IR study of iridium bonded to perturbed silanol groups of Pt-HZSM5 for n-pentane isomerization

Herma Dina Setiabudi, Aishah Abdul Jalil, Sugeng Triwahyono, Kamarudin Nur Hidayatul Nazirah, Rino R. Mukti

Research output: Contribution to journalArticle

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Abstract

The Ir/Pt-HZSM5 catalyst was prepared by impregnation of iridium on Pt-HZSM5. The activity of Ir/Pt-HZSM5 was tested for n-pentane isomerization under hydrogen stream. The introduction of iridium did not change the bands observed at 3740, 3665 and 3610 cm -1 indicating that neither non-acidic terminal silanol groups nor acidic bridging hydroxyl groups interacted with the iridium. Additionally, the peaks corresponding to the perturbed silanol groups at 3700 and 3520 cm -1 decreased significantly. X-ray photoelectron spectroscopy (XPS) analysis revealed that the iridium is in the form of IrO 2. 27Al MAS NMR confirmed the elimination of distorted tetrahedral aluminum. The presence of iridium slightly increased the acidity of Pt-HZSM5 and its selectivity for iso-pentane. Hydrogen adsorption FTIR indicated that iridium enhanced the formation of protonic acid sites which may participate in the isomerization, and inhibited the formation of hydroxyl groups at 3380, 3600 and 3680 cm -1 which may participate in the enhancement of the cracking reaction.

Original languageEnglish
Pages (from-to)190-199
Number of pages10
JournalApplied Catalysis A: General
Volume417-418
DOIs
Publication statusPublished - 29 Feb 2012
Externally publishedYes

Fingerprint

Iridium
Isomerization
Hydroxyl Radical
Hydrogen
Aluminum
Acidity
Impregnation
silanol
pentane
X ray photoelectron spectroscopy
Nuclear magnetic resonance
Adsorption
Catalysts
Acids

Keywords

  • Ir/Pt-HZSM5
  • IrO
  • n-Pentane isomerization
  • Perturbed silanol groups
  • Protonic acid sites

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

Cite this

IR study of iridium bonded to perturbed silanol groups of Pt-HZSM5 for n-pentane isomerization. / Setiabudi, Herma Dina; Jalil, Aishah Abdul; Triwahyono, Sugeng; Nur Hidayatul Nazirah, Kamarudin; Mukti, Rino R.

In: Applied Catalysis A: General, Vol. 417-418, 29.02.2012, p. 190-199.

Research output: Contribution to journalArticle

Setiabudi, Herma Dina ; Jalil, Aishah Abdul ; Triwahyono, Sugeng ; Nur Hidayatul Nazirah, Kamarudin ; Mukti, Rino R. / IR study of iridium bonded to perturbed silanol groups of Pt-HZSM5 for n-pentane isomerization. In: Applied Catalysis A: General. 2012 ; Vol. 417-418. pp. 190-199.
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AU - Nur Hidayatul Nazirah, Kamarudin

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AB - The Ir/Pt-HZSM5 catalyst was prepared by impregnation of iridium on Pt-HZSM5. The activity of Ir/Pt-HZSM5 was tested for n-pentane isomerization under hydrogen stream. The introduction of iridium did not change the bands observed at 3740, 3665 and 3610 cm -1 indicating that neither non-acidic terminal silanol groups nor acidic bridging hydroxyl groups interacted with the iridium. Additionally, the peaks corresponding to the perturbed silanol groups at 3700 and 3520 cm -1 decreased significantly. X-ray photoelectron spectroscopy (XPS) analysis revealed that the iridium is in the form of IrO 2. 27Al MAS NMR confirmed the elimination of distorted tetrahedral aluminum. The presence of iridium slightly increased the acidity of Pt-HZSM5 and its selectivity for iso-pentane. Hydrogen adsorption FTIR indicated that iridium enhanced the formation of protonic acid sites which may participate in the isomerization, and inhibited the formation of hydroxyl groups at 3380, 3600 and 3680 cm -1 which may participate in the enhancement of the cracking reaction.

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