Catalytic processing of atmospheric residue of petroleum over AlSBA-15 nanomaterials with different acidity

Coriolano, Ana C. F.; Barbosa, Gabriel F. S.; Alberto, Cleyton K. D.; Delgado, Regina C. O. B.; Castro, Késia Kelly Vieira de; Araújo, Antônio S.

doi:10.1080/10916466.2016.1156128

Cited by 12 publications

(1 citation statement)

References 10 publications

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“…Thus, by applying multiple heating rate kinetic models [40][41][42][43], the values of the apparent activation energy (Ea) for this heat treatment process were in the range of Ea = 158-162 kJ/mol for SBA-15, and from Ea = 175-243 kJ/mol for AlSBA-15. The introduction of Al onto the SBA-15 structure suggests that Al 3+ ions are present in the hexagonal structure, forming (-Si-O-Al-) interactions typical of aluminosilicate, consequently generating surface acid sites [44][45][46][47][48][49].…”

Section: Thermal Analysis Of the Supports And Catalystsmentioning

confidence: 99%

Hydrodesulfurization of Thiophene in n-Heptane Stream Using CoMo/SBA-15 and CoMo/AlSBA-15 Mesoporous Catalysts

Coutinho,

Barros,

Araujo

et al. 2024

Catalysts

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Heterogeneous catalysts containing cobalt and molybdenum supported on mesoporous materials types SBA-15 and AlSBA-15 were synthesized for application in the HDS reactions of thiophene in the n-heptane stream. The materials were synthesized by the hydrothermal method using Pluronic P123 as a template. The calcined SBA-15 and AlSBA-15 supports were submitted to co-impregnation with solutions of cobalt nitrate and ammonium heptamolybdate, aiming for the production of 15% in mass of metal loading with an atomic ratio of [Co/(Co + Mo)] = 0.45. The obtained materials were dried and calcined to obtain the mesoporous catalysts in the forms of CoMo/SBA-15 and CoMo/AlSBA-15. The catalysts were characterized by XRD, TG/DTG, SEM, and nitrogen adsorption. From XRD analysis, it was verified that after the decomposition of the cobalt and molybdenum salts, MoO3, Co3O4, and CoMoO4 oxides were formed on the supports, being attributed to these chemical species, the activity for the HDS reactions. The catalytic activity of the obtained catalysts was evaluated in a continuously flowing tubular fixed-bed microreactor coupled on-line to a gas chromatograph, using an n-heptane stream containing 12,070 ppm of thiophene (ca. 5100 ppm of sulfur) as a model compound. The synthesized catalysts presented suitable activity for the HDS reaction, and the main obtained products were cis- and trans-2-butene, 1-butene, n-butane, and low amounts of isobutane. The presence of 1,3-butadiene and tetrahydrothiophene (THT) was not detected. A mechanism of the primary and secondary reactions and subsequent formation of the olefins and paraffins in the CoMo/SBA-15 and CoMo/AlSBA-15 mesoporous catalysts was proposed, considering steps of desulfurization, hydrogenation, dehydrogenation, THT decyclization, and isomerization.

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