TY - JOUR
T1 - Kinetics of HDS and of the inhibitory effect of quinoline on HDS of 4,6-DMDBT over a Ni-Mo-P/Al 2O 3 catalyst
T2 - Part I
AU - García-Martínez, J. C.
AU - Castillo-Araiza, C. O.
AU - De los Reyes Heredia, J. A.
AU - Trejo, E.
AU - Montesinos, A.
PY - 2012/11/1
Y1 - 2012/11/1
N2 - The kinetic effect of quinoline (Q) and its reaction by-products, i.e. 1,2,3,4-tetrahydroquinoline (1,4-THQ), decahydroquinoline (DHQ) and orthopropylaniline (OPA), on the hydrodesulfurization (HDS) of 4,6-dimethyldibenzothiophene (4,6-DMDBT) was studied in the presence of a commercial NiMoP/Al 2O 3 catalyst under operating conditions relevant to industrial applications. Kinetic observations and modelling based on a Langmuir-Hinshelwood-Hougen-Watson (LHHW) mechanism, accounting for most of the observed Q and 4,6-DMDBT by-products, indicated that Q, 1,4-THQ and DHQ are the main HDS reaction inhibitors, even at nitrogen concentrations as low as 25ppm. To some extent Q and 1,4-THQ were adsorbed favorably on the HDS catalytic active sites, being more reactive than most of the sulfur and nitrogen-containing molecules. Besides, DHQ was less reactive than Q and 1,4-THQ, despite a significant adsorption affinity on the HDS catalytic active sites. As a consequence, Q and 1,4-THQ inhibited HDS reactions at lower Q conversions, whereas DHQ inhibited them at higher Q conversions.
AB - The kinetic effect of quinoline (Q) and its reaction by-products, i.e. 1,2,3,4-tetrahydroquinoline (1,4-THQ), decahydroquinoline (DHQ) and orthopropylaniline (OPA), on the hydrodesulfurization (HDS) of 4,6-dimethyldibenzothiophene (4,6-DMDBT) was studied in the presence of a commercial NiMoP/Al 2O 3 catalyst under operating conditions relevant to industrial applications. Kinetic observations and modelling based on a Langmuir-Hinshelwood-Hougen-Watson (LHHW) mechanism, accounting for most of the observed Q and 4,6-DMDBT by-products, indicated that Q, 1,4-THQ and DHQ are the main HDS reaction inhibitors, even at nitrogen concentrations as low as 25ppm. To some extent Q and 1,4-THQ were adsorbed favorably on the HDS catalytic active sites, being more reactive than most of the sulfur and nitrogen-containing molecules. Besides, DHQ was less reactive than Q and 1,4-THQ, despite a significant adsorption affinity on the HDS catalytic active sites. As a consequence, Q and 1,4-THQ inhibited HDS reactions at lower Q conversions, whereas DHQ inhibited them at higher Q conversions.
KW - 4,6-Dimethyldibenzothiophene
KW - Hydrodenitrogenation
KW - Hydrodesulfurization
KW - NiMoP/Al O catalyst
KW - Quinoline
UR - http://www.scopus.com/inward/record.url?scp=84866152236&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2012.08.048
DO - 10.1016/j.cej.2012.08.048
M3 - Artículo
SN - 1385-8947
VL - 210
SP - 53
EP - 62
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
ER -