| abstract |
The method for forming the composite zeolite catalyst is to form a silica intermediate gel by combining a silicon source and an aqueous organic structure directing agent having a polyaminocation compound, and to introduce an aluminum precursor into the silica intermediate gel to form a catalyst. Forming a precursor gel, evaporating the water in the catalyst precursor gel to form a catalyst gel, and heating the catalyst gel to contain a mixture of both beta and ZSM-5 crystals. Includes forming composite zeolite catalytic particles with crystalline regions. A related method for producing xylene is to supply the heavy reformate to a reactor containing a composite zeolite catalyst, and to simultaneously perform dealkylation and transalkylation of the heavy reformate in the reactor. Each composite zeolite catalytic particle can catalyze both a dealkylation reaction and a transalkylation reaction, including producing xylene. |