Effect of iridium loading on HZSM-5 for isomerization of n-heptane

Herma Dina Setiabudi, Sugeng Triwahyono, Aishah Abdul Jalil, Kamarudin Nur Hidayatul Nazirah, Muhammad Arif Ab Aziz

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8 Citations (Scopus)

Abstract

The effect of iridium loading on the properties and catalytic isomerization of n-heptane over Ir-HZSM-5 is studied. Ir-HZSM-5 was prepared by impregnation method and subjected to isomerization process in the presence of flowing hydrogen gas. XRD and BET studies show that the presence of iridium stabilizes the crystalline structure of HZSM-5, leading to more ordered framework structure and larger surface area. TGA and FTIR results substantiate that iridium species interacts with OH group on the surface of HZSM-5. Pyridine FT-IR study verifies the interaction between iridium and surface OH group slightly increased the Brönsted and Lewis acid sites without changing the lattice structure of HZSM-5. The presence of iridium and the increase of strong Lewis acid sites on HZSM-5 were found to bring an increase about 4.1, 33.2 and 11.8 in conversion, selectivity and yield of n-heptane isomerization, respectively.

Original languageEnglish
Pages (from-to)477-482
Number of pages6
JournalJournal of Natural Gas Chemistry
Volume20
Issue number5
DOIs
Publication statusPublished - Sep 2011
Externally publishedYes

Fingerprint

Iridium
Heptane
Isomerization
Lewis Acids
Acids
Impregnation
Pyridine
Hydrogen
Gases
n-heptane
Crystalline materials

Keywords

  • Ir-HZSM-5
  • Lewis acid sites
  • n-heptane isomerization
  • protonic acid sites

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Organic Chemistry
  • Chemical Engineering(all)

Cite this

Effect of iridium loading on HZSM-5 for isomerization of n-heptane. / Setiabudi, Herma Dina; Triwahyono, Sugeng; Jalil, Aishah Abdul; Nur Hidayatul Nazirah, Kamarudin; Aziz, Muhammad Arif Ab.

In: Journal of Natural Gas Chemistry, Vol. 20, No. 5, 09.2011, p. 477-482.

Research output: Contribution to journalArticle

Setiabudi, Herma Dina ; Triwahyono, Sugeng ; Jalil, Aishah Abdul ; Nur Hidayatul Nazirah, Kamarudin ; Aziz, Muhammad Arif Ab. / Effect of iridium loading on HZSM-5 for isomerization of n-heptane. In: Journal of Natural Gas Chemistry. 2011 ; Vol. 20, No. 5. pp. 477-482.
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AB - The effect of iridium loading on the properties and catalytic isomerization of n-heptane over Ir-HZSM-5 is studied. Ir-HZSM-5 was prepared by impregnation method and subjected to isomerization process in the presence of flowing hydrogen gas. XRD and BET studies show that the presence of iridium stabilizes the crystalline structure of HZSM-5, leading to more ordered framework structure and larger surface area. TGA and FTIR results substantiate that iridium species interacts with OH group on the surface of HZSM-5. Pyridine FT-IR study verifies the interaction between iridium and surface OH group slightly increased the Brönsted and Lewis acid sites without changing the lattice structure of HZSM-5. The presence of iridium and the increase of strong Lewis acid sites on HZSM-5 were found to bring an increase about 4.1, 33.2 and 11.8 in conversion, selectivity and yield of n-heptane isomerization, respectively.

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