Abstracts Book - IMRC 2018

• SF3-O009
SOLVENT EFFECT OVER WASHED SPENT CATALYST NiMoP/Al2O3
FOR HYDRODESULFURIZATION OF DIBENZOTHIOPHENE
Carlos Eduardo Santolalla Vargas 1 , Victor Santes 1 , Janeth Vera Flores 1 , Ines Castillo Delgadillo 1 ,
Felipe Sanchez 2 , Issis Claudette Romero Ibarra 3 , Leonardo Diaz 4 , Rosario Luna Ramírez 4 , Omar
U. Valdés 5 , Jose Antonio de Los Reyes 5
1 Instituto Politécnico Nacional - IPN, Departamento de Biociencias e Ingeniería del Centro
Interdisciplinario de Investigaciones y Estudios sobre Medio Ambiente y Desarrollo (CIIEMAD),
Mexico. 2 Instituto Politécnico Nacional - IPN, Departamento de Ingeniería Química Petrolera
(ESIQIE), Mexico. 3 Instituto Politécnico Nacional - IPN, Unidad Profesional Interdisciplinaria en
Ingeniería y Tecnologías Avanzadas, Mexico. 4 Instituto Mexicano del Petróleo, Instituto
Mexicano del Petróleo, Mexico. 5 Universidad Autónoma Metropolitana, Área de Ingeniería
Química, Mexico.
A series of NiMoP catalysts supported on alumina was washed using five
solvents to remove the coke deposited after hydrodesulfurization reaction of
gas oil. Xylene, acetone, toluene, hexane, and methanol were used as solvents
to remove carbon on the catalytic surface. The catalysts were characterized by
Uv-vis spectroscopy and Raman spectroscopy The catalysts were tested in the
hydrodesulfurization (HDS) of dibenzothiophene (dbt) and compared with a
spent catalyst without washed as reference. The Uv vis spectroscopy results for
the washed solutions exhibited wide bands corresponding to Ni electronic
transitions and Mo charge transfer. However, hexane solution no presented
bands related to Ni and Mo species. These results suggest that hexane keep the
Ni and Mo metals while the others solvents could be leaching the spent catalyst.
On the other hand, the Raman results showed a band about 1600 cm-1
corresponding to coke with high crystallization for all catalysts. Also, the
intensity band decreased after treatment with the different solvents. In this
sense, the catalysts washed with hexane presented the lowest intensity in
comparison with the others solvents and catalyst reference. This result could
suggest that the catalysts washed with hexane removed higher carbon surface
concentration than the others solvents. The highest activity for NiMoP materials
was found when the spent catalyst was washed with acetone. This result is
related to moderate removes of carbon and avoiding for the Ni and Mo leaching.
To verify the coke evolution, the XPS, TEM, NMR and TPR experiments are
currently underway to verify this point.