I am following the catalyst preparation procedure expressed in the attached paper [Applied Catalysis B: Environmental 239 (2018) 280-289]. The procedure requires sonicating
for catalyst preparation better is to use sonicator prob not sonicator bath, generally, frequency is fixed in each sonicator that is 20kHz whereas, the rest conditions are set by user like amplitude, power, process time, pulse on and off I would suggest to use Qsonica 700 for catalyst preparation.
I agree with Mariam Ameen that a sonication probe can be very efficient and that the efficiency of ultrasounds is very inhomogeneous in an ultrasound bath. However, if the authors had used a sonicator probe, they would, to my opinion, have specified it in their experimental part. Hence, your sonication bath is probably OK for the experiment. If you are sure if it is efficient enough (or if it is working properly), you should attempt a mapping of the sonication strength in the bath using an aluminum foil:
https://bandelin.com/service/applications/foil_test/?lang=en
it will allow you to verify that the sonicator is working properly and to find the position, in the sonication bath, where sonication is the most intense.
You could also have a look at this pdf that summurizes the do's and don'ts for ultrasonic cleaners
https://www.ganoksin.com/ftp/ultrasonic_notes.pdf
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