Effect of Cr2O3 loading on the properties and cracking activity of Pt/Cr2O3-ZrO2

N. H.R. Annuar, S. Triwahyono, A. A. Jalil, N. Basar, T. A.T. Abdullah, A. Ahmad

Research output: Research - peer-reviewArticle

Abstract

The effects of Cr2O3 loading ranging from 1 to 12 wt.% on the properties, structure and isopropylbenzene (IPB), 1,4-diisopropylbenzene (DIPB) and 1,3,5-triisopropylbenzene (TIPB) hydrocracking activities of Pt/Cr2O3-ZrO2 (Pt/CrZr) were studied. The properties of Pt/CrZr were characterized with XRD, BET, IR and UV–vis spectrometer. The acidity was determined by 2,6-lutidine adsorbed IR spectroscopy. The introduction of Cr2O3 on ZrO2 intensified continuously the tetragonal phase of ZrO2 and bulk crystalline Cr2O3, while the surface area and acidity passed through a maximum of Cr2O3 loading at 8 wt.%. The IR study confirmed the presence of Cr[dbnd]O stretching bands at 1035 and 1013 cm−1 on Pt/CrZr. No dioxo species involving the stretching modes of O[dbnd]Cr[dbnd]O existed. H2 and 2,6-lutidine showed different interactions with Pt/CrZr in which the band at 1013 cm−1 is more extensively affected with 2,6-lutidine adsorption for all Pt/CrZr and the band at 1035 cm−1 is more affected with H2 adsorption for Cr2O3 loading at ≤ 8 wt.%. While, at > 8 wt.% Cr2O3 loading, the H2 is more interacted with the band at 1013 cm−1. These results suggested that the absorbance bands at 1013 and 1035 cm−1 are assignable to the stretching of the Cr[dbnd]O which is connected to the other Cr through O and Cr[dbnd]O which is connected to cus Zr4+ through O, respectively. The catalyst with 8 wt.% loading performed with a maximum activity in IPB, DIPB and TIPB hydrocracking at 523 K which may be due to presence of Cr[dbnd]O band at 1035 cm−1 which extensively interacted with H2 to form protonic acid sites via a hydrogen spillover phenomenon. In fact, Cr2O3 loading at 8 wt.% possessed strong permanent Lewis acid sites which play an important role in the stabilization of an electron during the formation of protonic acid sites.

LanguageEnglish
Pages77-86
Number of pages10
JournalApplied Catalysis A: General
Volume541
DOIs
StatePublished - 5 Jul 2017

Fingerprint

Stretching
2,6-lutidine
Acids
diisopropylbenzene
Hydrocracking
Acidity
Adsorption
cumene
Ultraviolet spectrometers
Lewis Acids
Hydrogen
Infrared spectroscopy
Stabilization
Crystalline materials
Catalysts
Electrons

Keywords

  • Cr[dbnd]O stretching band
  • Hydrocracking
  • Lewis acid site
  • Protonic acid site
  • Pt/CrO-ZrO

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

Cite this

Effect of Cr2O3 loading on the properties and cracking activity of Pt/Cr2O3-ZrO2 . / Annuar, N. H.R.; Triwahyono, S.; Jalil, A. A.; Basar, N.; Abdullah, T. A.T.; Ahmad, A.

In: Applied Catalysis A: General, Vol. 541, 05.07.2017, p. 77-86.

Research output: Research - peer-reviewArticle

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title = "Effect of Cr2O3 loading on the properties and cracking activity of Pt/Cr2O3-ZrO2",
abstract = "The effects of Cr2O3 loading ranging from 1 to 12 wt.% on the properties, structure and isopropylbenzene (IPB), 1,4-diisopropylbenzene (DIPB) and 1,3,5-triisopropylbenzene (TIPB) hydrocracking activities of Pt/Cr2O3-ZrO2 (Pt/CrZr) were studied. The properties of Pt/CrZr were characterized with XRD, BET, IR and UV–vis spectrometer. The acidity was determined by 2,6-lutidine adsorbed IR spectroscopy. The introduction of Cr2O3 on ZrO2 intensified continuously the tetragonal phase of ZrO2 and bulk crystalline Cr2O3, while the surface area and acidity passed through a maximum of Cr2O3 loading at 8 wt.%. The IR study confirmed the presence of Cr[dbnd]O stretching bands at 1035 and 1013 cm−1 on Pt/CrZr. No dioxo species involving the stretching modes of O[dbnd]Cr[dbnd]O existed. H2 and 2,6-lutidine showed different interactions with Pt/CrZr in which the band at 1013 cm−1 is more extensively affected with 2,6-lutidine adsorption for all Pt/CrZr and the band at 1035 cm−1 is more affected with H2 adsorption for Cr2O3 loading at ≤ 8 wt.%. While, at > 8 wt.% Cr2O3 loading, the H2 is more interacted with the band at 1013 cm−1. These results suggested that the absorbance bands at 1013 and 1035 cm−1 are assignable to the stretching of the Cr[dbnd]O which is connected to the other Cr through O and Cr[dbnd]O which is connected to cus Zr4+ through O, respectively. The catalyst with 8 wt.% loading performed with a maximum activity in IPB, DIPB and TIPB hydrocracking at 523 K which may be due to presence of Cr[dbnd]O band at 1035 cm−1 which extensively interacted with H2 to form protonic acid sites via a hydrogen spillover phenomenon. In fact, Cr2O3 loading at 8 wt.% possessed strong permanent Lewis acid sites which play an important role in the stabilization of an electron during the formation of protonic acid sites.",
keywords = "Cr[dbnd]O stretching band, Hydrocracking, Lewis acid site, Protonic acid site, Pt/CrO-ZrO",
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AU - Annuar,N. H.R.

