Synthesis Of Mesoporous Zirconia Research Articles

Synthesis of Mesoporous Zirconia and Mesoporous Zirconia doped with Yttria by Using Pluronic F-127.

Synthesis of Mesoporous Zirconia and Mesoporous Zirconia doped with Yttria by Using Pluronic F-127.

Facile synthesis of mesoporous zirconia nanocrystals in acid/base-free conditions

The synthesis of mesoporous zirconia was usually achieved in extreme (acid or alkaline) PH conditions, which could result in generating a great deal of wastes that were not good for the environment. The one-pot vapour-induced synthesis route alternative to conventional acidification or basification was applied to prepare the mesostructured zirconia nanocrystals using the CTAB and F127 surfactant as template, respectively, in the paper. The nanomaterials exhibit well crystallinity and narrow pore size distribution centred at ranging from 3.2 to 4.9 nm. Compared with CTAB, the F127-templated products show a smaller grain size of less than 6.1 nm, a higher specific surface area of 167 m2 g−1 and a larger pore volume of 0.25 cm3 g−1. The synthesised mesoporous materials probably have important prospects as catalyst carriers and adsorbents.

Surface‐Casting Synthesis of Mesoporous Zirconia with a CMK‐5‐Like Structure and High Surface Area

AbstractAbout 15 years ago, the Ryoo group described the synthesis of CMK‐5, a material consisting of a hexagonal arrangement of carbon nanotubes. Extension of the surface casting synthesis to oxide compositions, however, was not possible so far, in spite of many attempts. Here it is demonstrated, that crystalline mesoporous hollow zirconia materials with very high surface areas up to 400 m2 g−1, and in selected cases in the form of CMK‐5‐like, are indeed accessible via such a surface casting process. The key for the successful synthesis is an increased interaction between the silica hard template surface and the zirconia precursor species by using silanol group‐rich mesoporous silica as a hard template. The surface areas of the obtained zirconias exceed those of conventionally hard‐templated ones by a factor of two to three. The surface casting process seems to be applicable also to other oxide materials.

Synthesis of Mesoporous Zirconia by Using Alkoxide Precursor and Triethanolammine as Hydrolysis Stabilizer

Journal Article Synthesis of Mesoporous Zirconia by Using Alkoxide Precursor and Triethanolammine as Hydrolysis Stabilizer Get access S E Borjas-Garcia, S E Borjas-Garcia Instituto de Fisica y Matematicas, Universidad Michoacana de San Nicolas de Hidalgo, Morelia, Michoacan, Mexico Search for other works by this author on: Oxford Academic Google Scholar P Martinez-Torres, P Martinez-Torres Instituto de Fisica y Matematicas, Universidad Michoacana de San Nicolas de Hidalgo, Morelia, Michoacan, Mexico Search for other works by this author on: Oxford Academic Google Scholar N Gomez-Ortiz, N Gomez-Ortiz Centro de Investigaciones en Optica A.C., Leon, Guanajuato, Mexico Search for other works by this author on: Oxford Academic Google Scholar N Dasgupta-Schubert, N Dasgupta-Schubert Facultad de Ciencias Fisico-Matematicas, Universidad Michoacana de San Nicolas de Hidalgo, Morelia, Michoacan, Mexico Search for other works by this author on: Oxford Academic Google Scholar G Viramontes-Gamboa, G Viramontes-Gamboa Facultad de Ciencias Fisico-Matematicas, Universidad Michoacana de San Nicolas de Hidalgo, Morelia, Michoacan, Mexico Search for other works by this author on: Oxford Academic Google Scholar J L Bernal, J L Bernal Departamento de Ingenieria Mecanica, Instituto Tecnologico de Orizaba, Orizaba, Veracruz, Mexico Search for other works by this author on: Oxford Academic Google Scholar A Medina-Flores, A Medina-Flores Instituto de Investigation en Metalurgia y Materiales, Universidad Michoacana de San Nicolas de Hidalgo, Morelia, Michoacan, Mexico Search for other works by this author on: Oxford Academic Google Scholar J L Pichardo-Molina, J L Pichardo-Molina Centro de Investigaciones en Optica A.C., Leon, Guanajuato, Mexico Search for other works by this author on: Oxford Academic Google Scholar L Bejar-Gomez, L Bejar-Gomez Facultad de Ingenieria Mecanica, Universidad Michoacana de San Nicolas de Hidalgo, Morelia, Michoacan, Mexico Search for other works by this author on: Oxford Academic Google Scholar M E Garcia-Espinoza M E Garcia-Espinoza Instituto Tecnologico de Morelia, Morelia, Michoacan, Mexico Search for other works by this author on: Oxford Academic Google Scholar Microscopy and Microanalysis, Volume 23, Issue S1, 1 July 2017, Pages 1956–1957, https://doi.org/10.1017/S1431927617010443 Published: 04 August 2017

