Journal ArticleDOI
Preparation and Characterization of Porous SiO2-Al2O3-ZrO2 Prepared by the Sol-Gel Process
R. Mendoza-Serna,J. Méndez-Vivar,E. Loyo-Arnaud,J. A. Moreno-Rodriguez,Pedro Bosch,Victor Lara +5 more
TLDR
In this article, an experimental strategy was developed to obtain Si-Al-Zr transparent sols via the sol-gel process, which was prepared from Al(OBus)3 (OBus: C2H5CH(CH3)O), Zr(OPrn)4 (OPrn: OCH2CH2Ch3) and Si(OEt)4.Abstract:
An experimental strategy was developed to obtain Si—Al—Zr transparent sols via the sol-gel process. The sol was prepared from Al(OBus)3 (OBus: C2H5CH(CH3)O), Zr(OPrn)4 (OPrn: OCH2CH2CH3) and Si(OEt)4. The chelating agents acetylacetone (2, 4 pentanedione, acacH), and itaconic anhydride (2-methylenesuccinic anhydride, anhH) were employed separately to stabilize Al and Zr precursors in order to control their chemical reactivity, avoiding precipitation. In all cases a prehydrolyzed tetraethyl orthosilicate (TEOS) sol was the Si source. We use the Partial Charge Model as a theoretical indication of the stabilization of the Al and Zr species derived from the reaction with anhH and acacH. The sols were polymerized at room temperature (293 K) to obtain gels and these were dried and calcined at 673, 773 and 873 K in air. The characterization techniques were Small Angle X-ray Scattering (SAXS), Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD), Thermal Gravimetric (TGA) and Differential Thermal Analyses (DTA). The porosity and surface area of solids calcined at 673, 773 and 873 K were determined by N2 adsorption/desorption isotherms. The corresponding average pore diameter was evaluated using the methods BJH, HK and DA. These models were used because all together cover the full range of the pore size.read more
Citations
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Journal ArticleDOI
Hydrodesulphurization performance of NiW/TiO2-Al2O3 catalyst for ultra clean diesel
Aijun Duan,Ruili Li,Guiyuan Jiang,Jinsen Gao,Zhen Zhao,Guofu Wan,Dengqian Zhang,Weiqiang Huang,Keng H. Chung +8 more
TL;DR: In this article, the typical physico-chemical properties of NiW/TiO 2 -Al 2 O 3 catalysts with different TiO 2 loadings and their supports were characterized by means of BET, XRD and UV-vis DRS, etc.
Journal Article
Better ceramics through chemistry
TL;DR: In this paper, the authors apply polymeric network theory to the design of gel ultrastructures and apply scaling calculations based on molecular orbital calculations for prediction of the silanol polymerization mechanism.
References
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Book
Infrared and Raman Spectra of Inorganic and Coordination Compounds
TL;DR: In this article, the normal modes of vibration are illustrated and corresponding vibrational frequencies are listed for each type, including diatomic, triatomic, fouratomic, five-atomic, six-atomic and seven-atomic types.
Journal ArticleDOI
The Determination of Pore Volume and Area Distributions in Porous Substances. I. Computations from Nitrogen Isotherms
Book
Sol-Gel Science: The Physics and Chemistry of Sol-Gel Processing
TL;DR: Gel-Derived and Conventional Ceramics: as discussed by the authors Theoretical analysis of deformation and flow in gels and a comparison of gel-derived and conventional ceramics.
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