Kinetic study of the HDS of 4,6-DMDBT over NiMo/Al2O 3-SiO2(x) catalysts

Felipe Sánchez-Minero; Jorge Ramírez; Rogelio Cuevas-Garcia; Aida Gutierrez-Alejandre; Cesar Fernández-Vargas

doi:10.1021/ie8005808

Kinetic study of the HDS of 4,6-DMDBT over NiMo/Al₂O ₃-SiO₂(x) catalysts

Felipe Sánchez-Minero, Jorge Ramírez, Rogelio Cuevas-Garcia, Aida Gutierrez-Alejandre, Cesar Fernández-Vargas

Producción científica: Contribución a una revista › Artículo › revisión exhaustiva

16 Citas (Scopus)

Resumen

Two NiMo/Al₂O₃-SiO₂(x) catalysts with different SiO₂ content in the support (0 and 10 wt %) were evaluated at four temperatures (560, 573, 585, and 598 K) in the HDS of 4,6-DMDBT. The reaction products (DMDP, MCHT, and DMDCH) were analyzed to establish a reaction scheme. Then, a kinetic study using Langmuir-Hinshelwood (LH) type equations was carried out to estimate the changes in the rate constants for the direct desulfurization and hydrogenation reaction routes involved in the HDS of 4,6-DMDBT. The results show that incorporation of SiO₂ to the catalyst support increases the HDS of 4,6-DMDBT and that this increase is mainly due to a greater contribution of the hydrogenation reaction. The apparent activation energy and pre-exponential factor estimated for both reaction routes indicated an increase in the number of active sites related to the hydrogenation route when SiO₂ is present in the catalyst. This result was corroborated by means of NO adsorption.

Idioma original	Inglés
Páginas (desde-hasta)	1178-1185
Número de páginas	8
Publicación	Industrial and Engineering Chemistry Research
Volumen	48
N.º	3
DOI	https://doi.org/10.1021/ie8005808
Estado	Publicada - 4 feb. 2009
Publicado de forma externa	Sí

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title = "Kinetic study of the HDS of 4,6-DMDBT over NiMo/Al2O 3-SiO2(x) catalysts",

abstract = "Two NiMo/Al2O3-SiO2(x) catalysts with different SiO2 content in the support (0 and 10 wt %) were evaluated at four temperatures (560, 573, 585, and 598 K) in the HDS of 4,6-DMDBT. The reaction products (DMDP, MCHT, and DMDCH) were analyzed to establish a reaction scheme. Then, a kinetic study using Langmuir-Hinshelwood (LH) type equations was carried out to estimate the changes in the rate constants for the direct desulfurization and hydrogenation reaction routes involved in the HDS of 4,6-DMDBT. The results show that incorporation of SiO2 to the catalyst support increases the HDS of 4,6-DMDBT and that this increase is mainly due to a greater contribution of the hydrogenation reaction. The apparent activation energy and pre-exponential factor estimated for both reaction routes indicated an increase in the number of active sites related to the hydrogenation route when SiO2 is present in the catalyst. This result was corroborated by means of NO adsorption.",

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AU - Sánchez-Minero, Felipe

AU - Ramírez, Jorge

AU - Cuevas-Garcia, Rogelio

AU - Gutierrez-Alejandre, Aida

AU - Fernández-Vargas, Cesar

PY - 2009/2/4

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N2 - Two NiMo/Al2O3-SiO2(x) catalysts with different SiO2 content in the support (0 and 10 wt %) were evaluated at four temperatures (560, 573, 585, and 598 K) in the HDS of 4,6-DMDBT. The reaction products (DMDP, MCHT, and DMDCH) were analyzed to establish a reaction scheme. Then, a kinetic study using Langmuir-Hinshelwood (LH) type equations was carried out to estimate the changes in the rate constants for the direct desulfurization and hydrogenation reaction routes involved in the HDS of 4,6-DMDBT. The results show that incorporation of SiO2 to the catalyst support increases the HDS of 4,6-DMDBT and that this increase is mainly due to a greater contribution of the hydrogenation reaction. The apparent activation energy and pre-exponential factor estimated for both reaction routes indicated an increase in the number of active sites related to the hydrogenation route when SiO2 is present in the catalyst. This result was corroborated by means of NO adsorption.

AB - Two NiMo/Al2O3-SiO2(x) catalysts with different SiO2 content in the support (0 and 10 wt %) were evaluated at four temperatures (560, 573, 585, and 598 K) in the HDS of 4,6-DMDBT. The reaction products (DMDP, MCHT, and DMDCH) were analyzed to establish a reaction scheme. Then, a kinetic study using Langmuir-Hinshelwood (LH) type equations was carried out to estimate the changes in the rate constants for the direct desulfurization and hydrogenation reaction routes involved in the HDS of 4,6-DMDBT. The results show that incorporation of SiO2 to the catalyst support increases the HDS of 4,6-DMDBT and that this increase is mainly due to a greater contribution of the hydrogenation reaction. The apparent activation energy and pre-exponential factor estimated for both reaction routes indicated an increase in the number of active sites related to the hydrogenation route when SiO2 is present in the catalyst. This result was corroborated by means of NO adsorption.

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