AU - Triwahyono,S.

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AU - Basar,N.

AU - Abdullah,T. A.T.

AU - Ahmad,A.

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N2 - The effects of Cr2O3 loading ranging from 1 to 12 wt.% on the properties, structure and isopropylbenzene (IPB), 1,4-diisopropylbenzene (DIPB) and 1,3,5-triisopropylbenzene (TIPB) hydrocracking activities of Pt/Cr2O3-ZrO2 (Pt/CrZr) were studied. The properties of Pt/CrZr were characterized with XRD, BET, IR and UV–vis spectrometer. The acidity was determined by 2,6-lutidine adsorbed IR spectroscopy. The introduction of Cr2O3 on ZrO2 intensified continuously the tetragonal phase of ZrO2 and bulk crystalline Cr2O3, while the surface area and acidity passed through a maximum of Cr2O3 loading at 8 wt.%. The IR study confirmed the presence of Cr[dbnd]O stretching bands at 1035 and 1013 cm−1 on Pt/CrZr. No dioxo species involving the stretching modes of O[dbnd]Cr[dbnd]O existed. H2 and 2,6-lutidine showed different interactions with Pt/CrZr in which the band at 1013 cm−1 is more extensively affected with 2,6-lutidine adsorption for all Pt/CrZr and the band at 1035 cm−1 is more affected with H2 adsorption for Cr2O3 loading at ≤ 8 wt.%. While, at > 8 wt.% Cr2O3 loading, the H2 is more interacted with the band at 1013 cm−1. These results suggested that the absorbance bands at 1013 and 1035 cm−1 are assignable to the stretching of the Cr[dbnd]O which is connected to the other Cr through O and Cr[dbnd]O which is connected to cus Zr4+ through O, respectively. The catalyst with 8 wt.% loading performed with a maximum activity in IPB, DIPB and TIPB hydrocracking at 523 K which may be due to presence of Cr[dbnd]O band at 1035 cm−1 which extensively interacted with H2 to form protonic acid sites via a hydrogen spillover phenomenon. In fact, Cr2O3 loading at 8 wt.% possessed strong permanent Lewis acid sites which play an important role in the stabilization of an electron during the formation of protonic acid sites.

AB - The effects of Cr2O3 loading ranging from 1 to 12 wt.% on the properties, structure and isopropylbenzene (IPB), 1,4-diisopropylbenzene (DIPB) and 1,3,5-triisopropylbenzene (TIPB) hydrocracking activities of Pt/Cr2O3-ZrO2 (Pt/CrZr) were studied. The properties of Pt/CrZr were characterized with XRD, BET, IR and UV–vis spectrometer. The acidity was determined by 2,6-lutidine adsorbed IR spectroscopy. The introduction of Cr2O3 on ZrO2 intensified continuously the tetragonal phase of ZrO2 and bulk crystalline Cr2O3, while the surface area and acidity passed through a maximum of Cr2O3 loading at 8 wt.%. The IR study confirmed the presence of Cr[dbnd]O stretching bands at 1035 and 1013 cm−1 on Pt/CrZr. No dioxo species involving the stretching modes of O[dbnd]Cr[dbnd]O existed. H2 and 2,6-lutidine showed different interactions with Pt/CrZr in which the band at 1013 cm−1 is more extensively affected with 2,6-lutidine adsorption for all Pt/CrZr and the band at 1035 cm−1 is more affected with H2 adsorption for Cr2O3 loading at ≤ 8 wt.%. While, at > 8 wt.% Cr2O3 loading, the H2 is more interacted with the band at 1013 cm−1. These results suggested that the absorbance bands at 1013 and 1035 cm−1 are assignable to the stretching of the Cr[dbnd]O which is connected to the other Cr through O and Cr[dbnd]O which is connected to cus Zr4+ through O, respectively. The catalyst with 8 wt.% loading performed with a maximum activity in IPB, DIPB and TIPB hydrocracking at 523 K which may be due to presence of Cr[dbnd]O band at 1035 cm−1 which extensively interacted with H2 to form protonic acid sites via a hydrogen spillover phenomenon. In fact, Cr2O3 loading at 8 wt.% possessed strong permanent Lewis acid sites which play an important role in the stabilization of an electron during the formation of protonic acid sites.

KW - Cr[dbnd]O stretching band

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KW - Protonic acid site

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