State of Supported Nickel Nanoparticles during Catalysis in Aqueous Media

Zizwe A. Chase, Stanislav Kasakov, Hui Shi, Aleksei Vjunov, John L. Fulton, Donald M. Camaioni, Mahalingam Balasubramanian, Chen Zhao, Yong Wang, Johannes A. Lercher

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14 Scopus citations

Abstract

The state of Ni supported on HZSM-5 zeolite, silica, and sulfonated carbon was studied during aqueous-phase catalysis of phenol hydrodeoxygenation using in situ extended X-ray absorption fine structure spectroscopy. On sulfonated carbon and HZSM-5 supports, NiO and Ni(OH)2 were readily reduced to Ni0 under reaction conditions (≈35 bar H2 in aqueous phenol solutions containing up to 0.5 wt. % phosphoric acid at 473 K). In contrast, Ni supported on SiO2 was not stable in a fully reduced Ni0 state. Water enables the formation of NiII phyllosilicate, which is more stable, that is, difficult to reduce, than either α-Ni(OH)2 or NiO. Leaching of Ni from the supports was not observed over a broad range of reaction conditions. Ni0 particles on HZSM-5 were stable even in presence of 15 wt. % acetic acid at 473 K and 35 bar H2.

Original languageEnglish
Pages (from-to)16541-16546
Number of pages6
JournalChemistry - A European Journal
Volume21
Issue number46
DOIs
StatePublished - 1 Nov 2015

Keywords

  • EXAFS
  • XANES
  • hydrogenation
  • nanoparticles
  • nickel

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