Preparation and Characterization of Microporous Sol-Gel Derived Ceramic Membranes for GAS Separation Applications

1992 ◽  
Vol 271 ◽  
Author(s):  
R. S. A. De Lange ◽  
J. H. A. Hekkink ◽  
K. Keizer ◽  
A. J. Burggraaf
Keyword(s):  
Molecular Sieve ◽  
Gas Transport ◽  
Sol Gel ◽  
Ceramic Membranes ◽  
Mesoporous Alumina ◽  
Microporous Silica ◽  
Alumina Membranes ◽  
Separation Factors ◽  
Silica Sols

ABSTRACTMesoporous alumina membranes were modified with microporous silica. The polymeric silica sols consist of very weakly branched polymeric molecules with a fractal dimension of 1.3 and Guinier radius of ≈ 2.0 nm. The resulting top layer material is microporous with a porosity of 40% and a layer thickness of 60 nm. Gas transport is activated with an activation energy of 11 kJ/mol for hydrogen and molecular sieve like separation factors have been obtained. From the mechanism of gas transport the conclusion can be drawn that the pores are of molecular dimensions (0.7 – 1 nm diameter).

scholarly journals Analysis and theory of gas transport in microporous sol-gel derived ceramic membranes

1995 ◽  
Vol 104 (1-2) ◽  
pp. 81-100 ◽  
Author(s):  
R.S.A. de Lange ◽  
K. Keizer ◽  
A.J. Burggraaf
Keyword(s):  
Gas Transport ◽  
Sol Gel ◽  
Ceramic Membranes

scholarly journals Formation and characterization of supported microporous ceramic membranes prepared by sol-gel modification techniques

1995 ◽  
Vol 99 (1) ◽  
pp. 57-75 ◽  
Author(s):  
R.S.A. de Lange ◽  
J.H.A. Hekkink ◽  
K. Keizer ◽  
A.J. Burggraaf
Keyword(s):  
Sol Gel ◽  
Ceramic Membranes

scholarly journals Synthesis and characterization of Fe(III)-doped ceramic membranes of titanium dioxide and its application in photoelectrocatalysis of a textile dye

2017 ◽  
Vol 36 (1) ◽  
pp. 18
Author(s):  
Emanuel C. Rodrigues ◽  
Layciane A. Soares ◽  
Marco A. Modenes Jr. ◽  
Jeosadaque J. Sene ◽  
Gilbert Bannach ◽  
...  
Keyword(s):  
Thin Film ◽  
Sol Gel ◽  
Ceramic Membranes ◽  
Titanium Isopropoxide ◽  
Textile Dye ◽  
Doped Tio2 ◽  
Precursor Material ◽  
Thin Film Electrodes ◽  
Nanocrystalline Anatase Tio2

Pure and Fe(III)-doped TiO2 suspensions were prepared by the sol gel method with the use of titanium isopropoxide (Ti(OPri)4) as precursor material. The properties of doped materials were compared to TiO2 properties based on the characterization by thermal analysis (TG-DTA and DSC), X-ray powder diffractometry and spectroscopy measurements (FTIR). Both undoped and doped TiO2 suspensions were used to coat metallic substrate as a mean to make thin-film electrodes. Thermal treatment of the precursors at 400°C for 2 h in air resulted in the formation of nanocrystalline anatase TiO2. The thin-film electrodes were tested with respect to their photocatalytic performance for degradation of a textile dye in aqueous solution. The plain TiO2 remains as the best catalyst at the conditions used in this report.

Preparation and characterization of alumina membranes and alumina–titania composite membranes

1999 ◽  
Vol 14 (9) ◽  
pp. 3599-3603 ◽  
Author(s):  
Li Shi ◽  
Ning-Bew Wong
Keyword(s):  
Thermal Analysis ◽  
Particle Size ◽  
Differential Thermal Analysis ◽  
Sol Gel ◽  
Composite Membranes ◽  
Particle Sizes ◽  
Pore Sizes ◽  
Surface Areas ◽  
Alumina Membranes

Supported and unsupported γ-alumina membranes and alumina–titania composite membranes were prepared using the sol-gel method. In the course of preparation, effects of acid concentration, type of acid, alkoxide, and binder on the particle size of the sols and pore size of the membranes were investigated by thermogravimetry and differential thermal analysis, N2 physisorption, and light scattering. It was observed that the particle sizes of all the sols had only a small affect on the pore sizes of the membranes. Qualities of the membranes were improved by addition of polyvinyl alcohol as binder to the boehmite precursor. This resulted in less critical but more controllable drying and calcining procedures. Composite membranes with different pore sizes from 3.2 to 4.8 nm and surface areas retained above 100 m2/g could be regulated by different alumina-to-titania ratios.

SYNTHESIS AND CHARACTERIZATION OF MICROPOROUS SILICA-ALUMINA THIN FILMS

2010 ◽  
Vol 09 (06) ◽  
pp. 571-574
Author(s):  
CHERAITIA ABDALLAH ◽  
SATHA HAMID ◽  
AYRAL ANDRÉ
Keyword(s):  
Thin Films ◽  
Mixed Oxide ◽  
Sol Gel ◽  
Dip Coating ◽  
Microporous Silica ◽  
Molar Ratios ◽  
Spectroscopic Analyses ◽  
Silica Alumina ◽  
Acidic Alumina

Microporous silica-alumina thin films were prepared by a simple and robust sol-gel method. Tetraethoxysilane was mixed with an acidic alumina hydrosol. Urea was added for the preparation of the alumina hydrosol, for controlling the polycondensation of the mixed oxide network and also as porogen agent. Thin films were deposited by dip-coating on dense substrates. IR and 27 Al NMR spectroscopic analyses showed that for Si/Al molar ratios up to 6/1, a homogeneous mixed oxide is obtained with a random distribution of Al and Si atoms in the oxide lattice based on tetrahedral units. The deposited layers are crack-free as demonstrated by scanning electron microscopy (SEM) observations. Their microporosity was investigated using ellipsoporosimetry (EP) with films supported on flat substrates.

Synthesis and Characterization of Zinc Phosphates in Aqueous and Non-Aqueous Media with (2-Hydroxyethyl) Trimethyl Ammonium Hydroxide as Template

2010 ◽  
Vol 305-306 ◽  
pp. 89-94
Author(s):  
A. Samadi Maybodi ◽  
S.K. Hassani Nejad-Darzi
Keyword(s):  
Molecular Sieve ◽  
Zinc Phosphate ◽  
Sol Gel ◽  
Aqueous Media ◽  
Ammonium Hydroxide ◽  
The Other ◽  
Synthesis And Characterization ◽  
Zinc Phosphates ◽  
Different Types

Zinc phosphate molecular sieve were synthesized using zinc chloride, phosphoric acid as a zinc and phosphor source, respectively. Different types of zinc phosphates zeolites were synthesized by conventional hydrothermal (using (2-hydroxyethyl) trimethylammonium hydroxide (2-HETMAOH) as new template. Also, ethylene glycol (EG) was utilized as co-solvent and ultrasonic tool was applied as mixer. The influence of the chemical composition of the starting sol-gel and the other parameters such as, Zn/P mole ratio, time of microwave irradiation were studied.

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