Phase Stabilization of Mesoporous Mn-Promoted ZrO2: Influence of the Precursor

Marcello L. Hernández-Pichardo; J.A. Montoya; P. Del Angel; S.P. Paredes

doi:10.4028/www.scientific.net/AMR.132.68

Paper Titles

Synthesis of Si-Based Mesoporous Materials with Different Structural Regularity
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Comparative Studies of the CoMo/MgO, CoMo/Al₂O₃ and CoMo/MgO-MgAl₂O₄ Catalysts Prepared by a Urea-Matrix Combustion Method
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ZnAlFe Mixed Oxides Obtained from LDH Type Materials as Basic Catalyst for the Gas Phase Acetone Condensation
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Structure Sensitivity of Sol-Gel Alkali Tantalates, ATaO₃ (A= Li, Na and K): Acetone Gas Phase Condensation
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Phase Stabilization of Mesoporous Mn-Promoted ZrO₂: Influence of the Precursor
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Promotional Effect of Gadolinia on CuO Catalyst for Reduction of NO by Activated Carbon
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Synthesis and Photocatalytic Performance of Hierarchical Porous Titanium Phosphonate Hybrid Materials
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Role of Nanocrystalline Titania Phases in the Photocatalytic Oxidation of NO at Room Temperature
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Chitin/TiO₂ Composite for Photocatalytic Degradation of Phenol
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Phase Stabilization of Mesoporous Mn-Promoted ZrO₂: Influence of the Precursor

Abstract:

Mesoporous zirconia-Mn oxides were prepared by surfactant-assisted precipitation using different zirconia precursors and cetyl-trimethyl-ammonium bromide (CTAB) as a synthetic template. The objective of this work was to find out the influence of the zirconia precursors over the structural and textural characteristics of Mn-doped mesoporous zirconia solids. A series of syntheses were carried out by two methods using different zirconia precursors, modifying the Zr:surfactant ratio and the hydrolysis rate of the precipitate. After calcination at 500 °C, the samples were characterized by XRD, DTA, TEM and nitrogen adsorption-desorption isotherm. The use of the zirconium nitrate leads to materials having higher surface areas and narrow pore size distributions in the range of mesoporous materials; however, the preferential formation of the zirconia in the metaestable tetragonal phase was identified as the effect of the particle size allowed by the preparation method rather than the effect of the precursor. It was also found that the Mn and surfactant addition enhances the stabilization of the tetragonal crystalline phase and porosity.