Abstracts Book - IMRC 2018

• SF3-O031
INFLUENCE OF pH IN THE SYNTHESIS AND PHYSICOCHEMICAL
PROPERTIES OF Al2O3-TiO2-W CATALYSTS
Gerardo Enrique Córdova 1 , Jose Gilberto Torres Torres 1 , Claudia Guadalupe Espinosa
Gonzalez 2 , Srinivas Godavarthi 2 , Filiberto Ortiz Chi 2 , Adib Abiu Silahua Pavon 1
1 Universidad Juárez Autónoma de Tabasco, Centro de Investigación de Ciencia y Tecnología
Aplicada (CICTAT), DACB, Laboratorio de Nanomateriales Catalíticos Aplicados al Desarrollo de
Fuentes de Energía y Remediación Ambiental, Mexico. 2 Cátedras CONACyT-Universidad Juárez
Autónoma de Tabasco, Centro de Investigación de Ciencia y Tecnología Aplicada (CICTAT),
DACB, Laboratorio de Nanomateriales Catalíticos Aplicados al Desarrollo de Fuentes de
Energía y Remediación Ambiental, Mexico.
Several metal oxides, such as Titania (TiO 2 ) and alumina (Al 2 O 3 ) have been
reported with excellent acid, redox and textural properties, making them a very
good choice as catalysts or supports such as in the production of alternative
fuels through biomass [1]. These oxides can acquire better catalytic
characteristics when mixed. The addition of Tungsten in mixed oxides, promotes
textural improvements therefore, the superior properties of binary oxide or
mixed oxide make it more attractive for catalytic applications [2]. In this work we
propose the sol-gel synthesis of mixed oxides Al 2 O 3 -TiO 2 -W with a variation of 5,
10, 15 and 20 % by weight of Tungsten (W) in proportion to Al 2 O 3 -TiO 2 50/50 %
w/w, low basic pH and acid, using acetic acid (pH=3) and ammonium hydroxide
(pH=9). The precursors were Aluminium-tri-sec-butoxide Al[OCH (CH 3 (CH 3
(CH 3 )C 2 H 5 ] 3 and Titanium (IV) Butoxide[Ti (OCH 2 CH 2 CH 2 CH 2 CH 3 ) 4 ). After
synthesis, materials were calcined at 500°C for 12 hours using a heating ramp
at 2°C/min. The materials were characterized by X-ray diffraction (DRX), Raman
Spectroscopy, UV-Vis spectroscopy, N 2 physisorption and scanning electron
microscopy (SEM). The results showed by the surface BET analysis: Al 2 O 3 -TiO 2
(basic pH) 389 m 2 /g and Al 2 O 3 -TiO 2 (acid pH) 412 m 2 /g, an increase was obtained
which reached a maximum in the presence of tungsten at 15% of 467 m 2 /g and
10% of 481 m 2 /g (basic acid pH and basic pH respectively). The X-ray diffraction
results of the materials Al 2 O 3 -TiO 2 -W did not show a characteristic pattern since
both results were found in amorphous materials [3] by Raman Spectroscopy the
formation of the anatase phase structure on titania was confirmed, however the
alumina and tungsten phase are not reached to be observed. The analysis SEM
showed to Al 2 O 3 , TiO 2 and W having a good dispersion but they do not have a
geometry defined as binary oxides [3, 4]. UV-Vis spectroscopy showed that the
addition of Tungsten to Al 2 O 3 -TiO 2 mixed oxides does not significantly modify