Enhanced olefin production from renewable aliphatic feedstocks and co-fed lignin derivatives using experimental surrogates by millisecond catalytic partial oxidation

Bradon J. Dreyer, Paul J. Dauenhauer, Raimund Horn, Lanny D. Schmidt

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3 Citations (Scopus)

Abstract

To investigate the effect of co-fed lignin derivatives on olefin production in the catalytic partial oxidation of aliphatic feedstocks, benzene was selected as a lignin surrogate and n-hexane was selected as a renewable oil surrogate. Aromatic benzene and aliphatic n-hexane, along with the corresponding 80:20 and 50:50 molar n-hexane/benzene mixtures, were partially oxidized in millisecond contact time reactors, varying the fuel to oxygen ratio (0.8 < C/O < 2.0), the catalyst (5 wt % Pt or Rh), the support (45 or 80 pores per linear inch a̧-Al2O3) while maintaining constant space time (GHSV=105 h-1). The experiments indicate that the addition of benzene likely results in competitive catalytic adsorption which reduces the catalytic oxidation of n-hexane and increases production of olefins by homogeneous cracking. Under optimal conditions, selectivity to ethylene and propylene from n-hexane was increased from ∼35% using pure n-hexane to ∼65% when using a 50:50 molar mixture of benzene and n-hexane. Results indicate that the addition of lignin-derived aromatic species should increase production of olefins from catalytically reformed renewable oils.

Original languageEnglish (US)
Pages (from-to)1611-1624
Number of pages14
JournalIndustrial and Engineering Chemistry Research
Volume49
Issue number4
DOIs
StatePublished - Feb 17 2010

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Lignin
Alkenes
Hexane
Feedstocks
Olefins
Benzene
Derivatives
Oxidation
Oils
Catalytic oxidation
n-hexane
Propylene
Ethylene
Oxygen
Adsorption
Catalysts

Cite this

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title = "Enhanced olefin production from renewable aliphatic feedstocks and co-fed lignin derivatives using experimental surrogates by millisecond catalytic partial oxidation",
abstract = "To investigate the effect of co-fed lignin derivatives on olefin production in the catalytic partial oxidation of aliphatic feedstocks, benzene was selected as a lignin surrogate and n-hexane was selected as a renewable oil surrogate. Aromatic benzene and aliphatic n-hexane, along with the corresponding 80:20 and 50:50 molar n-hexane/benzene mixtures, were partially oxidized in millisecond contact time reactors, varying the fuel to oxygen ratio (0.8 < C/O < 2.0), the catalyst (5 wt {\%} Pt or Rh), the support (45 or 80 pores per linear inch a̧-Al2O3) while maintaining constant space time (GHSV=105 h-1). The experiments indicate that the addition of benzene likely results in competitive catalytic adsorption which reduces the catalytic oxidation of n-hexane and increases production of olefins by homogeneous cracking. Under optimal conditions, selectivity to ethylene and propylene from n-hexane was increased from ∼35{\%} using pure n-hexane to ∼65{\%} when using a 50:50 molar mixture of benzene and n-hexane. Results indicate that the addition of lignin-derived aromatic species should increase production of olefins from catalytically reformed renewable oils.",
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T1 - Enhanced olefin production from renewable aliphatic feedstocks and co-fed lignin derivatives using experimental surrogates by millisecond catalytic partial oxidation

AU - Dreyer, Bradon J.

AU - Dauenhauer, Paul J.

AU - Horn, Raimund

AU - Schmidt, Lanny D.

PY - 2010/2/17

Y1 - 2010/2/17

N2 - To investigate the effect of co-fed lignin derivatives on olefin production in the catalytic partial oxidation of aliphatic feedstocks, benzene was selected as a lignin surrogate and n-hexane was selected as a renewable oil surrogate. Aromatic benzene and aliphatic n-hexane, along with the corresponding 80:20 and 50:50 molar n-hexane/benzene mixtures, were partially oxidized in millisecond contact time reactors, varying the fuel to oxygen ratio (0.8 < C/O < 2.0), the catalyst (5 wt % Pt or Rh), the support (45 or 80 pores per linear inch a̧-Al2O3) while maintaining constant space time (GHSV=105 h-1). The experiments indicate that the addition of benzene likely results in competitive catalytic adsorption which reduces the catalytic oxidation of n-hexane and increases production of olefins by homogeneous cracking. Under optimal conditions, selectivity to ethylene and propylene from n-hexane was increased from ∼35% using pure n-hexane to ∼65% when using a 50:50 molar mixture of benzene and n-hexane. Results indicate that the addition of lignin-derived aromatic species should increase production of olefins from catalytically reformed renewable oils.

AB - To investigate the effect of co-fed lignin derivatives on olefin production in the catalytic partial oxidation of aliphatic feedstocks, benzene was selected as a lignin surrogate and n-hexane was selected as a renewable oil surrogate. Aromatic benzene and aliphatic n-hexane, along with the corresponding 80:20 and 50:50 molar n-hexane/benzene mixtures, were partially oxidized in millisecond contact time reactors, varying the fuel to oxygen ratio (0.8 < C/O < 2.0), the catalyst (5 wt % Pt or Rh), the support (45 or 80 pores per linear inch a̧-Al2O3) while maintaining constant space time (GHSV=105 h-1). The experiments indicate that the addition of benzene likely results in competitive catalytic adsorption which reduces the catalytic oxidation of n-hexane and increases production of olefins by homogeneous cracking. Under optimal conditions, selectivity to ethylene and propylene from n-hexane was increased from ∼35% using pure n-hexane to ∼65% when using a 50:50 molar mixture of benzene and n-hexane. Results indicate that the addition of lignin-derived aromatic species should increase production of olefins from catalytically reformed renewable oils.

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