Activated complex component cracking

Zeolites find major applications in catalysis. A form of the zeolite FAU is, for example, an active catalyst component in catalytic cracking of heavy hydrocarbons to produce motor gasoline and diesel. The catalyst activity arises from its Bronsted acidity, which in turn comes from the presence in the stmcture of protons attached to bridging oxygen atoms. Protons can be introduced by ion exchange of anunonium cations, followed by calcination to remove NH3 and generate the acid form of the zeolite. The process is more complex... 

This technique is mostly applied for the detection of spatial defects in anodic or cathodic protection systems on complex structures or components. Thus, attempts have been made to detect single locations in components that are usually passive but which may undergo some form of active corrosion in particular areas such as welds, crevices, pits, cracks, etc. 

---