TY - JOUR
T1 - Stability and activity maintenance of sol-gel Ni-MxOy (M=Ti, Zr, Ta) catalysts during continuous gasification of glycerol in supercritical water
AU - Li, Sha
AU - Savage, Phillip E.
AU - Guo, Liejin
N1 - Funding Information:
The authors thank Dr. Thomas Yeh, Dr. Jacob G. Dickinson, Dr. Shijian Zhou, and Dr. Chad M. Huelsman for experimental assistance. We acknowledge the financial support from the University of Michigan College of Engineering, the National Key R&D Program of China (No. 2016YFB0600100 ), the China Postdoctoral Science Foundation (No. 2017M611817 ) and the Fundamental Research Funds for the Central Universities (No. 30917011326 ). We also thank the China Scholarship Council for support.
Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2019/6
Y1 - 2019/6
N2 - The long-term stability of activities and physicochemical properties for nickel nanoparticles supported on TiO2, ZrO2 and Ta2O5 prepared by sol-gel methods, was evaluated for continuous supercritical water gasification (SCWG) of 3 wt.% glycerol at 425 °C and 25.2 MPa. The Ni/TiO2 catalyst bed gradually deactivated while the Ni/ZrO2 and Ni/Ta2O5 catalyst beds showed persistent and high carbon gasification efficiency for 80 h operation. Characterization results verified that property stabilization of the sol-gel Ni/ZrO2 and Ni/Ta2O5 catalysts occurred in the long-term SCWG flow, indicating a “catalyst in-situ activation” effect that enhanced the activity and coking resistance of the as-prepared sol-gel catalysts for continuous SCWG. Results also indicate that sintering of Ni with the supports to form new phases and metal leaching of the catalyst materials in the SCW flow may be key deactivation factors of the catalyst beds.
AB - The long-term stability of activities and physicochemical properties for nickel nanoparticles supported on TiO2, ZrO2 and Ta2O5 prepared by sol-gel methods, was evaluated for continuous supercritical water gasification (SCWG) of 3 wt.% glycerol at 425 °C and 25.2 MPa. The Ni/TiO2 catalyst bed gradually deactivated while the Ni/ZrO2 and Ni/Ta2O5 catalyst beds showed persistent and high carbon gasification efficiency for 80 h operation. Characterization results verified that property stabilization of the sol-gel Ni/ZrO2 and Ni/Ta2O5 catalysts occurred in the long-term SCWG flow, indicating a “catalyst in-situ activation” effect that enhanced the activity and coking resistance of the as-prepared sol-gel catalysts for continuous SCWG. Results also indicate that sintering of Ni with the supports to form new phases and metal leaching of the catalyst materials in the SCW flow may be key deactivation factors of the catalyst beds.
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U2 - 10.1016/j.supflu.2019.02.028
DO - 10.1016/j.supflu.2019.02.028
M3 - Article
AN - SCOPUS:85063063962
SN - 0896-8446
VL - 148
SP - 137
EP - 147
JO - Journal of Supercritical Fluids
JF - Journal of Supercritical Fluids
ER -