Triblock Copolymer Effect During the Synthesis of ZrO2-TiO2 Mixed Oxides Supports for NiW Hydrodesulfurization Catalysts
Por:
Soto-Arteaga, C. E., Guzman-Cruz, M. A., Esqueda-Barron, Y., Alonso-Nunez, Gabriel, Zepeda, T. A., Fuentes-Moyado, S., Diaz de Leon, J. N.
Publicada:
1 sep 2022
Resumen:
Surfactant addition during support synthesis resulted in materials with
defined porosity, smaller particle size, and the absence of segregated
ZrO2 and TiO2 crystalline phases at least to the XRD detection limit.
The data obtained by N-2 physisorption showed improved textural
properties compared with the individual pure oxides. The
Ultraviolet-visible (UV-Vis) diffuse spectroscopy revealed broadband
assigned to the mixed-phase. Meanwhile, the micrographs obtained by
transmission electron microscopy showed nanometric domains of
crystallinity and a worm-like morphology in all the samples. Raman
spectroscopy showed the possible formation of the TiZrO4 forming the
mixed oxides support. The chemical analysis performed by ICP-OES
corroborates the expected equimolar relation Zr/Ti and the atomic ratio
Ni/(Ni + W) approximately equal to 0.31. The support properties
intrinsically influenced the WS2 nano slabs, as observed by TEM
micrographs for the NiW/ZT-x sulfided series. The XPS analysis revealed
that sulfidation degree increases and the highest amount of NiWS phase
among all the materials are observed when the NiW system is deposited on
the mixed oxides prepared with pluronic. The latter was also related to
the reaction rates, where the sulfided NiW/ZT-x catalysts presented
higher values than the NiW/ZT reference material. NiW/ZT-P sulfided
sample showed the maximum reaction rate among the series studied.
Filiaciones:
Soto-Arteaga, C. E.:
Univ Nacl Autonoma Mexico, Ctr Nanociencias & Nanotecnol, Carretera Tijuana Ensenada Km 107, Ensenada 22800, Baja California, Mexico
Ctr Invest Cient & Educ Super Ensenada, Posgrado Nanociencias, Carretera Ensenada Tijuana 3918, Ensenada 2280, Baja California, Mexico
Guzman-Cruz, M. A.:
Univ Juarez Autonoma Tabasco, Div Acad Multidisciplinaria Jalpa Mendez, Carretera Estatal Libre Villahermosa Comalcalco K, Jalpa De Mendez 86205, Tabasco, Mexico
Esqueda-Barron, Y.:
Univ Nacl Autonoma Mexico, Ctr Nanociencias & Nanotecnol, Carretera Tijuana Ensenada Km 107, Ensenada 22800, Baja California, Mexico
Alonso-Nunez, Gabriel:
Univ Nacl Autonoma Mexico, Ctr Nanociencias & Nanotecnol, Carretera Tijuana Ensenada Km 107, Ensenada 22800, Baja California, Mexico
Zepeda, T. A.:
Univ Nacl Autonoma Mexico, Ctr Nanociencias & Nanotecnol, Carretera Tijuana Ensenada Km 107, Ensenada 22800, Baja California, Mexico
Fuentes-Moyado, S.:
Univ Nacl Autonoma Mexico, Ctr Nanociencias & Nanotecnol, Carretera Tijuana Ensenada Km 107, Ensenada 22800, Baja California, Mexico
Diaz de Leon, J. N.:
Univ Nacl Autonoma Mexico, Ctr Nanociencias & Nanotecnol, Carretera Tijuana Ensenada Km 107, Ensenada 22800, Baja California, Mexico
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