Abstract

Controlled flow cavitation (CFC) is evaluated as a process intensification method for the synthesis and conditioning of high performance catalyst materials. The method couples rapid precipitation or reduction with pressure driven cavitation so that micromixing, bubble collapse, shear, microjet impact, fragmentation, interfacial renewal, and transient thermal effects act on reactive intermediates before extensive aging. This article integrates hydrodynamic and materials frameworks for interpreting catalyst formation, including pressure and velocity relations, cavitation number, bubble dynamics, hydraulic energy, residence time, micromixing, supersaturation, nucleation, and diffraction based structural metrics. Reported CFC results are reviewed for perovskites, copper-zinc-aluminum oxides, cobalt molybdate, supported gold, silver, platinum, bismuth molybdate, titania, lead zirconate titanate, nanocalcite, nano ZnO, iron oxide, and catalyst slurries. The evidence indicates that CFC can improve phase homogeneity, control crystallite and agglomerate size, modify microstrain, and increase dispersion in selected systems, but responses are often nonmonotonic and strongly coupled to precursor chemistry, pressure recovery, solids loading, residence history, washing, drying, and activation. Structural improvement does not by itself establish catalytic improvement; active state characterization, intrinsic kinetics, selectivity, stability, and transport controls remain necessary. Experimental design, scale up, process analytical technology, safety, erosion, energy, and product equivalence requirements are also defined. Scale up should preserve material forming history and active state performance rather than nominal pressure or cavitation number alone.