Stability and activity maintenance of Al2O3- and carbon nanotube-supported Ni catalysts during continuous gasification of glycerol in supercritical water

Sha Li, Phillip E. Savage, Liejin Guo

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9 Citations (Scopus)

Abstract

We have evaluated the long-term stability of activities and physicochemical properties for nickel nanoparticles supported on Mg-promoted γ-Al2O3 (MgAl2O4-Al2O3), α-Al2O3, and multi-wall carbon nanotubes (CNTs) for supercritical water gasification (SCWG) in a continuous flow reactor at 425 °C, 25.2 MPa, using 9 wt.% glycerol as the feed. Ni/CNT achieved the lowest H2 yields but produced consistent carbon gasification efficiencies (CGEs) ∼80% during 48 h of operation at steady state, whereas the CGEs from Ni/α-Al2O3 and Ni/MgAl2O4-Al2O3 decreased to <80% when the gasification was extended to 48 h. Characterization results indicated that CNTs showed stable pore structures and Ni/CNT showed the best dissolution resistance of Ni in SCW. Persistent loss of Al into SCW probably contributed to the deactivation of Al2O3-supported Ni catalyst beds. Results also suggest that enhanced interaction of Ni and the supports may be beneficial for reducing dissolution of Ni in SCW.

Original languageEnglish (US)
Pages (from-to)188-197
Number of pages10
JournalJournal of Supercritical Fluids
Volume135
DOIs
StatePublished - May 1 2018

Fingerprint

Carbon Nanotubes
gasification
glycerols
Glycerol
Gasification
maintenance
Carbon nanotubes
carbon nanotubes
catalysts
Catalysts
Water
water
dissolving
Dissolution
Carbon
carbon
Pore structure
Nickel
deactivation
beds

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

Cite this

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title = "Stability and activity maintenance of Al2O3- and carbon nanotube-supported Ni catalysts during continuous gasification of glycerol in supercritical water",
abstract = "We have evaluated the long-term stability of activities and physicochemical properties for nickel nanoparticles supported on Mg-promoted γ-Al2O3 (MgAl2O4-Al2O3), α-Al2O3, and multi-wall carbon nanotubes (CNTs) for supercritical water gasification (SCWG) in a continuous flow reactor at 425 °C, 25.2 MPa, using 9 wt.{\%} glycerol as the feed. Ni/CNT achieved the lowest H2 yields but produced consistent carbon gasification efficiencies (CGEs) ∼80{\%} during 48 h of operation at steady state, whereas the CGEs from Ni/α-Al2O3 and Ni/MgAl2O4-Al2O3 decreased to <80{\%} when the gasification was extended to 48 h. Characterization results indicated that CNTs showed stable pore structures and Ni/CNT showed the best dissolution resistance of Ni in SCW. Persistent loss of Al into SCW probably contributed to the deactivation of Al2O3-supported Ni catalyst beds. Results also suggest that enhanced interaction of Ni and the supports may be beneficial for reducing dissolution of Ni in SCW.",
author = "Sha Li and Savage, {Phillip E.} and Liejin Guo",
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T1 - Stability and activity maintenance of Al2O3- and carbon nanotube-supported Ni catalysts during continuous gasification of glycerol in supercritical water

AU - Li, Sha

AU - Savage, Phillip E.

AU - Guo, Liejin

PY - 2018/5/1

Y1 - 2018/5/1

N2 - We have evaluated the long-term stability of activities and physicochemical properties for nickel nanoparticles supported on Mg-promoted γ-Al2O3 (MgAl2O4-Al2O3), α-Al2O3, and multi-wall carbon nanotubes (CNTs) for supercritical water gasification (SCWG) in a continuous flow reactor at 425 °C, 25.2 MPa, using 9 wt.% glycerol as the feed. Ni/CNT achieved the lowest H2 yields but produced consistent carbon gasification efficiencies (CGEs) ∼80% during 48 h of operation at steady state, whereas the CGEs from Ni/α-Al2O3 and Ni/MgAl2O4-Al2O3 decreased to <80% when the gasification was extended to 48 h. Characterization results indicated that CNTs showed stable pore structures and Ni/CNT showed the best dissolution resistance of Ni in SCW. Persistent loss of Al into SCW probably contributed to the deactivation of Al2O3-supported Ni catalyst beds. Results also suggest that enhanced interaction of Ni and the supports may be beneficial for reducing dissolution of Ni in SCW.

AB - We have evaluated the long-term stability of activities and physicochemical properties for nickel nanoparticles supported on Mg-promoted γ-Al2O3 (MgAl2O4-Al2O3), α-Al2O3, and multi-wall carbon nanotubes (CNTs) for supercritical water gasification (SCWG) in a continuous flow reactor at 425 °C, 25.2 MPa, using 9 wt.% glycerol as the feed. Ni/CNT achieved the lowest H2 yields but produced consistent carbon gasification efficiencies (CGEs) ∼80% during 48 h of operation at steady state, whereas the CGEs from Ni/α-Al2O3 and Ni/MgAl2O4-Al2O3 decreased to <80% when the gasification was extended to 48 h. Characterization results indicated that CNTs showed stable pore structures and Ni/CNT showed the best dissolution resistance of Ni in SCW. Persistent loss of Al into SCW probably contributed to the deactivation of Al2O3-supported Ni catalyst beds. Results also suggest that enhanced interaction of Ni and the supports may be beneficial for reducing dissolution of Ni in SCW.

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