TY - JOUR
T1 - Effect of synthesis technique on the activity of CoNiMo tri-metallic catalyst for hydrotreating of heavy gas oil
AU - Badoga, Sandeep
AU - Ganesan, Arvind
AU - Dalai, Ajay K.
AU - Chand, Shri
N1 - Publisher Copyright:
© 2017 Elsevier B.V.
PY - 2017
Y1 - 2017
N2 - The γ-Al2O3 supported CoNiMo tri-metallic catalysts were synthesized by four different procedures involving the variation in metal impregnation sequence. The catalysts were characterized using XRD, BET, HR-TEM, H2-TPR, Raman, and CO chemisorption techniques. All catalysts were tested for the hydrotreating of bitumen-derived heavy gas oil in a continuous fixed bed reactor operating at typical industrial conditions of 9.0 MPa, 375–395 °C, 1 h−1 liquid hourly space velocity (LHSV) and gas to oil ratio of 600:1 ml/ml. The hydrotreating activity of tri-metallic catalysts is compared with that of bimetallic NiMo/γ-Al2O3 and CoMo/γ-Al2O3 catalysts. It was found that various synthesis procedures have a different impact on metal dispersion. The impregnation of Ni prior to Co results in higher dispersion of molybdenum as seen from XRD. The tri-metallic catalyst Co-NiMo/γ-Al2O3 (1.5Co 2.0Ni 13.0Mo/γ-Al2O3) synthesized has shown 8% and 38% higher hydrodesulfurization (HDS) and hydrodenitrogenation (HDN) activity as compared to that shown by bimetallic catalysts. The higher activity shown by tri-metallic CoNiMo catalysts is ascribed to the double promotional effect of Co and Ni and formation of three types of active phases NiMoS, CoMoS and Ni-CoMoS.
AB - The γ-Al2O3 supported CoNiMo tri-metallic catalysts were synthesized by four different procedures involving the variation in metal impregnation sequence. The catalysts were characterized using XRD, BET, HR-TEM, H2-TPR, Raman, and CO chemisorption techniques. All catalysts were tested for the hydrotreating of bitumen-derived heavy gas oil in a continuous fixed bed reactor operating at typical industrial conditions of 9.0 MPa, 375–395 °C, 1 h−1 liquid hourly space velocity (LHSV) and gas to oil ratio of 600:1 ml/ml. The hydrotreating activity of tri-metallic catalysts is compared with that of bimetallic NiMo/γ-Al2O3 and CoMo/γ-Al2O3 catalysts. It was found that various synthesis procedures have a different impact on metal dispersion. The impregnation of Ni prior to Co results in higher dispersion of molybdenum as seen from XRD. The tri-metallic catalyst Co-NiMo/γ-Al2O3 (1.5Co 2.0Ni 13.0Mo/γ-Al2O3) synthesized has shown 8% and 38% higher hydrodesulfurization (HDS) and hydrodenitrogenation (HDN) activity as compared to that shown by bimetallic catalysts. The higher activity shown by tri-metallic CoNiMo catalysts is ascribed to the double promotional effect of Co and Ni and formation of three types of active phases NiMoS, CoMoS and Ni-CoMoS.
KW - CoNiMo
KW - Heavy gas oil
KW - Hydrodenitrogenation
KW - Hydrodesulfurization
KW - Tri-metallic catalysts
UR - http://www.scopus.com/inward/record.url?scp=85009212074&partnerID=8YFLogxK
U2 - 10.1016/j.cattod.2017.01.005
DO - 10.1016/j.cattod.2017.01.005
M3 - Article
AN - SCOPUS:85009212074
SN - 0920-5861
VL - 291
SP - 160
EP - 171
JO - Catalysis Today
JF - Catalysis Today
ER -