Comparison of Pd-UiO-66 and Pd-UiO-66-NH 2 catalysts performance for phenol hydrogenation in aqueous medium

Guan, Qingqing; Wang, Bin; Chai, Xiaoyan; Liu, Jing; Gu, Junjie; Ning, Ping

doi:10.1016/j.fuel.2017.05.029

Cited by 126 publications

(60 citation statements)

References 58 publications

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“…[92] Pd@UiO-66 resulted in complete conversion of phenol in increasing time as the reaction temperature decreases in the range from 120 to 60°C. [92] Pd@UiO-66 resulted in complete conversion of phenol in increasing time as the reaction temperature decreases in the range from 120 to 60°C.…”

Section: Pd Npsmentioning

confidence: 99%

Engineering UiO‐66 Metal Organic Framework for Heterogeneous Catalysis

et al. 2019

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frameworks (MOFs) are currently attracting considerable attention as heterogeneous catalysts at moderate temperatures, mainly for liquid-phase reactions. Since structural stability is one of the major concerns for the use of MOFs in catalysis, particularly considering that frequently some of the reported MOF materials are very unstable, the interest in this area has been focused on those MOFs exhibiting the highest structural robustness, UiO-66 being among the most widely used. Two introductory sections deal with the synthesis, structure and main properties of UiO-66, including its remarkable thermal (up to 350°C) and chemical (aqueous solution in a wide pH range) stability. The main body of the review summarizes those examples of using UiO-66 in catalysis grouped according to the nature of the active sites, starting with the use of UiO-66 as Lewis acids. In this section, emphasis has been made in the recent strategies to create structural defects in a controlled way that generate Lewis acidity. Other sections cover examples illustrating substituted terephthalate as active sites and the evidence that there is a synergy between acid and basic sites in close proximity that make some of these UiO-66 with substituents at the linker to act as dual acid-base catalysts. Other sections are focused on the use of UiO-66 as hosts of metal nanoparticles, metal oxides and other host, remarking the influence that the nature of UiO-66 and the possible presence of substituents in the framework play on the activity of the incorporated guest. The last section summarizes the current state of the art in the use of UiO-66 in catalysis and provides our views on future developments regarding the application of UiO-66 in industrial processes.

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Section: Pd Npsmentioning

confidence: 99%

Engineering UiO‐66 Metal Organic Framework for Heterogeneous Catalysis

et al. 2019

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“…After the introduction of Pd, both the BET surface area and the The BET surface area and pore structure of as-synthesized UiO-66-v and Pd/UiO-66-v were characterized by N 2 adsorption/desorption isotherms as shown in Figure 2. The BET surface was 862 m 2 •g −1 for UiO-66-v, which was closed to that for the UiO-66 modified with a single group (-NH 2 , -NO 2 and -OH) reported in the literature ( Table 1, Entry 1) [58][59][60]. The micropore area was calculated by the t-plot method and the area was 726 m 2 •g −1 , indicating the surface area was most contributed by the micropore area.…”

Section: Catalyst Characterizationmentioning

confidence: 49%

“…After the curve fitting process, two binding energy peaks cantered at 335.4 eV and 340.6 eV were observed corresponding to the 3d5/2 and 3d3/2 of Pd(0), respectively. [59][60][61] The low doublet separation for Pd (5.2 eV) should be caused by the interaction between Pd and Zr. Obviously, the PdCl2 was reduced to Pd(0) successfully by the vinyl.…”

Section: Catalyst Characterizationmentioning

confidence: 99%

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Facile Preparation of Pd/UiO-66-v for the Conversion of Furfuryl Alcohol to Tetrahydrofurfuryl Alcohol under Mild Conditions in Water

et al. 2019

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The hydrogenation of furan ring in the biomass-derived furans is of great importance for the conversion of biomass to valuable chemicals. Fabrication of high activity and selectivity catalyst for this hydrogenation under mild conditions was one of the focuses of this research. In this manuscript, UiO-66-v, in which vinyl bonded to the benzene ring, was first prepared. Then, the uniformly distributed vinyl was used as the reductant for the preparation of Pd/UiO-66-v. The catalyst was characterized by X-ray diffraction, thermogravimetric, N2 physical adsorption/desorption, X-ray photoelectron spectroscopy, scanning electron microscope, transmission electron microscopy, energy dispersive spectrometer elemental mappings, and inductively coupled plasma atomic emission spectroscopy to find the Pd/UiO-66-v had a narrow palladium nanoparticles size of 3–5 nm and maintained the structure and thermal stability of UiO-66-v. The Pd/UiO-66-v was used for the hydrogenation of furfuryl alcohol to tetrahydrofurfuryl alcohol in water. 99% conversion of furfuryl alcohol was obtained with 90% selectivity to tetrahydrofurfuryl alcohol after reacted at 0.5 MPa H2, 303 K for 12 h. The Pd/UiO-66-v was proved to be effective for the hydrogenation of furan ring in furans and could be used for at least five times.

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“…Phenol was purchased from Sigma-Aldrich. The experimental equipment used in this work was described in detail in our previous work [34].…”

Section: Methodsmentioning

confidence: 99%

Selective Conversion of Phenol in a Subcritical Water Medium Using γ-Al2O3 Supported Ni–Co Bimetallic Catalyst

Shi

Chen

et al. 2019

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The selective conversion of phenolic materials is a well-adopted solution to upgrade lignin-based bioresources into high-value bio-oil in biomass refinery industries. This study focused on four main aspects: characterization, selection of catalysts, reaction dynamics behaviors, and mathematical modelling. A model lignin, that is, phenol, was selectively transformed into cyclohexanol by using the prepared Ni–xCo/γ-Al2O3 catalysts in a subcritical water medium. The hydrogenation results showed that when using 15 wt% of Ni–3Co/γ-Al2O3 particles, both total mole yield and selectivity of cyclohexanol could reach approximately 80%, which further indicated that the particles are suitable for catalytic hydrogenation of phenol in subcritical water. Moreover, a reaction kinetics model was developed by chemical reaction kinetics and least squares regression analysis, the robustness and predictability of which were also verified.

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Comparison of Pd-UiO-66 and Pd-UiO-66-NH 2 catalysts performance for phenol hydrogenation in aqueous medium

Cited by 126 publications

References 58 publications

Engineering UiO‐66 Metal Organic Framework for Heterogeneous Catalysis

Engineering UiO‐66 Metal Organic Framework for Heterogeneous Catalysis

Facile Preparation of Pd/UiO-66-v for the Conversion of Furfuryl Alcohol to Tetrahydrofurfuryl Alcohol under Mild Conditions in Water

Selective Conversion of Phenol in a Subcritical Water Medium Using γ-Al2O3 Supported Ni–Co Bimetallic Catalyst

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