A study of the catalytic hydroconversion of biocarboxylic acids to bioalcohols using octanoic acid as model reactant

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Abstract

The catalytic hydrodeoxygenation (HDO) of octanoic acid (C 7COOH) to octene and octane was found to proceed in consecutive reaction through octyl aldehyde and octyl alcohol intermediates. Aluminosilicate and γ-alumina supported Cu and Cu,In catalysts were applied in a fixed bed flow-through reactor at 21 bar total pressure in the temperature range of 330-380 °C. The feed was 7.1% C 7COOH/84.3% H 2/He. The WHSV of the acid was 1.82 h -1. The results suggested that at lower temperatures the rate of acid hydrogenation/dehydration determined the rate of the consecutive hydroconversion process and alcohol selectivity. The reduction of aldehyde was facile, thus, the aldehyde selectivity was low under most conditions. At lower temperatures and conversions the acid coverage was high hindering the catalytic dehydration of the product alcohol. At higher temperatures and acid conversions the alcohol dehydration activity of the catalyst determined the alcohol selectivity. The indium additive was found to increase the HDO activity and the alcohol selectivity of the copper catalysts significantly. The favorable effects of indium were attributed to the formation of new catalytically active Cu 2In alloy phase.

Original languageEnglish
Pages (from-to)31-40
Number of pages10
JournalApplied Catalysis A: General
Volume439-440
DOIs
Publication statusPublished - Jul 16 2012

Keywords

  • Cu,In/aluminusilicate
  • Cu,In/γ-alumina
  • Destruction of zeolite X and P
  • Octanoic acid hydroconversion
  • Supported Cu In alloy catalyst

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

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