Fluorene solubility dependence

For similar coke contents the composition of coke strongly depends on the pore system of the zeolite, i.e., coking is a shape-selective process. At low coke contents, the major components are alkylbenzenes in HZSM5 and HERI, alkylnaphthalenes or fluorenes in HOFF, alkylbenzopyrenes in USHY and very polyaromatic compounds (insoluble in methylene chloride) in HMOR. At high contents, the coke components are polyaromatic in all zeolites. However, the molecules of components soluble in methylene chloride are very different as they take the size and shape of the cavities or of the channel intersections [38], as is shown in Figure 4. Whatever the coke content soluble coke molecules are trapped in cages... 

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