Au@UiO-66: a base free oxidation catalyst

Leus, Karen; Concepción, Patricia; Vandichel, Matthias; Meledina, Maria; Grirrane, Abdessamad; Esquivel, Dolores; Turner, Stuart; Poelman, Dirk; Waroquier, Michel; Speybroeck, Véronique Van; Tendeloo, Gustaaf Van; Garcı́a, Hermenegildo; Voort, Pascal Van Der

doi:10.1039/c4ra16800c

Cited by 60 publications

(47 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To date, VPS of zeolitic materials have been calculated successfully to elucidate the framework vibrations [40], but this is not yet a routine strategy for MOFs. Leus et al [41] reported VPS of Au nanoparticles loaded in UiO-66, which were found to be in good agreement with experimental spectra. Furthermore, Greathouse and Allendorf [42] obtained VPS from force field data in order to discuss the slow torsional motion (40 cm −1 ) of the aromatic rings in IRMOF-1 which they validated via NMR measurements.…”

Section: Introductionsupporting

confidence: 69%

Vibrational fingerprint of the absorption properties of UiO-type MOF materials

et al. 2016

View full text Add to dashboard Cite

show abstract

Section: Introductionsupporting

confidence: 69%

Vibrational fingerprint of the absorption properties of UiO-type MOF materials

et al. 2016

View full text Add to dashboard Cite

show abstract

“…[108] The average Au NP size in Au@UiO-66 was 7 nm that is somewhat larger than the dimensions of the UiO-66 cavities (< 2 nm), indicating that either these Au NPs are located in defects, or cause a distortion of the lattice or, more probably, are located on the external surface of the crystallites. [108] The average Au NP size in Au@UiO-66 was 7 nm that is somewhat larger than the dimensions of the UiO-66 cavities (< 2 nm), indicating that either these Au NPs are located in defects, or cause a distortion of the lattice or, more probably, are located on the external surface of the crystallites.…”

Section: Other Metal Npsmentioning

confidence: 94%

“…Au NPs were homogeneously synthesized in-situ on UiO-66 host matrix to afford Au@UiO-66 and its catalytic activity was examined in the aerobic oxidation of benzyl alcohol. [108] The average Au NP size in Au@UiO-66 was 7 nm that is somewhat larger than the dimensions of the UiO-66 cavities (< 2 nm), indicating that either these Au NPs are located in defects, or cause a distortion of the lattice or, more probably, are located on the external surface of the crystallites. Au@UiO-66 exhibited 94 % conversion of benzyl alcohol with 100 % selectivity to benzaldehyde when the reaction is carried out in toluene at 100°C in the absence of base.…”

Section: Other Metal Npsmentioning

confidence: 94%

Engineering UiO‐66 Metal Organic Framework for Heterogeneous Catalysis

et al. 2019

View full text Add to dashboard Cite

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.

show abstract

“…The Au high-resolution scan in Figure 6A has peaks at 83.9 and 87.6 eV, corresponding to the 4f 7/2 and 4f 5/2 of Au 0 [67]. The curve fitting revealed that the higher binding energy contributions shifted in binding energy by~1.5 eV, indicative of the presence of some Au +1 species [68]. For Ag (Figure 6B), the high-resolution spectra indicate the presence of Ag 0 peaks at 368.1 and 374.1 eV for 3d 5/2 and 3d 3/2 .…”

Section: Synthesis and Characterisation Of 1d Auag Nanostructuresmentioning

confidence: 98%

One Dimensional AuAg Nanostructures as Anodic Catalysts in the Ethylene Glycol Oxidation

et al. 2020

View full text Add to dashboard Cite

Direct alcohol fuel cells are highly promising as efficient power sources for various mobile and portable applications. However, for the further advancement of fuel cell technology it is necessary to develop new, cost-effective Pt-free electrocatalysts that could provide efficient alcohol oxidation and also resist cross-over poisoning. Here, we report new electrocatalytic materials for ethylene glycol oxidation, which are based on AuAg linear nanostructures. We demonstrate a low temperature tunable synthesis that enables the preparation of one dimensional (1D) AuAg nanostructures ranging from nanowires to a new nano-necklace-like structure. Using a two-step method, we showed that, by aging the initial reaction mixture at various temperatures, we produced ultrathin AuAg nanowires with a diameter of 9.2 ± 2 and 3.8 ± 1.6 nm, respectively. These nanowires exhibited a high catalytic performance for the electro-oxidation of ethylene glycol with remarkable poisoning resistance. These results highlight the benefit of 1D metal alloy-based nanocatalysts for fuel cell applications and are expected to make an important contribution to the further development of fuel cell technology.

show abstract

Au@UiO-66: a base free oxidation catalyst

Abstract: We present the in situ synthesis of Au nanoparticles within the Zr based Metal Organic Framework, UiO-66.

Cited by 60 publications

References 48 publications

Vibrational fingerprint of the absorption properties of UiO-type MOF materials

Vibrational fingerprint of the absorption properties of UiO-type MOF materials

Engineering UiO‐66 Metal Organic Framework for Heterogeneous Catalysis

One Dimensional AuAg Nanostructures as Anodic Catalysts in the Ethylene Glycol Oxidation

Contact Info

Product

Resources

About