Cerium-catalyzed oxidative C–C bond forming reactions

Christoffers, Jens; Werner, Thomas; Rössle, Michael

doi:10.1016/j.cattod.2006.11.008

Cited by 26 publications

(8 citation statements)

References 47 publications

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“…The DLS size distribution was plotted using a log-normal analysis method. 1 H nuclear magnetic resonance (NMR) was carried out on a 400 MHz Bruker AVANCE II. Proton chemical shis (d) are reported as shis from the internal standard tetramethylsilane (TMS).…”

Section: Characterisation Of Materialsmentioning

confidence: 99%

Design of mesoporous silica hybrid materials as sorbents for the selective recovery of rare earth metals

et al. 2015

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The importance of rare earth metals in the global economy has increased significantly in recent years due to their essential role in advanced technologies in the electronics and biomedical industries. The recovery and purification of rare earths metals from waste products is therefore appealing, both in terms of the sustainability of rare earth resources and ecological environmental protection. We herein present the preparation of novel mesoporous silica materials modified by maleic anhydride, which can be used in the recovery of rare earth metals through extraction of their ions from an aqueous solution. Our novel maleic anhydride functional hybrid materials demonstrate enhanced selectivity for heavy rare earth metals, which vastly improves the separation process and reduces recovery costs. In addition, the directly modified hybrid materials have been found to exhibit higher distribution coefficients for rare earth elements compared to other materials. Adsorption kinetics studies were also carried out, and the adsorption followed a pseudo-second order model, with particularly rapid adsorption observed in the case of Gd 3+ . The resulting adsorption isotherms of the materials were better represented by the Langmuir model than the Freundlich model. The singly modified material exhibited a Gd 3+ capture capacity of 76.89 mg g -1 . In addition, the proposed materials demonstrate a high degree of reusability over a number of cycles, thus enhancing their potential for application in rare earth metal recycling.

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Section: Characterisation Of Materialsmentioning

confidence: 99%

Design of mesoporous silica hybrid materials as sorbents for the selective recovery of rare earth metals

et al. 2015

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“…[2] Multimetal clusters of cerium ions have interesting electron transfer properties. [3][4][5] Cerium complexes are used as catalyst, [6][7][8][9] corrosion inhibitors, [10] luminescent materials, [11] probes for calciumbinding, [12] and as precursors for cerium oxide. [13] Dianion of dipicolinic acid (H 2 dpc) forms tris-chelate with cerium (III or IV) [14,15] and polymeric complex with cerium (III).…”

Section: Introductionmentioning

confidence: 99%

Tris-dipicolinate Cerium Complexes Bearing Dications of Arginine, Histidine, and Ornithine

Das

Ghosh

Baruah

2013

Synthesis and Reactivity in Inorganic, Metal-Organic, and Nano-

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dpc = dipicolinate, Py = pyridine) are synthesized and characterized. The cerium (IV) complexes (1, 2, 3) have one dication of the amino acids, whereas the cerium (III) complexes (4, 5) have one dication of amino acid together with one pyridinium cation. The role of the charge on the metal ion in the packing patterns is discussed and compared with bis-dipicolinate complexes of first row transition metal.

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“…Rare‐earth metals have become increasingly important over the last several decades. This is due to their use in both the electronics and the biomedical industries,1–4 as well as the use of their compounds in catalysis,5,6 nanotechnology,7,8 the production of luminescence compounds,9,10 and various chemical engineering applications 2,11. Rare‐earth elements (REE) can therefore be found in a variety of products from audio‐visual devices such as mobile phones, televisions and computer displays, to energy storage devices such as long‐life batteries 12,13.…”

Section: Introductionmentioning

confidence: 99%

Sodium “Activation” of Silano‐Phosphonate Modified Mesoporous TiO₂ Leading to Improved Rare‐Earth Element Extraction

Moloney

Causse

Loubat³

et al. 2014

Eur J Inorg Chem

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Due to their presence in most modern electronic devices and as waste products in the nuclear cycle, a great deal of interest has been generated in the acquisition and/or recycling/removal of rare-earth elements (REE). Here, we present a simple one-pot route for the preparation of dimethylphosphatoethyltriethoxysilane (SiP) functionalised mesoporous TiO 2 particles. The resistance of TiO 2 to strong bases allowed for the use of NaOH to "activate" the phosphonate head group of [a] 2268 the functionality, significantly improving its efficiency. Levels of 92.6 mg/g Ce 3+ were extracted from water, which is double the previously reported value for the extraction of REEs with this type of extractant. SiP-TiO 2 (Na) was also used to separate completely the Ce 3+ from aqueous solutions containing Sr 2+ and Cs + . Finally, the nanocomposite separated Ce 3+ from other homovalent REEs, for example, Yb 3+ (1:1.4 separation ratio).

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Cerium-catalyzed oxidative C–C bond forming reactions

Cited by 26 publications

References 47 publications

Design of mesoporous silica hybrid materials as sorbents for the selective recovery of rare earth metals

Design of mesoporous silica hybrid materials as sorbents for the selective recovery of rare earth metals

Tris-dipicolinate Cerium Complexes Bearing Dications of Arginine, Histidine, and Ornithine

Sodium “Activation” of Silano‐Phosphonate Modified Mesoporous TiO₂ Leading to Improved Rare‐Earth Element Extraction

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Cerium-catalyzed oxidative C–C bond forming reactions

Cited by 26 publications

References 47 publications

Design of mesoporous silica hybrid materials as sorbents for the selective recovery of rare earth metals

Design of mesoporous silica hybrid materials as sorbents for the selective recovery of rare earth metals

Tris-dipicolinate Cerium Complexes Bearing Dications of Arginine, Histidine, and Ornithine

Sodium “Activation” of Silano‐Phosphonate Modified Mesoporous TiO2 Leading to Improved Rare‐Earth Element Extraction

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Sodium “Activation” of Silano‐Phosphonate Modified Mesoporous TiO₂ Leading to Improved Rare‐Earth Element Extraction