS, ICP and EDS (figures 1 and S1-3 and table 1).…”

Section: Resultsmentioning

confidence: 82%

Pd-ZIF-L-GO ternary nanolaminates for enhanced heterogeneous catalysis

et al. 2019

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A novel sheet-on-sheet Pd-ZIF/GO (Pd/ZG) catalyst is synthesized by constructing ZIF-L with GO and PVP-Pd nanoparticles (NPs) via a facile in situ method. The in situ introduction of GO promotes the formation of ZIF-L, leading to a higher yield of Pd/ZG, about three times higher than Pd/ZIF-L. We ascribe this to the possible interaction of the oxygen-containing groups on the GO surface with the Zn2+ cations in ZIF nodes and the PVP wrapped on the Pd surface, resulting in the formation of sheet-on-sheet Pd-ZIF/GO with good Pd dispersion. The Pd/ZG shows superior catalytic performance in the reduction of nitroarenes, and its turnover frequency (TOF) value is five times higher than Pd/ZIF-L. The superior catalytic activity can be ascribed to the uniformly dispersed tiny Pd NPs between ZIF-L and GO nanosheets, fast mass transfer in porous structure, and excellent electron conductivity due to strong interactions among ZIF-L, GO and PVP-Pd. These findings provide new opportunities for rational design of catalysts and their applications in the reduction of nitroarenes, important processes for industrial synthesis of pesticides, dyes, medicines, etc.

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Section: Resultsmentioning

confidence: 82%

Pd-ZIF-L-GO ternary nanolaminates for enhanced heterogeneous catalysis

et al. 2019

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“…Treatment temperature can significantly affect the microstructure and properties of materials. Jiang et al 27 demonstrated that the synthesis temperature had remarkable effects on the particle size, crystal shape, and morphology of the catalyst during the preparation of Pd@ZIF-L. With the increase of synthesis temperature, the particle size of the catalyst increased, the morphology changed from a leaf shape to a rod shape and a sphere shape, and the phase transition was observed at a high temperature. Tsai et al 28 reported that the synthesis temperature had an obvious influence on the specific surface area and particle size of ZIF-8.…”

Section: Introductionmentioning

confidence: 99%

Controllable Synthesis of Pd-ZIF-L-GO: The Role of Drying Temperature

Zhou

Liu

Jiang

et al. 2021

Ind. Eng. Chem. Res.

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The design and synthesis of metal–organic framework/graphene oxide (MOF/GO) composites are vital for their applications in energy, adsorption, sensing, supercapacitors, and catalysis. How to achieve high-performance MOF/GO composites still remains a great challenge. Herein, a simple strategy is proposed by adjusting the drying temperature to regulate the structural properties of Pd-ZIF-L-GO catalysts (Pd/ZG-X, where X indicates the drying temperature in vacuum and ZIF refers to the zeolitic imidazolate frameworka subclass of the MOF) and their catalytic performance in the reduction of nitroarenes. The as-prepared Pd/ZG-150 catalyst has high specific surface area, high degree of defects, small Pd particle size, and high pyrrolic N content, contributing to the highest catalytic activity with 100% conversion of p-nitrophenol (4-NP) to p-aminophenol (4-AP), which is 1.4 times higher than that of Pd/ZG-50. Pd/ZG-150 has good reusability during six reaction cycles. Furthermore, Pd/ZG-150 also exhibits the highest catalytic activity in the hydrogenation of o-nitrophenol, p-nitrobenzoic acid, and p-nitrotoluene. These findings will aid the development of high-performance MOF/GO composites.

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“…XRD (Figure a) and FESEM (Figure c,d) characterizations were used to study the morphology and structure of these Pd@ZIF catalysts. The diffraction peaks of Pd@ZIF-L and Pd@ZIF-8 show that the as-prepared catalysts have diffraction peaks similar to those of the corresponding ZIF materials, indicating that the structure is maintained after Pd loading. , The FESEM images (Figure c,d) show that Pd@ZIF-L holds the same morphology as that of Pd@ZIF-L-Co (Figure ), exhibiting a rodlike structure, while Pd@ZIF-8 retains its 3D rhombic dodecahedra structure, similar to that of Pd@ZIF-67 (Figure ). The catalytic performance of Pd@ZIF-L is much higher than that of Pd@ZIF-8 (Figure b), which confirms that layered catalysts present a better catalytic performance than 3D catalysts for p -nitrophenol hydrogenation.…”

Section: Resultsmentioning

confidence: 84%

“…This indicates that the crystallinity of the catalysts becomes stronger, which is mainly due to the increased amount of Pd@ZIF-67 phase. Because of the uniform dispersion of Pd NPs, no typical Pd peaks can be detected in any of the samples …”

Section: Resultsmentioning

confidence: 99%

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Pd Nanoparticles Immobilized in Layered ZIFs as Efficient Catalysts for Heterogeneous Catalysis

Liu

Jiang

Liu

et al. 2019

Ind. Eng. Chem. Res.

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Two-dimensional catalysts show outstanding catalytic performance due to their distinct laminar structure and electronic properties. A facile synthesis of layered catalysts with superior catalytic performance remains a significant challenge. Herein, a novel layered Pd@ZIF-L-Co catalyst is synthesized via a facile in situ method; additionally, a series of transitional catalysts and a three-dimensional Pd@ZIF-67 catalyst are obtained by simply adjusting the ratio of water to methanol in the solvent. Characterizations of the catalysts reveal that layered ZIF-L-Co is beneficial in the dispersion and exposure of Pd NPs, and strong interactions exist between the layered ZIF framework and the PVP-Pd. The as-fabricated Pd@ZIF-L-Co shows superior catalytic properties in the reduction of nitroarenes with NaBH4, with a TOF value that is three times higher than that of Pd@ZIF-67. This work presents the design and synthesis of layered ZIF-based catalysts.

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Controllable synthesis of Pd@ZIF-L catalysts by an assembly method

Abstract: Pd@ZIF-L catalysts with uniform morphology and better catalytic performance were fabricated by controlling the 2-MeIM/Zn2+ and PVP/Zn2+ molar ratios.

Cited by 12 publications

References 43 publications

Pd-ZIF-L-GO ternary nanolaminates for enhanced heterogeneous catalysis

Pd-ZIF-L-GO ternary nanolaminates for enhanced heterogeneous catalysis

Controllable Synthesis of Pd-ZIF-L-GO: The Role of Drying Temperature

Pd Nanoparticles Immobilized in Layered ZIFs as Efficient Catalysts for Heterogeneous Catalysis

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