Hydrothermal synthesis of high surface area ZIF-8 with minimal use of TEA

Butova, Vera V.; Budnyk, Andriy P.; Буланова, Елена А.; Lamberti, Carlo; Soldatov, A. V.

doi:10.1016/j.solidstatesciences.2017.05.002

Cited by 85 publications

(32 citation statements)

References 54 publications

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“…This is in line with the XRD analysis that the ZIF-8 material is less ordered than its hydrothermally synthesized ZIF-8-HT counterpart. The Brunauer-Emmett-Teller (BET) surface areas of ZIF-8 and ZIF-8-HT were calculated as 1351 m 2 •g −1 and 1967 m 2 •g −1 , respectively, which are in line with earlier reports [41,42]. In particular, the ZIF-8-HT material has a notably high surface area closer to the theoretical value [25].…”

Section: Characterisation Of Catalystssupporting

confidence: 86%

ZIF-8 Metal Organic Framework for the Conversion of Glucose to Fructose and 5-Hydroxymethyl Furfural

et al. 2019

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Herein, Zeolitic imidazolate framework-8 (ZIF-8) is considered as an easy and cheap to prepare alternative catalyst for the isomerization of glucose and production of 5-hydroxymethyl furfural (HMF). For the synthesis of the ZIF-8 catalysts two preparation methods were evaluated, being room temperature and hydrothermal synthesis at 140 °C. Of these, the hydrothermal synthesis method yields a material with exceptionally high surface area (1967 m2·g−1). As a catalyst, the ZIF-8 materials generated excellent fructose yields. Specifically, ZIF-8 prepared by hydrothermal synthesis yielded a fructose selectivity of 65% with a glucose conversion of 24% at 100 °C in aqueous reaction medium. However, this selectivity dropped dramatically when the reactions were repeated at higher temperatures (~140 °C). Interestingly, greater quantities of mannose were produced at higher temperatures too. The lack of strong Brønsted acidity in both ZIF-8 materials resulted in poor HMF yields. In order to improve HMF yields, reactions were performed at a lower pH of 1.0. At 140 °C the lower pH was found to drive the reaction towards HMF and double its yield. Despite the excellent performance of ZIF-8 catalysts in batch reactions, their activity did not translate well to the flow reactor over a continuous run of 8 h, which was operating with a residence time of 6 min. The activity of ZIF-8 halved in the flow reactor at 100 °C in ~3 h, which implies that the catalyst’s stability was not maintained in the long run.

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Section: Characterisation Of Catalystssupporting

confidence: 86%

ZIF-8 Metal Organic Framework for the Conversion of Glucose to Fructose and 5-Hydroxymethyl Furfural

et al. 2019

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“…8. 29,30 The peak at 426 cm À1 is related to Zn-N stretching vibration band, which shows the chemical composition of zinc with the nitrogen atom in the 2-methylimidazole ligand. In addition, bands are detected around 1600 cm À1 , 2350 cm À1 are respectively related to H-O-H bending of adsorbed water and stretching vibration of adsorbed CO 2 from surrounding.…”

Section: Resultsmentioning

confidence: 99%

Different view of solvent effect on the synthesis methods of zeolitic imidazolate framework-8 to tuning the crystal structure and properties

2021

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“…The nitrogen adsorption-desorption isotherms of the ZIF-8, AuAg/ZIF-8, Au@Ag/ZIF-8, and Ag@Au/ZIF-8 are displayed in Figure 2. All of the samples display type-І adsorption-desorption isotherms, which are characteristic of microporous materials [40]. The Brunner–Emmet–Teller (BET) surface areas of ZIF-8, AuAg/ZIF-8, Au@Ag/ZIF-8, and Ag@Au/ZIF-8 were 1763, 1530, 433, and 331 m 2 /g, respectively.…”

Section: Resultsmentioning

confidence: 99%

Bimetallic Gold-Silver Nanoparticles Supported on Zeolitic Imidazolate Framework-8 as Highly Active Heterogenous Catalysts for Selective Oxidation of Benzyl Alcohol into Benzaldehyde

et al. 2018

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The metal-organic zeolite imidazolate framework-8 (ZIF-8) supported gold-silver bimetallic catalysts with a core-shell structure (Au@Ag/ZIF-8 and Ag@Au/ZIF-8) and cluster structure (AuAg/ZIF-8) were successfully prepared by the deposition-redispersion method. Energy dispersive X-ray spectroscopy (EDS) elemental mapping images displayed that in the Au@Ag/ZIF-8 catalyst, Ag atoms were deposited on an exposed Au surface, and core-shell structured Au@Ag particles with highly dispersed Ag as the shell were formed. Additionally, the XPS investigation at gold 4f levels and silver 3d levels indicated that the Au and Ag particles of Au@Ag/ZIF-8, Ag@Au/ZIF-8, and AuAg/ZIF-8 were in a zero valence state. Among the resultant catalysts obtained in this study, Ag@Au/ZIF-8 catalysts showed the highest catalytic activity for the selective oxidation of benzyl alcohol, followed by AuAg/ZIF-8 and Au@Ag/ZIF-8. The turnover frequency (TOF) values were in the order of Ag@Au/ZIF-8 (28.2 h−1) > AuAg/ZIF-8 (25.0 h−1) > Au@Ag/ZIF-8 (20.0 h−1) at 130 °C within 1 h under 8 bar O2 when using THF as solvent. The catalysts of Au@Ag/ZIF-8 and Ag@Au/ZIF-8 with core–shell structures have higher benzaldehyde selectivities (53.0% and 53.3%) than the AuAg/ZIF-8 catalyst (35.2%) in the selective oxidation of benzyl alcohol into benzaldehyde. The effect of the solvent, reaction temperature, reaction time, and reaction pressure on benzyl alcohol conversion and benzaldehyde selectivity in benzyl alcohol selective oxidation over Au@Ag/ZIF-8, Ag@Au/ZIF-8, and AuAg/ZIF-8 were also investigated. All of the catalysts showed excellent performance at 130 °C under 8 bar O2 within 1 h when using THF as the solvent in the selective oxidation of benzyl alcohol to benzaldehyde. Moreover, the catalysts can be easily recycled and used repetitively at least four times.

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Hydrothermal synthesis of high surface area ZIF-8 with minimal use of TEA

Cited by 85 publications

References 54 publications

ZIF-8 Metal Organic Framework for the Conversion of Glucose to Fructose and 5-Hydroxymethyl Furfural

ZIF-8 Metal Organic Framework for the Conversion of Glucose to Fructose and 5-Hydroxymethyl Furfural

Different view of solvent effect on the synthesis methods of zeolitic imidazolate framework-8 to tuning the crystal structure and properties

Bimetallic Gold-Silver Nanoparticles Supported on Zeolitic Imidazolate Framework-8 as Highly Active Heterogenous Catalysts for Selective Oxidation of Benzyl Alcohol into Benzaldehyde

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