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

Szabolcs Harnos, G. Onyestyák, J. Valyon

Research output: Contribution to journalArticle

11 Citations (Scopus)

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 - 2012

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Alcohols
Acids
Dehydration
Aldehydes
Indium
Catalyst selectivity
Catalysts
Octanols
Temperature
Aluminum Oxide
Aluminosilicates
Hydrogenation
Copper
Catalyst activity
Thermodynamic properties
octanoic acid
Alumina

Keywords

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

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

Cite this

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title = "A study of the catalytic hydroconversion of biocarboxylic acids to bioalcohols using octanoic acid as model reactant",
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.",
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AU - Onyestyák, G.

AU - Valyon, J.

PY - 2012

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N2 - 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.

AB - 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.

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KW - Supported Cu In alloy catalyst

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