Dehydrogenation of n-dodecane over Pt-Sn/Mg-Al-O catalysts: Investigating the catalyst performance while monitoring the products

Y. Lai, Songbo He, X. Li, C. Sun, Kulathuiyer Seshan

Research output: Contribution to journalArticleAcademicpeer-review

15 Citations (Scopus)

Abstract

n-Dodecane was dehydrogenated over PtSn/MgAlO catalysts. Al2O3 and MgAlO supports with different Mg/Al mole ratio were prepared using a chemical co-precipitation method. The supports and supported PtSn catalysts were characterized using BET, XRD, CO-chemisorption, NH3-TPD, and TG. The dehydrogenation products were analyzed by GC. A single photon ionization time-of-flight mass spectrometer (SPI-TOF-MS) was developed and used to monitor the dehydrogenation products on-line during continuous reactions. Adding Mg to the supports decreased the specific surface area, increased the pore volume and diameter, moderated the acidity, and changed the strong acidic sites to weak ones. The dehydrogenation activity of the catalysts was inhibited, while the mono-olefin selectivity and yield were enhanced by Mg addition. Using a 1/3 Mg/Al molar ratio generated the optimal n-dodecene yield over the PtSn/MgAlO catalysts. The TOF-MS was reliable for detecting the dehydrogenation products of the long-chain paraffins rapidly, continuously, and accurately. Interestingly, TOF-MS can be used to monitor the reactions on-line and in situ, providing analyses of the products during high temperature reactions.
Original languageEnglish
Pages (from-to)74-80
JournalApplied catalysis A: general
Volume469
DOIs
Publication statusPublished - 2014

Fingerprint

Dehydrogenation
Catalyst supports
Catalysts
Monitoring
Catalyst selectivity
Alkenes
Mass spectrometers
Carbon Monoxide
Temperature programmed desorption
Chemisorption
Coprecipitation
Acidity
Specific surface area
Paraffin
Paraffins
Olefins
Ionization
Photons
n-dodecane
Temperature

Keywords

  • METIS-298519
  • IR-87663

Cite this

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title = "Dehydrogenation of n-dodecane over Pt-Sn/Mg-Al-O catalysts: Investigating the catalyst performance while monitoring the products",
abstract = "n-Dodecane was dehydrogenated over PtSn/MgAlO catalysts. Al2O3 and MgAlO supports with different Mg/Al mole ratio were prepared using a chemical co-precipitation method. The supports and supported PtSn catalysts were characterized using BET, XRD, CO-chemisorption, NH3-TPD, and TG. The dehydrogenation products were analyzed by GC. A single photon ionization time-of-flight mass spectrometer (SPI-TOF-MS) was developed and used to monitor the dehydrogenation products on-line during continuous reactions. Adding Mg to the supports decreased the specific surface area, increased the pore volume and diameter, moderated the acidity, and changed the strong acidic sites to weak ones. The dehydrogenation activity of the catalysts was inhibited, while the mono-olefin selectivity and yield were enhanced by Mg addition. Using a 1/3 Mg/Al molar ratio generated the optimal n-dodecene yield over the PtSn/MgAlO catalysts. The TOF-MS was reliable for detecting the dehydrogenation products of the long-chain paraffins rapidly, continuously, and accurately. Interestingly, TOF-MS can be used to monitor the reactions on-line and in situ, providing analyses of the products during high temperature reactions.",
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Dehydrogenation of n-dodecane over Pt-Sn/Mg-Al-O catalysts: Investigating the catalyst performance while monitoring the products. / Lai, Y.; He, Songbo; Li, X.; Sun, C.; Seshan, Kulathuiyer.

In: Applied catalysis A: general, Vol. 469, 2014, p. 74-80.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Dehydrogenation of n-dodecane over Pt-Sn/Mg-Al-O catalysts: Investigating the catalyst performance while monitoring the products

AU - Lai, Y.

AU - He, Songbo

AU - Li, X.

AU - Sun, C.

AU - Seshan, Kulathuiyer

PY - 2014

Y1 - 2014

N2 - n-Dodecane was dehydrogenated over PtSn/MgAlO catalysts. Al2O3 and MgAlO supports with different Mg/Al mole ratio were prepared using a chemical co-precipitation method. The supports and supported PtSn catalysts were characterized using BET, XRD, CO-chemisorption, NH3-TPD, and TG. The dehydrogenation products were analyzed by GC. A single photon ionization time-of-flight mass spectrometer (SPI-TOF-MS) was developed and used to monitor the dehydrogenation products on-line during continuous reactions. Adding Mg to the supports decreased the specific surface area, increased the pore volume and diameter, moderated the acidity, and changed the strong acidic sites to weak ones. The dehydrogenation activity of the catalysts was inhibited, while the mono-olefin selectivity and yield were enhanced by Mg addition. Using a 1/3 Mg/Al molar ratio generated the optimal n-dodecene yield over the PtSn/MgAlO catalysts. The TOF-MS was reliable for detecting the dehydrogenation products of the long-chain paraffins rapidly, continuously, and accurately. Interestingly, TOF-MS can be used to monitor the reactions on-line and in situ, providing analyses of the products during high temperature reactions.

AB - n-Dodecane was dehydrogenated over PtSn/MgAlO catalysts. Al2O3 and MgAlO supports with different Mg/Al mole ratio were prepared using a chemical co-precipitation method. The supports and supported PtSn catalysts were characterized using BET, XRD, CO-chemisorption, NH3-TPD, and TG. The dehydrogenation products were analyzed by GC. A single photon ionization time-of-flight mass spectrometer (SPI-TOF-MS) was developed and used to monitor the dehydrogenation products on-line during continuous reactions. Adding Mg to the supports decreased the specific surface area, increased the pore volume and diameter, moderated the acidity, and changed the strong acidic sites to weak ones. The dehydrogenation activity of the catalysts was inhibited, while the mono-olefin selectivity and yield were enhanced by Mg addition. Using a 1/3 Mg/Al molar ratio generated the optimal n-dodecene yield over the PtSn/MgAlO catalysts. The TOF-MS was reliable for detecting the dehydrogenation products of the long-chain paraffins rapidly, continuously, and accurately. Interestingly, TOF-MS can be used to monitor the reactions on-line and in situ, providing analyses of the products during high temperature reactions.

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DO - 10.1016/j.apcata.2013.09.042

M3 - Article

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JO - Applied catalysis A: general

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