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HANDBOOK OF HETEROGENEO
Edited by G. Ertl, H.
Part A, Chapter
SONOCATALY
Professor Kenneth S.
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8.6 Sonocatalysis
K. S. S U S L I C K
8.6.1 Introduction and theSonochemistry
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is significantly larger than th(~ at 20 kHz), spherical
no longer occurs, but instead asymmetric collapse which
genedirected at the surface, as seen dmicrocinematographic
sequences The tip jet velocities have beeborn to be greater
than
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cause smoothing of individual pation of particles into
extended
composition depth profiles of sonthat ultrasonic irradiation
effectioxide coatings. The removal of sings dramatically improves
reac
variety of reactions. With largerrials interparticle collisions
cau
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[17], probably through the removings which are often dominated
The ultrasonic activation of cmetal powders has also
received[18-20].
A Hydrogenation and Hydrosilati
The most heavily studied soh d l k l
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There have been several studultrasound on hydrosilation
reaBoudjouk who extended with nickel to the hydrosilatiWhereas are
many catalyssimple alkenes, relatively few wor
substrates, such as acrylonitsound to prepare hydrosilation
ca
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of Fig. 4alloys lack long-range crystalliunique electronic,
magnetic, andThe production of amorphous A4.4) is difficult e
K of molten metals icrystallization. As discussed e
can induce extraordinary
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increases specific areas and cabe obtained, selectivity toward
thdecreased.
An entirely separate use of ultpreparation involves the use of
ultrfollowed by secondary gas-phase
photocatalysts
wpreparation of Products
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with ultrasound, perhaps througor increased access ofalumina
surface.
+
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for fuel cells The geninvolves the reduction of
a carbon carrier, often colloidalultrasonic irradiation.The use
of ultrasound to impr
metal-containing gels has been re
issued for a sonochemical procecontaining
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industrial problem with any cawith supported metal catalysts.
T
cess will vary depending on the caof its use, and includes the
deposcontaminants, coking, the oxidatineutralization of surface
acid si
extensive patent literature over tb h f l d
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stirring yieldsultrasound they are 2.5, with clecular weights of
Inpreferential cleavage of losound
A European patent has recenapplication of ultrasound to
ppreparation By spraying
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9. C. M. I. L
10. K. Suslick, S. SciK. J. Doktyn in
(Ed.: T. 1. JAI Press:pp.
199.
12. K. Suslick, M. L. H. Green, M.
13. J. T. P.45.
14. A. N. Z. h
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4 1 .4 1 . T. 4 8 .4 8 . T. T. J.
49. T. T. 1T. J. T.
51. J. 52. W. D. 53 V I L
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High-velocity interparticle collisions cauation of slurries are
responsible for thepassivating oxide coating. Reproduced w
Figure 4. Scanning electron micrograpstructured iron powder
produced from of Fe(CO)5. Reproduced with permissio
