Mesoporous mixed metal oxides derived from P123-templated Mg–Al layered double hydroxides

Wang, Jun; Zhou, Jideng; Li, Zhanshuang; He, Yang; Sha, Lin; Liu, Qi; Zhang, Milin; Jiang, Zhaohua

doi:10.1016/j.jssc.2010.08.027

Cited by 23 publications

(19 citation statements)

References 40 publications

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“…In this sense, it would seem that the utmost classical approach (i.e. In this respect, the literature offers ample examples of the possibilities of sol-gel chemistry for the preparation of metal oxide-based solids (also called hybrid organic-inorganic materials), [155] which have an enhanced hydrothermal stability, as proven by studies which have applied an example these mesoporous metal oxides (TiO 2 ) in microreactor applications for moths. Taking zeolites and activated carbons as examples for crystalline and amorphous mi-croporous materials, their pore size is generally too small to fit even the smallest proteins.…”

Section: Future Prospectsmentioning

confidence: 99%

Coupling Chemical Modification and Immobilization to Improve the Catalytic Performance of Enzymes

Rodrigues¹,

2011

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Chemical modification and immobilization of enzymes have been usually considered unrelated tools to improve biocatalyst features. However, there are many examples where a chemically modified enzyme is finally used in an immobilized form, and that exemplifies how both tools may be complementary resulting in a synergism in the final results. In this review we present some of the strategies that may give that result. For example, the chemical modification of soluble enzymes may be used to improve their immobilization (reinforcing adsorption or improving multipoint covalent attachment), or just to improve enzyme stability and facilitate the selection of the immobilization conditions. Chemical modification of previously immobilized enzymes benefits from solid-phase chemistry due to the nature of enzymes (e.g., prevention of inactivation, aggregation, etc.). The use of different targets for chemical modifications with small molecules or multifunctional polymers are also discussed: intramolecular or intersubunit cross-linking, one-point modification, generation of artificial microenvironments, etc.

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Section: Future Prospectsmentioning

confidence: 99%

Coupling Chemical Modification and Immobilization to Improve the Catalytic Performance of Enzymes

Rodrigues¹,

2011

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“…However, such a top‐down process for the formation of interparticle pores is not suitable for control of the pore sizes and surface areas of MMOs. Templated synthesis of porous MMOs using polystyrene particles (350–600 nm) or block copolymer micelles (such as Pluronic F127 and Pluronic P123) as templates is more useful for controlling the properties of the porous structures. In these templated syntheses, porous MMOs are prepared by co‐precipitation of Mg‐Al LDH or Ni‐Al LDH in the presence of templates, and this is followed by calcination to remove the templates and to thermally decompose the LDHs.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Mesoporous Basic Oxides through Assembly of Monodispersed Mg–Al Layered Double Hydroxide Nanoparticles

Kuroda

Matsuno

Kamata

et al. 2017

Chemistry A European J

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Mesoporous basic Mg-Al mixed metal oxides (MMOs) with a high surface area and large pore size have been prepared through the assembly of monodispersed layered double hydroxide nanoparticles (LDHNPs) with block copolymer templates. The particle sizes of the LDHNPs were mainly controlled by varying the concentration of tris(hydroxymethyl)aminomethane (THAM), which was used as a surface stabilizing agent. LDHNPs and micelles of a block copolymer (Pluronic F127) were assembled to form a composite. The composites were calcined to transform them into mesoporous MMOs and to remove the templates. The Brunauer-Emmett-Teller surface areas, mesopore sizes, and pore volumes increased as a result of using the templates. Moreover, the pore sizes of the mesoporous MMOs could be controlled by using LDHNPs of different sizes. The mesoporous MMOs prepared from the LDHNPs showed much higher catalytic activity than a conventional MMO catalyst for the Knövenagel condensation of ethyl cyanoacetate with benzaldehyde. The mesoporous MMO catalyst prepared using the smallest LDHNPs, about 12 nm in size, showed the highest activity. Therefore, the use of monodispersed LDHNPs and templates is effective for preparing highly active mesoporous solid base catalysts.

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“…Three planes of diffraction peaks (2q = 37.01°, 43.00° and 62.44°) are assigned to MgO (asterisks), which showed well-defined peaks, indicating that the mixed oxide formed is cubic MgO doped with an amorphous species (Al 2 O 3 ; Wang et al 2010). The appearance of impurity (i.e.…”

Section: Characterization Studies: X-ray Diffraction Electron Microsmentioning

confidence: 99%

“…Treatment with the template increased both the surface area and the pore diameter of the original material (Table 1). According to Wang et al (2010), both the physical and chemical properties of LDHs influence their CO 2 capture capacity. Wang et al (2012b) recently published a systematic investigation on the synthesis of Mg-Al hydrotalcites at different pH values.…”

Section: Studies Of Adsorption Of Comentioning

confidence: 99%

CO₂ Adsorption on Modified Mg–Al-Layered Double Hydroxides

Dantas

Fernandes

Santos

et al. 2015

Adsorption Science & Technology

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Because of increases in the burning of fossil fuels, there is an increased emission of pollutant gases (e.g. CO 2 ) into the atmosphere. An alternative to minimize these emissions is to capture these gases using porous materials, such as layered double hydroxides (LDHs). In this study, LDHs were synthesized by co-precipitation of ion salts of Mg 2+ and Al 3+. After the synthesis, the materials were treated with a template to expand the layers. The samples were then characterized by X-ray diffraction, thermogravimetric analysis/derivative thermogravimetry, adsorption/desorption of nitrogen, scanning electron microscopy/energy-dispersive X-ray spectroscopy and transmission electron microscopy. A CO 2 adsorption study was then performed to determine the adsorption capacity of the material in accordance with the contact time between the gas and the adsorbent. The adsorption capacities of LDHs and LDHs-P123 for CO 2 were 0.72 and 1.36 mmol/g, respectively, showing satisfactory results post-treatment.

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Mesoporous mixed metal oxides derived from P123-templated Mg–Al layered double hydroxides

Cited by 23 publications

References 40 publications

Coupling Chemical Modification and Immobilization to Improve the Catalytic Performance of Enzymes

Coupling Chemical Modification and Immobilization to Improve the Catalytic Performance of Enzymes

Preparation of Mesoporous Basic Oxides through Assembly of Monodispersed Mg–Al Layered Double Hydroxide Nanoparticles

CO₂ Adsorption on Modified Mg–Al-Layered Double Hydroxides

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Mesoporous mixed metal oxides derived from P123-templated Mg–Al layered double hydroxides

Cited by 23 publications

References 40 publications

Coupling Chemical Modification and Immobilization to Improve the Catalytic Performance of Enzymes

Coupling Chemical Modification and Immobilization to Improve the Catalytic Performance of Enzymes

Preparation of Mesoporous Basic Oxides through Assembly of Monodispersed Mg–Al Layered Double Hydroxide Nanoparticles

CO2 Adsorption on Modified Mg–Al-Layered Double Hydroxides

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CO₂ Adsorption on Modified Mg–Al-Layered Double Hydroxides