화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.95, 340-349, March, 2021
DOI10.1016/j.jiec.2021.01.003  Export Citation
Titanium-modified MCM-41 molecular sieves as efficient supports to increase the hydrogenation abilities of NiMoS and CoMoS catalysts
Franklin J. Méndez†, Roylena Vargas1, Joel Blanco1, Yahsé Rojas-Challa2, Esneyder Puello-Polo3, Joaquín L. Brito4, Jorge A. García-Macedo, and Ernesto Bastardo-González5
  • Departamento de Estado Sólido, Instituto de Física, Universidad Nacional Autónoma de México, Ciudad de México C.P. 04510, México, Mexico
  • 1Escuela de Ingeniería de Petróleo, Universidad de Oriente - Núcleo de Monagas, Maturín C.P. 6201, Venezuela
  • 2Departamento de Química Analítica, Facultad de Química, Universidad Nacional Autónoma de México, Ciudad de México C.P. 04510, México, Mexico
  • 3Grupo de Investigación en Oxi/Hidrotratamiento Catalítico y Nuevos Materiales, Programa de Química-Ciencias Básica, Universidad del Atlántico, Puerto Colombia C.P. 081001, Colombia
  • 4Centro de Química, Instituto Venezolano de Investigaciones Científicas, Caracas C.P. 1020A, Venezuela
  • 5School of Chemistry and Engineering, Yachay Tech University, Urcuquí C.P. 170522, Ecuador
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Ti modified MCM-41-supported NiMo and CoMo catalysts and their respective Ti free reference catalysts were prepared, characterized, and tested for the hydrodesulfurization reactions. The samples were synthesized by well-known procedures, such as liquid crystal templating and successive impregnation method for the supports and catalysts, respectively. Ti precursor was directly incorporated into the micellar solution before adding the silica precursor at different molar Si/Ti ratios (x = 75 and 50). Fourier transform infrared spectroscopy, solid-state 29Si-nuclear magnetic resonance, small- and wide-angle Xray diffraction, and nitrogen physisorption were used as characterization techniques. Four sulfided catalysts were also characterized by high-resolution transmission electron microscopy. The catalysts showed important increases in the reaction rates during both thiophene and dibenzothiophene hydrodesulfurization when the support was structurally modified with Ti-atoms. The samples supported on Ti-MCM-41(75) presented a higher activity than those supported on Ti-MCM-41(50), and they were superior to their respective Si-MCM-41-supported NiMoS and CoMoS catalysts, even NiMoTiM75 and CoMoTiM75 catalysts presented better performance compared to the conventional NiMo/Al2O3 and CoMo/Al2O3 catalysts in the DBT hydrodesulfurization. Ti incorporation also enhanced the selectivities to the hydrogenated products, which could be beneficial to destabilize refractory S-containing molecules.
Keywords:Dibenzothiophene;Hydrodesulfurization;MCM-41;Ni(Co)MoS catalysts;Thiophene;Ti-MCM-41
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