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Journal ArticleDOI

Nanosized iron and chromium oxides supported on mesoporous CeO2 and SBA-15 silica: Physicochemical and catalytic study

01 Nov 2010-Applied Surface Science (North-Holland)-Vol. 257, Iss: 2, pp 523-530
TL;DR: In this paper, mesoporous ceria and SBA-15 silica were modified with iron and chromium oxide nanoparticles and characterized by XRD, N2-physisorption, FTIR, UV-vis, Moessbauer spectroscopy and TPR-TG in hydrogen.
About: This article is published in Applied Surface Science.The article was published on 2010-11-01. It has received 30 citations till now. The article focuses on the topics: Iron oxide & Mesoporous material.
Citations
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Journal ArticleDOI
TL;DR: Mesoporous CeO2 catalysts were synthesized by pyrolysis of Ce-MOF precursor (Ce-(1,3,5-benzenetricarboxylic acid) (H2O)6) and their catalytic performance were evaluated by toluene combustion as mentioned in this paper.

314 citations

Journal ArticleDOI
TL;DR: In this paper, an iron based metal organic framework loaded on iron oxide nanoparticles (Fe3O4@MIL-100(Fe)) and its capability for the removal of methyl red was investigated.

113 citations

Journal ArticleDOI
TL;DR: In this article, the authors discuss the current advancements and latest breakthroughs in the fabrication of mesoporous silica nanoparticles, emphasizing the pros and cons, the confinement of various metal species in the nanospaces of MSNs, and various factors influencing the encapsulation of metal species.
Abstract: Despite their advantageous morphological attributes and attractive physicochemical properties, mesoporous silica nanoparticles (MSNs) are merely supported as carriers or vectors for a reason. Incorporating various metal species in the confined nanospaces of MSNs (M-MSNs) significantly enriches their mesoporous architecture and diverse functionalities, bringing exciting potentials to this burgeoning field of research. These incorporated guest species offer enormous benefits to the MSN hosts concerning the reduction of their eventual size and the enhancement of their performance and stability, among other benefits. Substantially, the guest species act through contributing to reduced aggregation, augmented durability, ease of long-term storage, and reduced toxicity, attributes that are of particular interest in diverse fields of biomedicine. In this review, the first aim is to discuss the current advancements and latest breakthroughs in the fabrication of M-MSNs, emphasizing the pros and cons, the confinement of various metal species in the nanospaces of MSNs, and various factors influencing the encapsulation of metal species in MSNs. Further, an emphasis on potential applications of M-MSNs in various fields, including in adsorption, catalysis, photoluminescence, and biomedicine, among others, along with a set of examples is provided. Finally, the advances in M-MSNs with perspectives are summarized.

92 citations

Journal ArticleDOI
TL;DR: In this article, a kind of magnetic metal-organic framework (MOF) was reported for the adsorption of different kinds of anionic and cationic dyes.
Abstract: As organic dyes are a major group of water pollutants, the development of materials for removal of dyes is of great significance for the environment. Here we report a kind of magnetic metal–organic framework (MOF) for the adsorption of different kinds of anionic and cationic dyes. Magnetic NH2-MIL-101(Al) was synthesized and characterized with Fourier-transform infrared spectrometry (FT-IR), physical property measurement system (PPMS), X-ray diffraction (XRD), a transmission electron microscope (TEM), a thermogravimetric analyzer (TGA) and nitrogen adsorption/desorption measurements. Adsorption isotherms and thermodynamic studies indicated that the maximum adsorption capacities of malachite green (MG) and indigo carmine (IC) were 274.4 and 135 mg g−1, respectively. The mechanisms of interaction such as electrostatic interaction, hydrogen bonding, π–π stacking interaction, and hydrophobic interaction are discussed for the adsorption of cationic and anionic dyes onto magnetic NH2-MIL-101(Al). Also, magnetic separation in this method shortened separation time, and the magnetic material can be reused at least five times without obvious decrease in the removal efficiency. Moreover, the synthesis of the magnetic NH2-MIL-101(Al) is easy to control and the good solvent stability makes this material promising as a novel adsorbent for the adsorption and removal of dyes from aqueous solution.

67 citations

Journal ArticleDOI
TL;DR: In this paper, the binding energy of Cr2O3 nanocubes with porous structure was synthesized by solvothermal method at 150°C/24h using potassium dichromate (K2Cr2O7), N, N-dimethyl formamide (DMF) and water.

61 citations

References
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Journal ArticleDOI
TL;DR: In this paper, a family of highly ordered mesoporous (20−300 A) structures have been synthesized by the use of commercially available nonionic alkyl poly(ethylene oxide) (PEO) oligomeric surfactants and poly(alkylene oxide) block copolymers in acid media.
Abstract: A family of highly ordered mesoporous (20−300 A) silica structures have been synthesized by the use of commercially available nonionic alkyl poly(ethylene oxide) (PEO) oligomeric surfactants and poly(alkylene oxide) block copolymers in acid media. Periodic arrangements of mescoscopically ordered pores with cubic Im3m, cubic Pm3m (or others), 3-d hexagonal (P63/mmc), 2-d hexagonal (p6mm), and lamellar (Lα) symmetries have been prepared. Under acidic conditions at room temperature, the nonionic oligomeric surfactants frequently form cubic or 3-d hexagonal mesoporous silica structures, while the nonionic triblock copolymers tend to form hexagonal (p6mm) mesoporous silica structures. A cubic mesoporous silica structure (SBA-11) with Pm3m diffraction symmetry has been synthesized in the presence of C16H33(OCH2CH2)10OH (C16EO10) surfactant species, while a 3-d hexagonal (P63/mmc) mesoporous silica structure (SBA-12) results when C18EO10 is used. Surfactants with short EO segments tend to form lamellar mesost...

6,274 citations

Journal ArticleDOI
TL;DR: A review of the state-of-the-art in the synthesis, characterization and application of ordered mesoporous oxides can be found in this paper, with a focus on the applications in catalysis or other areas.

988 citations

Journal ArticleDOI
TL;DR: In this article, the influence of the support on the electronic state, morphology, and catalytic properties of supported metal particles is discussed in terms of electronic modification of supported clusters and their morphological transformations induced by the support.
Abstract: Modern trends in studying the influence of the support on the electronic state, morphology, and catalytic properties of supported metal particles are reviewed. The analysis of new developments in techniques for catalyst characterization is given. Metal–support interaction effects are discussed in terms of electronic modification of the supported clusters and their morphological transformations induced by the support. Special attention is paid to the recent concepts of the structure of the metal–support interface. The support effects on the catalytic properties of metal particles are revealed as (1) changes due to metal particle charging, (2) effects related to variations in metal particle shape and crystallographic structure and, (3) appearance of the specific active sites at the metal–support boundary.

378 citations

Journal ArticleDOI
TL;DR: Convenient and commercially viable synthesis conditions are described, providing efficient and reproducible control of pore connectivity and pore wall thickness for the synthesis of high quality SBA-15 mesoporous silica.

297 citations

Journal ArticleDOI
TL;DR: In this paper, the authors investigated the performance of catalysts for preferential oxidation of CO in hydrogen-rich steam reformates using a high surface area (SBET=117-172 m2/g).

255 citations