Search Results

You are looking at 21 - 30 of 381 items for :

  • Chemistry and Chemical Engineering x
  • Refine by Access: All Content x
Clear All

increases the density of charge carriers on the surface [ 10 ]. Such a support can be an n-type semiconductor like TiO 2 , a relatively cheap and highly stable material. Moreover, TiO 2 itself presents catalytic properties, being extensively used in

Restricted access

could improve the selectivity to crotyl alcohol. They also found that over a 0.5 % Ir/TiO 2 catalyst calcined at 400 °C and reduced 500 °C, a selectivity to crotyl alcohol of 35 % and a crotonaldehyde conversion of 3 % could be obtained. Abid et al

Restricted access

Abstract  

Metal ions sorption can be significantly affected by the presence of other sorbates, especially of complexing ligands. In this study, the effect of Se(IV) on Eu(III) sorption onto TiO2 at different pH and Eu(III) concentration was investigated. Se(IV) was found to enhance Eu(III) sorption as a function of Se(IV) concentration. Constant capacitance model was successfully used to interpret the sorption experimental data. The solubility product of Eu2(SeO3)3 at ambient temperature was investigated to highlight the sorption mechanism of ternary sorption system. The pK sp value of Eu2(SeO3)3 was found to be 31.51 ± 0.95.

Restricted access

Introduction A lot of efforts have been made by the researchers all over the world to improve the different properties of TiO 2 -based materials especially in crystalline TiO 2 nanoparticles (NPs). Remarkable progress has been

Restricted access

Introduction Photocatalytic degradation of azo dyes using TiO 2 as photocatalyst in aqueous solution under artificial UV light irradiation has been reviewed thoroughly many times (e.g. [ 1 – 10 ]). Publications dealing with

Restricted access

. Therefore, the application of heterogeneous acidic catalysts, such as cation-exchange resins [ 20 , 21 ], heteropolyacids (HPAs) [ 14 ], zeolites [ 22 ] and solid superacids [ 23 ] has attracted more and more interest. As reported, TiO 2 –SiO 2 can provide

Restricted access

Introduction TiO 2 photocatalysis has been widely implemented in the environmental cleanup during recent 10 years. Self-cleaning materials for construction as various types of glass, tiles, tent materials, road concrete, floor

Restricted access

-decaying methods are both highly environmentally friendly and economical since the energy for such procedures can be derived from solar radiation and air oxygen can be used as the oxidant [ 1 – 5 ]. Transition metal oxides or sulfides (particularly TiO 2 , which

Restricted access

model was very close to the value determined experimentally. We have now extended that work and report here an SET analysis of the catalytic hydrogenation of a range of substituted nitroarenes over Au/TiO 2 . Aromatic amines are extensively used

Restricted access

O 5 –WO 3 /TiO 2 [ 3 ], Mn/TiO 2 [ 4 , 5 ], Fe/TiO 2 [ 6 ], Cu/TiO 2 [ 7 ], Cr/TiO 2 [ 8 ], and MnO X –CeO 2 [ 9 ]. Only a few of them are applied in practice, the most prominent being V 2 O 5 /TiO 2 promoted by WO 3 and/or MoO 3

Restricted access