Stability and activity maintenance of sol-gel Ni-MxOy (M=Ti, Zr, Ta) catalysts during continuous gasification of glycerol in supercritical water

Sha Li, Phillip E. Savage, Liejin Guo

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)137-147
Number of pages11
JournalJournal of Supercritical Fluids
Volume148
DOIs
StatePublished - Jun 2019

All Science Journal Classification (ASJC) codes

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

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