TY - JOUR
T1 - Effectiveness of different transition metal dispersed catalysts for in situ heavy oil upgrading
AU - Al-Marshed, Abdullah
AU - Hart, Abarasi
AU - Leeke, Gary
AU - Greaves, Malcolm
AU - Wood, Joseph
PY - 2015
Y1 - 2015
N2 - Ultradispersed particles of a size less than 100 nm for in situ catalytic upgrading have been reported to outperform the augmented catalytic upgrading achieved by incorporating pelleted refinery catalyst to the horizontal production well of the toe-to-heel air injection (THAI) process. Hydroconversion of heavy oil was carried out in a stirred batch reactor at 425 °C, 50 bar (initial H2 pressure), 900 rpm, and 60 min reaction time using a range of unsupported transition metal (Mo, Ni, and Fe) catalysts. The effect of metal nanoparticles (NPs) was evaluated in terms of product distribution, physical properties, and product quality. The produced coke and recovered catalysts were also studied. The levels of API gravity and viscosity of the upgraded oils observed with the NPs was approximately 21° API and 108 cP compared with thermal cracking alone (24° API and 53.5 cP); this moderate upgrade with NPs is due to the lack of cracking functionality offered by supports such as zeolite, alumina, or silica. However, it was found that the presence of dispersed NPs significantly suppressed coke formation: 4.4 wt % (MoS2), 5.7 wt % (NiO), and 6.8 wt % (Fe2O3) compared to 12 wt % obtained with thermal cracking alone. The results also showed that with dispersed unsupported metal NPs in sulfide form the middle distillate (177-343 °C) of the upgraded oil was improved, particularly with MoS2, which gave 50 wt % relative to 43 wt % (thermal cracking) and 28 wt % (feed oil). The middle distillate yields for Fe2O3 and NiO are 47 and 49 wt %, respectively. Hence, iron- and nickel-based unsupported NPs showed similar activity when compared to the activity of MoS2. The cost and availability of iron-based catalysts compared to those of Ni and Mo for heavy oil upgrading are advantages that may justify its preference. Furthermore, the X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses showed that introducing dispersed catalysts to the upgrading helped to produce sponge-type coke that could be used as industrial fuel compared to shot-type obtained upon thermal cracking.
AB - Ultradispersed particles of a size less than 100 nm for in situ catalytic upgrading have been reported to outperform the augmented catalytic upgrading achieved by incorporating pelleted refinery catalyst to the horizontal production well of the toe-to-heel air injection (THAI) process. Hydroconversion of heavy oil was carried out in a stirred batch reactor at 425 °C, 50 bar (initial H2 pressure), 900 rpm, and 60 min reaction time using a range of unsupported transition metal (Mo, Ni, and Fe) catalysts. The effect of metal nanoparticles (NPs) was evaluated in terms of product distribution, physical properties, and product quality. The produced coke and recovered catalysts were also studied. The levels of API gravity and viscosity of the upgraded oils observed with the NPs was approximately 21° API and 108 cP compared with thermal cracking alone (24° API and 53.5 cP); this moderate upgrade with NPs is due to the lack of cracking functionality offered by supports such as zeolite, alumina, or silica. However, it was found that the presence of dispersed NPs significantly suppressed coke formation: 4.4 wt % (MoS2), 5.7 wt % (NiO), and 6.8 wt % (Fe2O3) compared to 12 wt % obtained with thermal cracking alone. The results also showed that with dispersed unsupported metal NPs in sulfide form the middle distillate (177-343 °C) of the upgraded oil was improved, particularly with MoS2, which gave 50 wt % relative to 43 wt % (thermal cracking) and 28 wt % (feed oil). The middle distillate yields for Fe2O3 and NiO are 47 and 49 wt %, respectively. Hence, iron- and nickel-based unsupported NPs showed similar activity when compared to the activity of MoS2. The cost and availability of iron-based catalysts compared to those of Ni and Mo for heavy oil upgrading are advantages that may justify its preference. Furthermore, the X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses showed that introducing dispersed catalysts to the upgrading helped to produce sponge-type coke that could be used as industrial fuel compared to shot-type obtained upon thermal cracking.
UR - http://www.scopus.com/inward/record.url?scp=84946780388&partnerID=8YFLogxK
UR - http://dx.doi.org/10.1021/acs.iecr.5b02953
U2 - 10.1021/acs.iecr.5b02953
DO - 10.1021/acs.iecr.5b02953
M3 - Article
AN - SCOPUS:84946780388
SN - 0888-5885
VL - 54
SP - 10645
EP - 10655
JO - Industrial & Engineering Chemistry Research
JF - Industrial & Engineering Chemistry Research
IS - 43
ER -