On the deactivation of bimetallic reforming catalyst

Characterization of coke deposited on Pt/alumina catalyst during reforming of liquid hydrocarbons

“…''Soft'' coke can be gasified by treatment in hydrogen at relatively mild conditions and does not accumulate on the active sites [10,13]. Soft coke is thought to consist of secondary reaction products or intermediates, such as polyarenes [14] or polyenes [15]. ''Hard'' coke is typically graphitic, unreactive with hydrogen, and blocks active sites.…”