Deactivation study of the hydrodeoxygenation of p-methylguaiacol over silica supported rhodium and platinum catalysts

F.P. Bouxin, X. Zhang, I.N. Kings, A.F. Lee, M.J.H. Simmons, K. Wilson, S.D. Jackson

Research output: Contribution to journalArticle

Abstract

Hydrodeoxygenation of para-methylguaiacol using silica supported Rh or Pt catalysts was investigated using a fixed-bed reactor at 300 °C, under 4 barg hydrogen and a WHSV of 2.5 h−1. The activity, selectivity and deactivation of the catalysts were examined in relation to time on stream. Three catalysts were tested: 2.5% Rh/silica supplied by Johnson Matthey (JM), 2.5% Rh/silica and 1.55% Pt/silica both prepared in-house. The Rh/silica (JM) showed the best stability with steady-state reached after 6 h on stream and a constant activity over 3 days of reaction. In contrast the other two catalysts did not reach steady state within the timeframe of the tests, with continuous deactivation over the time on stream. Nevertheless higher coking was observed on the Rh/silica (JM) catalyst, while all three catalysts showed evidence of sintering. The Pt catalyst (A) showed higher selectivity for the production of 4-methylcatechol while the Rh catalysts were more selective toward the cresols. In all cases, complete hydrodeoxygenation of the methylguaiacol to methylcyclohexane was not observed.

Original languageEnglish
Pages (from-to)29-37
Number of pages9
JournalApplied Catalysis A: General
Volume539
Early online date31 Mar 2017
DOIs
Publication statusPublished - 5 Jun 2017

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Rhodium
Platinum
Silicon Dioxide
Silica
Catalysts
Catalyst selectivity
Cresols
Coking
Hydrogen
Catalyst activity
Sintering

Bibliographical note

© the authors. Creative Commons By Attribution

Funding: EPSRC (grants EP/K014706/1, EP/K014668/1, EP/K014854/1, EP/K014714/1 and EP/M013219/1).

Keywords

  • deactivation
  • hydrodeoxygenation
  • p-methylguaiacol
  • platinum
  • rhodium

Cite this

Bouxin, F.P. ; Zhang, X. ; Kings, I.N. ; Lee, A.F. ; Simmons, M.J.H. ; Wilson, K. ; Jackson, S.D. / Deactivation study of the hydrodeoxygenation of p-methylguaiacol over silica supported rhodium and platinum catalysts. In: Applied Catalysis A: General. 2017 ; Vol. 539. pp. 29-37.
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Deactivation study of the hydrodeoxygenation of p-methylguaiacol over silica supported rhodium and platinum catalysts. / Bouxin, F.P.; Zhang, X.; Kings, I.N.; Lee, A.F.; Simmons, M.J.H.; Wilson, K.; Jackson, S.D.

In: Applied Catalysis A: General, Vol. 539, 05.06.2017, p. 29-37.

Research output: Contribution to journalArticle

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T1 - Deactivation study of the hydrodeoxygenation of p-methylguaiacol over silica supported rhodium and platinum catalysts

AU - Bouxin, F.P.

AU - Zhang, X.

AU - Kings, I.N.

AU - Lee, A.F.

AU - Simmons, M.J.H.

AU - Wilson, K.

AU - Jackson, S.D.

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Y1 - 2017/6/5

N2 - Hydrodeoxygenation of para-methylguaiacol using silica supported Rh or Pt catalysts was investigated using a fixed-bed reactor at 300 °C, under 4 barg hydrogen and a WHSV of 2.5 h−1. The activity, selectivity and deactivation of the catalysts were examined in relation to time on stream. Three catalysts were tested: 2.5% Rh/silica supplied by Johnson Matthey (JM), 2.5% Rh/silica and 1.55% Pt/silica both prepared in-house. The Rh/silica (JM) showed the best stability with steady-state reached after 6 h on stream and a constant activity over 3 days of reaction. In contrast the other two catalysts did not reach steady state within the timeframe of the tests, with continuous deactivation over the time on stream. Nevertheless higher coking was observed on the Rh/silica (JM) catalyst, while all three catalysts showed evidence of sintering. The Pt catalyst (A) showed higher selectivity for the production of 4-methylcatechol while the Rh catalysts were more selective toward the cresols. In all cases, complete hydrodeoxygenation of the methylguaiacol to methylcyclohexane was not observed.

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