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palladium systems supported on Al 2 O 3 [ 1 , 2 ], C [ 3 – 5 ], SnO 2 [ 6 – 8 ], CeO 2 [ 9 ], TiO 2 [ 10 , 11 ], and pumice [ 12 ]. Monometallic palladium catalysts are not very active in the reaction of nitrate reduction. However, they show high
) in excess oxygen has been proven to be an effective technology for the removal of nitrogen oxide emissions from power plants and heavy-duty diesel engines [ 1 , 2 ]. For the NH 3 -SCR reaction, the V 2 O 5 /TiO 2 catalyst promoted by WO 3 or MoO 3
diffraction peak of amorphous silica centered at about 2 θ = 23°, the same as the XRD pattern of the SBA-15 sample. The comparison with the XRD pattern of TiO 2 evidences clearly that no diffraction lines for crystalline TiO 2 anatase could be detected. It
Introduction The photocatalyst, for example, titanium dioxide (TiO 2 ) absorbs light with suitable wavelength in photocatalysis. An electron from the valence band is transferred to the conduction band and creates negative
conditions—contact time, kind of light, intensity of illumination, relative humidity of the feed and the oxygen/pollutant feed ratio. These investigations are usually carried out using a standard reference photocatalyst, most often it is TiO 2 Degussa P25
Titanium(IV)–EDTA complex
Kinetics of thermal decomposition by non-isothermal procedures
Abstract
This work aims the evaluation of the kinetic triplets corresponding to the two successive steps of thermal decomposition of Ti(IV)–ethylenediaminetetraacetate complex. Applying the isoconversional Wall–Flynn–Ozawa method on the DSC curves, average activation energy: E=172.49.7 and 205.312.8 kJ mol–1, and pre-exponential factor: logA=16.380.84 and 18.961.21 min–1 at 95% confidence interval could be obtained, regarding the partial formation of anhydride and subsequent thermal decomposition of uncoordinated carboxylate groups, respectively. From E and logA values, Dollimore and Mlek methods could be applied suggesting PT (Prout–Tompkins) and R3 (contracting volume) as the kinetic model to the partial formation of anhydride and thermal decomposition of the carboxylate groups, respectively.
that the structure of the tubular materials do not agree with those made of TiO 2 crystals with either anatase or rutile phase, but are similar to that of layered titanate H 2 Ti 3 O 7 according to detailed electron and X-ray diffraction studies
Introduction The use of nanocatalysts (especially titanium dioxide or titania or TiO 2 ) has gained wide recognition since they have the potential to tackle the ‘difficult-to-remove’ contaminants and thus are expected to play
research has been undertaken to study the effects of milling time on the mechanisms and efficiencies of reactions in the Al–TiO 2 –H 3 BO 3 system, using DSC, XRD, and SEM analyses. Experimental procedures Boric acid (mean
