Applications of CoMo/calcined quaternary hydrotalcites for hydrotreatment reactions

• Published in: Fuel processing technology 2015-04, Vol.132, p.105-110
• Main Authors: Linares, Carlos F., Vásquez, Maryuri, Castillo, Rafhael, Bretto, Pablo, Solano, Roger, Rincón, Anaís
• Format: Article
• Language: English
• Subjects: Cyclohexene; Diffraction; Hydrodesulfurization; Hydrogenation; Infrared spectroscopy; Precursors; Quaternary hydrotalcite; Roasting; Surface area; Thiophene; Thiophenes; X-ray diffraction
• ISSN: 0378-3820; 1873-7188
• DOI: 10.1016/j.fuproc.2014.12.043

Co2+, Ni2+, Zn2+ and Al3+ quaternary hydrotalcite-type materials were synthesized at: 0.33; 0.25 and 0.20 (M3+)/(M3++M2+) ratios. Then, these as-synthesized hydrotalcites were calcined and impregnated with Mo (15wt.% MoO3) and Co (3Mo:Co) to obtain the catalytic precursors. As-synthesized and impregnated calcined hydrotalcites were characterized by different physico-chemical techniques such as: X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), BET surface area measurements and NH3-temperature programmed desorption (NH3-TPD). Finally, CoMo/calcined hydrotalcites were tested in hydrodesulfurization (HDS) and hydrogenation (HYS) reactions of thiophene and cyclohexene. Results showed that the 0.25 (M3+)/(M3++M2+) ratio was the most active for the HDS reaction of thiophene, while the 0.33 (M3+)/(M3++M2+) ratio showed the best performance for the HYD reaction of cyclohexene. Conversion and selectivity (HDS/HYD) of CoMo/(calcined quaternary hydrotalcites) catalysts for hydrodesulfurization of thiophene and hydrogenation of cyclohexene [Display omitted] •Preparation of Co2+, Ni2+, Zn2+ and Al3+ quaternary hydrotalcite-type materials•High activity toward hydrodesulfurization (HDS) reactions•Low activity toward hydrogenation (HYD) reactions