Ir/Pt-HZSM5 for n-pentane isomerization: Effect of Si/Al ratio and reaction optimization by response surface methodology

H. D. Setiabudi, A. A. Jalil, S. Triwahyono, Kamarudin Nur Hidayatul Nazirah, R. Jusoh

Research output: Contribution to journalArticle

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Abstract

The effects of Si/Al ratio on the properties of Ir/Pt-HZSM5 and n-pentane isomerization were studied. XRD results indicated that the increasing Si/Al ratio increased the percentage crystallinity of the catalysts, whereas, FTIR results showed that the increasing Si/Al ratio decreased the number of strong Brönsted and Lewis acid sites which led to decrease the catalytic activity towards n-pentane isomerization. Ir/Pt-HZSM5 with Si/Al ratio of 23 showed highest activity towards n-pentane isomerization, and the operating condition was further optimized by using response surface methodology (RSM). The RSM experiments were designed by using face-centered central composite design (FCCCD) by applying 24 factorial points, 8 axial points and 2 replicates, with three response variables (n-pentane conversion, isopentane selectivity and isopentane yield). The Pareto chart indicated that the reaction temperature have largest effect for all responses. The optimum condition of n-pentane isomerization over Ir/Pt-HZSM5 was at treatment temperature of 723K, treatment time of 6h, reaction temperature of 548K and F/W of 500mlg-1min-1 in which the predicted value for the n-pentane conversion, isopentane selectivity and isopentane yield was 63.0%, 98.2% and 61.9%, respectively.

Original languageEnglish
Pages (from-to)300-309
Number of pages10
JournalChemical Engineering Journal
Volume217
DOIs
Publication statusPublished - 1 Feb 2013
Externally publishedYes

Fingerprint

Isomerization
temperature
crystallinity
catalyst
X-ray diffraction
Temperature
Lewis Acids
Catalyst activity
acid
Catalysts
Acids
pentane
effect
response surface methodology
Composite materials
experiment
isopentane
Experiments

Keywords

  • Ir/Pt-HZSM5
  • N-Pentane isomerization
  • Response surface methodology (RSM)
  • Si/Al ratio
  • Strong acid sites

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Chemistry(all)
  • Industrial and Manufacturing Engineering
  • Environmental Chemistry

Cite this

Ir/Pt-HZSM5 for n-pentane isomerization : Effect of Si/Al ratio and reaction optimization by response surface methodology. / Setiabudi, H. D.; Jalil, A. A.; Triwahyono, S.; Nur Hidayatul Nazirah, Kamarudin; Jusoh, R.

In: Chemical Engineering Journal, Vol. 217, 01.02.2013, p. 300-309.

Research output: Contribution to journalArticle

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AB - The effects of Si/Al ratio on the properties of Ir/Pt-HZSM5 and n-pentane isomerization were studied. XRD results indicated that the increasing Si/Al ratio increased the percentage crystallinity of the catalysts, whereas, FTIR results showed that the increasing Si/Al ratio decreased the number of strong Brönsted and Lewis acid sites which led to decrease the catalytic activity towards n-pentane isomerization. Ir/Pt-HZSM5 with Si/Al ratio of 23 showed highest activity towards n-pentane isomerization, and the operating condition was further optimized by using response surface methodology (RSM). The RSM experiments were designed by using face-centered central composite design (FCCCD) by applying 24 factorial points, 8 axial points and 2 replicates, with three response variables (n-pentane conversion, isopentane selectivity and isopentane yield). The Pareto chart indicated that the reaction temperature have largest effect for all responses. The optimum condition of n-pentane isomerization over Ir/Pt-HZSM5 was at treatment temperature of 723K, treatment time of 6h, reaction temperature of 548K and F/W of 500mlg-1min-1 in which the predicted value for the n-pentane conversion, isopentane selectivity and isopentane yield was 63.0%, 98.2% and 61.9%, respectively.

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