Acetic acid hydroconversion to ethanol over supported nickel and indium-modified nickel catalysts

György Onyestyák, Szabolcs Harnos, Szilvia Klébert, Magdalena Stolcová, Alexander Kaszonyi, Dénes Kalló

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Volatile carboxylic acids (mainly acetic acid) can be produced efficiently by simple thermochemical or biological degradation of various biomasses. For the processing of such oxygenates in hydrogen atmosphere, acetic acid (AA) hydroconversion was studied in detail over zeolite-based Ni and bimetallic InNi catalysts in a flow-through reactor at 21 bar total pressure and 240-380°C. Efficient hydrogenating contacts were already obtained by in situ reduction of Ni-zeolites (A, X, P) and mainly co-reduction of their mixtures with In2O3 in H2 flow at 21 bar and 450°C. Under these conditions, the bulk of charge-compensating nickel cations remained unreduced and therefore a large portion of the microporous zeolite structure was still preserved. Modification of the formed Ni particles with indium quest metal generated bimetallic NiIn/Ni,H-zeolite catalysts having higher hydroconversion activity with much lowered hydrodecarbonylation and with enhanced ethanol selectivity than the parent partially destructed Ni/Ni,H-zeolite. The activity dependence on the reactant partial pressure denotes rate-controlling surface reaction according to the Langmuir-Hinshelwood mechanism.

Original languageEnglish
Pages (from-to)9181-9193
Number of pages13
JournalResearch on Chemical Intermediates
Volume41
Issue number12
DOIs
Publication statusPublished - Dec 1 2015

Keywords

  • Acetic acid reduction
  • Bimetallic catalysts
  • Cu-forms
  • H-zeolites
  • NiIn/Ni

ASJC Scopus subject areas

  • Chemistry(all)

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