Characterization and performance of a [PtMo6]/MgO catalyst for alkane- to-alkene conversion

D. I. Kondarides; K. Tomishige; Y. Nagasawa; U. Lee; Y. Iwasawa

doi:10.1016/1381-1169(96)00117-3

Characterization and performance of a [PtMo₆]/MgO catalyst for alkane- to-alkene conversion

D. I. Kondarides, K. Tomishige, Y. Nagasawa, U. Lee, Y. Iwasawa

Research output: Contribution to journal › Article › peer-review

20 Citations (Scopus)

Abstract

A novel [PtMo₆]/MgO ensemble catalyst was prepared by using an inorganic cluster [PtMo₆O₂₄]^8- as precursor and characterized by X-ray absorption fine structure (XAFS) spectroscopy. The EXAFS analysis revealed that platinum and molybdenum atoms interact with MgO support after calcination at temperatures above 673 K, making Pt-O, Pt-Mg and Pt-O (long) bonds, and Mo-O and Mo-Mg bonds, respectively. It was suggested that Pt⁴⁺ ions replaced Mg²⁺ ions of the top layer of the MgO surface, while Mo⁶⁺ ions located on the surface in a distorted octahedral symmetry. The dehydrogenation activity of the [PtMo⁶]/MgO catalyst for the dehydrogenation reactions of butane, isobutane and propane was much higher compared to those of conventionally prepared bimetallic (Pt-Mo/MgO) and monometallic (Pt/MgO and Mo/MgO) catalysts. The selectivity to the corresponding alkenes was typically above 97%. The [PtMo₆]/MgO ensemble catalyst was found to be resistant to deactivation due to coke formation.

Original language	English
Pages (from-to)	145-165
Number of pages	21
Journal	Journal of Molecular Catalysis A: Chemical
Volume	111
Issue number	1-2
DOIs	https://doi.org/10.1016/1381-1169(96)00117-3
Publication status	Published - 1996 Sept 10
Externally published	Yes

Keywords

Alkanes
Characterization
Dehydrogenation
Magnesium
Molybdenum
Platinum

ASJC Scopus subject areas

Catalysis
Process Chemistry and Technology
Physical and Theoretical Chemistry

Access to Document

10.1016/1381-1169(96)00117-3

Cite this

@article{96b3391ec03d4f708f0e15fb03d0d046,

title = "Characterization and performance of a [PtMo6]/MgO catalyst for alkane- to-alkene conversion",

abstract = "A novel [PtMo6]/MgO ensemble catalyst was prepared by using an inorganic cluster [PtMo6O24]8- as precursor and characterized by X-ray absorption fine structure (XAFS) spectroscopy. The EXAFS analysis revealed that platinum and molybdenum atoms interact with MgO support after calcination at temperatures above 673 K, making Pt-O, Pt-Mg and Pt-O (long) bonds, and Mo-O and Mo-Mg bonds, respectively. It was suggested that Pt4+ ions replaced Mg2+ ions of the top layer of the MgO surface, while Mo6+ ions located on the surface in a distorted octahedral symmetry. The dehydrogenation activity of the [PtMo6]/MgO catalyst for the dehydrogenation reactions of butane, isobutane and propane was much higher compared to those of conventionally prepared bimetallic (Pt-Mo/MgO) and monometallic (Pt/MgO and Mo/MgO) catalysts. The selectivity to the corresponding alkenes was typically above 97%. The [PtMo6]/MgO ensemble catalyst was found to be resistant to deactivation due to coke formation.",

keywords = "Alkanes, Characterization, Dehydrogenation, Magnesium, Molybdenum, Platinum",

author = "Kondarides, {D. I.} and K. Tomishige and Y. Nagasawa and U. Lee and Y. Iwasawa",

year = "1996",

month = sep,

day = "10",

doi = "10.1016/1381-1169(96)00117-3",

language = "English",

volume = "111",

pages = "145--165",

journal = "Journal of Molecular Catalysis A: Chemical",

issn = "1381-1169",

publisher = "Elsevier",

number = "1-2",

}

TY - JOUR

T1 - Characterization and performance of a [PtMo6]/MgO catalyst for alkane- to-alkene conversion

AU - Kondarides, D. I.

AU - Tomishige, K.

AU - Nagasawa, Y.

AU - Lee, U.

AU - Iwasawa, Y.

PY - 1996/9/10

Y1 - 1996/9/10

N2 - A novel [PtMo6]/MgO ensemble catalyst was prepared by using an inorganic cluster [PtMo6O24]8- as precursor and characterized by X-ray absorption fine structure (XAFS) spectroscopy. The EXAFS analysis revealed that platinum and molybdenum atoms interact with MgO support after calcination at temperatures above 673 K, making Pt-O, Pt-Mg and Pt-O (long) bonds, and Mo-O and Mo-Mg bonds, respectively. It was suggested that Pt4+ ions replaced Mg2+ ions of the top layer of the MgO surface, while Mo6+ ions located on the surface in a distorted octahedral symmetry. The dehydrogenation activity of the [PtMo6]/MgO catalyst for the dehydrogenation reactions of butane, isobutane and propane was much higher compared to those of conventionally prepared bimetallic (Pt-Mo/MgO) and monometallic (Pt/MgO and Mo/MgO) catalysts. The selectivity to the corresponding alkenes was typically above 97%. The [PtMo6]/MgO ensemble catalyst was found to be resistant to deactivation due to coke formation.

AB - A novel [PtMo6]/MgO ensemble catalyst was prepared by using an inorganic cluster [PtMo6O24]8- as precursor and characterized by X-ray absorption fine structure (XAFS) spectroscopy. The EXAFS analysis revealed that platinum and molybdenum atoms interact with MgO support after calcination at temperatures above 673 K, making Pt-O, Pt-Mg and Pt-O (long) bonds, and Mo-O and Mo-Mg bonds, respectively. It was suggested that Pt4+ ions replaced Mg2+ ions of the top layer of the MgO surface, while Mo6+ ions located on the surface in a distorted octahedral symmetry. The dehydrogenation activity of the [PtMo6]/MgO catalyst for the dehydrogenation reactions of butane, isobutane and propane was much higher compared to those of conventionally prepared bimetallic (Pt-Mo/MgO) and monometallic (Pt/MgO and Mo/MgO) catalysts. The selectivity to the corresponding alkenes was typically above 97%. The [PtMo6]/MgO ensemble catalyst was found to be resistant to deactivation due to coke formation.

KW - Alkanes

KW - Characterization

KW - Dehydrogenation

KW - Magnesium

KW - Molybdenum

KW - Platinum

UR - http://www.scopus.com/inward/record.url?scp=0030578909&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0030578909&partnerID=8YFLogxK

U2 - 10.1016/1381-1169(96)00117-3

DO - 10.1016/1381-1169(96)00117-3

M3 - Article

AN - SCOPUS:0030578909

SN - 1381-1169

VL - 111

SP - 145

EP - 165

JO - Journal of Molecular Catalysis A: Chemical

JF - Journal of Molecular Catalysis A: Chemical

IS - 1-2

ER -