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Effect of Metal Loading in Unpromoted and Promoted CoMo/Al2O3–TiO2 Catalysts for the Hydrodeoxygenation of Phenol

1
Departamento de Ingeniería de Procesos e Hidráulica, Universidad Autónoma Metropolitana-Iztapalapa, Av. San Rafael Atlixco No. 86, Col. Leyes de Reforma 1ª Secc., Iztapalapa, C.P. 09310 Ciudad de México, Mexico
2
Cátedras CONACyT-Área Académica de Química, Universidad Autónoma del Estado de 5 Hidalgo, Carr. Pachuca-Tulancingo Km. 4.5, C.P. 42184 Pachuca, Hidalgo, Mexico
3
Departamento de Biociencias e Ingeniería, Centro Interdisciplinario de Investigaciones y Estudios sobre Medio Ambiente y Desarrollo, Instituto Politécnico Nacional, C.P. 07340 Ciudad de Mexico, Mexico
*
Authors to whom correspondence should be addressed.
Catalysts 2019, 9(6), 550; https://doi.org/10.3390/catal9060550
Received: 29 May 2019 / Revised: 7 June 2019 / Accepted: 14 June 2019 / Published: 19 June 2019
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Abstract

This paper reports the effects of changes in the supported active phase concentration over titania containing mixed oxides catalysts for hydrodeoxygenation (HDO). Mo and CoMo supported on sol–gel Al2O3–TiO2 (Al/Ti = 2) were synthetized and tested for the HDO of phenol in a batch reactor at 5.5 MPa, 593 K, and 100 ppm S. Characterization results showed that the increase in Mo loading led to an increase in the amount of oxide Mo species with octahedral coordination (MoOh), which produced more active sites and augmented the catalytic activity. The study of the change of Co concentration allowed prototypes of the oxide species and their relationship with the CoMo/AT2 activity to be described. Catalysts were tested at four different Co/(Co + Mo) ratios. The results presented a correlation between the available fraction of CoOh and the catalytic performance. At low CoOh fractions (Co/(Co + Mo) = 0.1), Co could not promote all MoS2 slabs and metallic sites from this latter phase performed the reaction. Also, at high Co/(Co + Mo) ratios (0.3 and 0.4), there was a loss of Co species. The Co/(Co + Mo) = 0.2 ratio presented an optimum amount of available CoOh and catalytic activity since the XPS results indicated a higher concentration of the CoMoS phase than at a higher ratio. View Full-Text
Keywords: hydrodeoxygenation; phenol; Al2O3-TiO2; CoMo; CoMoS; biofuels; MoS2 hydrodeoxygenation; phenol; Al2O3-TiO2; CoMo; CoMoS; biofuels; MoS2
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Tavizón-Pozos, J.A.; Santolalla-Vargas, C.E.; Valdés-Martínez, O.U.; de los Reyes Heredia, J.A. Effect of Metal Loading in Unpromoted and Promoted CoMo/Al2O3–TiO2 Catalysts for the Hydrodeoxygenation of Phenol. Catalysts 2019, 9, 550.

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