Synthesis of Mesoporous Zirconia by Using CTAB as Template

Synthesis of Mesoporous Zirconia by Using CTAB as Template

Effect of synthesis route of mesoporous zirconia based Ni catalysts on coke minimization in conversion of biogas to synthesis gas

Mesoporous zirconia and nickel incorporated zirconia catalysts were prepared following different routes. Synthesis of mesoporous zirconia and Ni incorporated zirconia with very narrow pore size distributions and high surface area was achieved. Ni incorporated mesoporous zirconia materials showed high activity in carbon dioxide reforming of methane, performed at 600 °C. Coke formation during dry reforming was eliminated over the Ni incorporated zirconia catalyst prepared by the one-pot procedure, using Pluronic P123 as the surfactant. It was shown that Ni was very well distributed within this material with cluster sizes smaller than the detection limit of XRD. This catalyst also showed highly stable catalytic performance. However, the catalysts prepared by the impregnation method showed higher activity but much higher coke formation than the catalyst prepared by the one-pot route.

Synthesis of Mesoporous Zirconia Templated by Block Copolymer-Lysozyme Conjugate in Aqueous Media

Synthesis of Mesoporous Zirconia Templated by Block Copolymer-Lysozyme Conjugate in Aqueous Media

Preparation of a novel mesoporous solid base Na–ZrO 2 with ultra high thermal stability

In the synthesis of mesoporous zirconia with a high thermal stability, NaOH solution post-treatment played dual roles: it remarkably improved the thermal stability of mesoporous zirconia, and led to the specific area of the as-made product reached nearly 200 m 2 g −1 upon calcination at 700 °C for 4 h. At the same time, a mesoporous strong solid base, Na–ZrO 2, was formed after the sodium ions incorporated into the zirconia network. As a result, such a material exhibited a high activity towards the synthesis of dimethyl carbonate (DMC) from methanol and propylene carbonate (PC).

Synthesis of Mesoporous Zirconia with Hydrothermal Homogeneous Precipitation Method

Synthesis of Mesoporous Zirconia with Hydrothermal Homogeneous Precipitation Method

Syntheses of mesoporous zirconia with anionic surfactants

Synthesis of mesoporous zirconia has been performed by slowly hydrolyzing zirconium propoxide in the presence of anionic surfactants: dodecyl phosphate or sulfate (P12 and Sf12) and hexadecyl sulfonate (So16). t-Plot surface areas >400 m2 g–1 and diffraction lines corresponding to spacings near 45 A were measured for solids outgassed at 140–150 °C. This treatment does not remove the surfactant. After calcination in air at 500 °C and combustion of the surfactant the spacing increases to ca. 70 A and the mesoporous volume is reduced by a factor of about 2, whereas the pore wall material crystallizes in the tetragonal phase. A schematic model in which the surfactant is a scaffold component is suggested in order to explain these results. It is very different from the templating mechanisms reported for zirconia by others. The high resolution electron microscopic study reveals the presence of a disorganized network of polygonal pores in the solids obtained through the mediation of surfactant. It is suggested that the chemistry of the hydrolysis solution is instrumental in the organization of the pore structure and in determining the thickness of the walls. In agreement with others, the fixation of PO4 or SO4 in the walls may help to preserve the porous structure.

Synthesis of Mesoporous Zirconia Using an Amphoteric Surfactant

An amphoteric surfactant, cocamidopropyl betaine, was used for the synthesis of mesoporous zirconia. The carboxylate functionality of the surfactant permitted strong bonding with soluble zirconium species, while the quaternary ammonium group ensured large headgroup area and high solubility under acidic conditions. An amphoteric co-template [betaine, or (carboxymethyl)trimethylammonium hydroxide] improved uniformity of the hexagonal mesophase. Transmission electron microscopy (TEM) of the as-synthesized zirconium sulfate mesophase indicated hexagonal mesostructure, and low-angle X-ray diffraction (XRD) showed a 41 {angstrom} primary d-spacing and two higher order reflections of a hexagonal lattice. High surface area zirconia was produced by controlled base treatment of the hexagonal mesophase with sodium hydroxide, followed by calcination. TEM and XRD indicated that the mesostructure was stable to 350 C.