Negative effect of Ni on PtHY in n-pentane isomerization evidenced by IR and ESR studies

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

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Ni/PtHY with different Ni loadings was prepared by impregnating HY with hexachloroplatinic acid solution and Ni 2+/N, N-dimethylformamide solution. An increase in the Ni loading decreased the crystallinity, specific surface area and meso-micropores of the catalysts. Ni interacted with hydroxyl groups to produce IR absorption bands at 3740-3500 cm -1. Increasing Ni loadings resulted in a decrease in the intensities of the broad bands at 3730-3500 cm -1 and the sharp band at 3740 cm -1 with simultaneous development of new absorbance band at 3700 cm -1 that was attributed to (-OH)Ni. The acidity of the samples did not significantly change with Ni loadings up to 1.0 wt%, which indicated that Ni mostly interacts with non-acidic silanol groups (terminal- and structural-defect OH groups). The presence of Ni decreased the activity of PtHY toward the isomerization of n-pentane because of a decrease in the number of active protonic-acid sites that formed from molecular hydrogen. IR and ESR studies confirmed that Pt facilitated the formation of protonic-acid sites from molecular hydrogen, whereas Ni, even when combined with Pt, didn't exhibit such ability. The absence of protonic-acid sites from molecular hydrogen significantly decreased the yield of iso-pentane and markedly increased the cracking products.

Original languageEnglish
Pages (from-to)29-36
Number of pages8
JournalJournal of Natural Gas Chemistry
Volume21
Issue number1
DOIs
Publication statusPublished - Jan 2012
Externally publishedYes

Fingerprint

Isomerization
Paramagnetic resonance
Hydrogen
Acids
Dimethylformamide
Acidity
Specific surface area
Hydroxyl Radical
Absorption spectra
Defects
Catalysts
pentane

Keywords

  • Hydrogen
  • n-pentane isomerization
  • Ni
  • Ni/PtHY
  • Protonic acid sites

ASJC Scopus subject areas

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

Cite this

Negative effect of Ni on PtHY in n-pentane isomerization evidenced by IR and ESR studies. / Aziz, Muhammad Arif Ab; Nur Hidayatul Nazirah, Kamarudin; Setiabudi, Herma Dina; Hamdan, Halimaton; Jalil, Aishah Abdul; Triwahyono, Sugeng.

In: Journal of Natural Gas Chemistry, Vol. 21, No. 1, 01.2012, p. 29-36.

Research output: Contribution to journalArticle

Aziz, Muhammad Arif Ab ; Nur Hidayatul Nazirah, Kamarudin ; Setiabudi, Herma Dina ; Hamdan, Halimaton ; Jalil, Aishah Abdul ; Triwahyono, Sugeng. / Negative effect of Ni on PtHY in n-pentane isomerization evidenced by IR and ESR studies. In: Journal of Natural Gas Chemistry. 2012 ; Vol. 21, No. 1. pp. 29-36.
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AB - Ni/PtHY with different Ni loadings was prepared by impregnating HY with hexachloroplatinic acid solution and Ni 2+/N, N-dimethylformamide solution. An increase in the Ni loading decreased the crystallinity, specific surface area and meso-micropores of the catalysts. Ni interacted with hydroxyl groups to produce IR absorption bands at 3740-3500 cm -1. Increasing Ni loadings resulted in a decrease in the intensities of the broad bands at 3730-3500 cm -1 and the sharp band at 3740 cm -1 with simultaneous development of new absorbance band at 3700 cm -1 that was attributed to (-OH)Ni. The acidity of the samples did not significantly change with Ni loadings up to 1.0 wt%, which indicated that Ni mostly interacts with non-acidic silanol groups (terminal- and structural-defect OH groups). The presence of Ni decreased the activity of PtHY toward the isomerization of n-pentane because of a decrease in the number of active protonic-acid sites that formed from molecular hydrogen. IR and ESR studies confirmed that Pt facilitated the formation of protonic-acid sites from molecular hydrogen, whereas Ni, even when combined with Pt, didn't exhibit such ability. The absence of protonic-acid sites from molecular hydrogen significantly decreased the yield of iso-pentane and markedly increased the cracking products.

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