scholarly journals Zirconium-Titanium Phosphate Acid Catalysts Synthesized by Sol Gel Techniques

1998 ◽  
pp. 643-649 ◽  
Author(s):  
Nancy B. Jackson ◽  
Steven G. Thoma ◽  
Steven Kohler ◽  
Tina M. Nenoff
Keyword(s):  
Sol Gel ◽  
Titanium Phosphate ◽  
Acid Catalysts ◽  
Zirconium Titanium Phosphate

Synthesis, Characterization and Thermodynamics of Exchange Using Zirconium Titanium Phosphate Cation Exchanger

2007 ◽  
Vol 72 (9) ◽  
pp. 1306-1318 ◽  
Author(s):  
Rakesh P. Thakkar ◽  
Uma V. Chudasama
Keyword(s):  
Ion Exchange ◽  
Sol Gel ◽  
Entropy Change ◽  
Exchange Capacity ◽  
Titanium Phosphate ◽  
X Ray Diffraction ◽  
Ion Exchange Capacity ◽  
Standard Gibbs Energy Change ◽  
Equilibrium Exchange ◽  
Zirconium Titanium Phosphate

A mixed material of the class of tetravalent bimetallic acid (TBMA) salt - zirconium titanium phosphate (ZTP) - has been synthesized by the sol-gel technique. ZTP has been characterized by elemental analysis, thermal analysis (TGA, DTA), FTIR, X-ray diffraction and SEM. Ion exchange capacity (IEC) of the material has been determined and the effect of calcination (373-773 K) on IEC studied and chemical stability of the material in various media (acids, bases and organic solvents) assessed. Further, the equilibrium exchange of H in ZTP for Mg2+, Ca2+, Sr2+ and Ba2+ ions has been studied at 303, 313, 323 and 333 K at constant ionic strength. On the basis of the exchange isotherms, various thermodynamic parameters such as equilibrium constant (K), standard gibbs energy change (∆Go), entropy change (∆So) and enthalpy change (∆Ho) have been calculated. The parameters were correlated with the ion exchange characteristics of the material.

Spectroscopic, structural and textural properties of CaO and CaO–SiO2 materials synthesized by sol–gel with different acid catalysts

2008 ◽  
Vol 354 (2-9) ◽  
pp. 729-732 ◽  
Author(s):  
J. García ◽  
T. López ◽  
M. Álvarez ◽  
D.H. Aguilar ◽  
P. Quintana
Keyword(s):  
Sol Gel ◽  
Textural Properties ◽  
Acid Catalysts
Sign in / Sign up

Export Citation Format

Share Document