TY - JOUR
T1 - Kinetic study of the HDS of 4,6-DMDBT over NiMo/Al2O 3-SiO2(x) catalysts
AU - Sánchez-Minero, Felipe
AU - Ramírez, Jorge
AU - Cuevas-Garcia, Rogelio
AU - Gutierrez-Alejandre, Aida
AU - Fernández-Vargas, Cesar
PY - 2009/2/4
Y1 - 2009/2/4
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.
UR - http://www.scopus.com/inward/record.url?scp=61549113740&partnerID=8YFLogxK
U2 - 10.1021/ie8005808
DO - 10.1021/ie8005808
M3 - Artículo
SN - 0888-5885
VL - 48
SP - 1178
EP - 1185
JO - Industrial and Engineering Chemistry Research
JF - Industrial and Engineering Chemistry Research
IS - 3
ER -