Titania conventional

These processes are very rapid and allow the preparation of inorganic supports in one step. This technique allows large-scale manufacturing of supports such as titania, fumed silica, and aluminas. Sometimes the properties of the material differ from the conventional preparation routes and make this approach unique. Multicomponent systems can be also prepared, either by multimetallic solutions or by using a two-nozzle system fed with monometallic solutions [22]. The as-prepared powder can be directly deposited onto substrates, and the process is termed combustion chemical vapor deposition [23]. 

In this work, flame spray pyrolysis was applied to the synthesis of titania particles to control the crystal structure and crystallite size and compared with the particle prepared by the conventional spray pyrolysis... 

Fig. 1. XRD patterns of titania particles by conventional spray pyrolysis wife various preparation tempaatures.

Another distinguishing feature of titania prepared by flame spray pyrolysis is the draar e of anatase crystallite size with the increase of flame temperature. Generally, the increase of preparation temperature increases the crystallite size in other processes such as sol-gel method, hydrothermal method [2, 3], flame processing and conventional spray pyrolysis. The decrease of crystallite size was directly related to the decrease of particle size. Fig. 5 shows SEM and TEM images of titania particles prepared by flame spray pyrolysis. 

Compared with the conventional spray pyrolysis, flame spray pyrolysis produces titania particles that are strikingly different in crystd phase and surfece arra. The fraction of anatase phase increases with the increase of flame tempCTature while it decreases with the increase of preparation temperature in the conventional spray pyrolysis. The sur e area and... 

Alternative to the conventional vanadia/titania-based catalysts for the selective reduction of NO by ammonia... 

Fig. 10. Representative topography of nanophase and conventional titania. Representative atomic force micrographs of (a) nanophase titania with 39-nm grain sizes and of (b) conventional titania with 4520-nm grain sizes, illustrating the different topographies of nanophase compared to conventional grain size ceramics.

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