5 Preparation of the Catalysts
197
Fig. 5.8 Device for
sonochemical preparation of
catalysts. a Reprinted from
Ref. [70]. Copyright 2010,
with permission from John
Wiley & Sons. b Reprinted
from Ref. [71]. Copyright
2007, with permission from
Elsevier
been widely reported as an effective and simple method for preparing nanomaterials
[70].
In the preparation of catalysts, ultrasonic oscillation is often used as an assistive
technique to promote dissolution and dispersion. Nagao et al. prepared PtRu alloy
catalyst by sonochemistry method, and their reaction system is shown in Fig. 5.8b.
Ultrasound was introduced to promote the dispersion of carbon powders and the
dissolution of precursors in aqueous solution, and then sodium borohydride was
added rapidly to reduce precursors with the assistance of ultrasound at 600 W. The