Ferrierite zeolite passivation and its catalytic application in toluene disproportionation
Registro en:
instname:Universidad de Bogotá Jorge Tadeo Lozano
reponame:Repositorio Institucional de la Universidad de Bogotá Jorge Tadeo Lozano
Autor
Mesa, S.
Arboleda, J.
Echavarría, A.
López-Suárez, F.E.
Institución
Resumen
Ferrierite zeolites have been prepared, characterized and evaluated in toluene disproportionation. The
materials were synthesized using a hydrothermal method. A passivation process (chemical liquid deposition,
CLD) was applied in order to modify the acidic properties of parent zeolite and the shape-selective
performance in the production of p-xylene by the disproportionation of toluene. The catalyst structures
and chemical compositions were characterized by SEM, XRD, XRF, TGA, DTA, nitrogen adsorption/desorption,
and NH3-TPD measurements. Textural properties and acidity of ferrierite zeolites were changed by
the passivation procedure. The strength and amount of acid sites on the materials diminished with
increasing the modification cycles in the passivation process. In toluene disproportionation, the passivated
materials were substantially more para-selective (56% at 648 K and 689.5 KPa) than the parent zeolite
(H-form). Overall, the temperature and pressure ranges evaluated were from 689.5 to 2757.9 KPa and
648–698 K.