Dehydrogenation of i-butane on CrOx/Al2O3 catalysts prepared by ALE and impregnation techniques

Hakuli, A.; Kytökivi, Arla; Krause, A.O.I.

doi:10.1016/s0926-860x(99)00310-5

Cited by 101 publications

(113 citation statements)

References 57 publications

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“…More specifically, it has been shown by the group of Schlogl that carbon nanomaterials are very active catalyst materials in the oxidative dehydrogenation of ethylbenzene to styrene [14,15]. This observation is further supported by our own findings that with a Cr/ Al 2 O 3 catalyst, a maximum in propene yield during a propane dehydrogenation cycle is achieved after about 20 min-on-stream [16][17][18]. This observation could be explained by initial formation of carbon deposits by the supported chromium oxide species.…”

Section: Introductionsupporting

confidence: 81%

“…This corresponds to a Cr dispersion of 14%, assuming that the crystallites are composed of Cr 2 O 3 . Formation of a Cr-O monolayer on the alumina surface, as proposed by Hakuli et al [16] would further increase the dispersion. EDS analysis could not confirm whether such a layer is present on our catalyst sample.…”

Section: Ethane Feed)mentioning

confidence: 81%

“…The alumina-supported chromium oxide catalyst (13 wt% Cr/Al 2 O 3 , 200 mg, 0.25-0.42 mm particle size) was pretreated by heating to 580°C in He stream and exposure to 20% O 2 /He for 30 min at 580°C before flushing with He. Details of the catalyst system can be found elsewhere [16][17][18]. Unless otherwise specified, the reaction mixture was composed of 2 Nml/ min C 2 H 6 and 20 Nml/min He.…”

Section: Methodsmentioning

confidence: 99%

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Mechanistic Insight in the Ethane Dehydrogenation Reaction over Cr/Al2O3 Catalysts

et al. 2005

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A Cr/Al 2 O 3 alkane dehydrogenation catalyst exhibits a maximum in ethylene yield during an ethane dehydrogenation cycle. Isotopic labelling experiments with monolabelled 13 C-ethane and deuterium were used to elucidate whether the initial activity increase could be due to formation of an active, larger hydrocarbon intermediate on the surface. The results strongly indicate that this is not the case, and instead point to a traditional reaction cycle involving adsorption of ethane to form an ethyl species, followed by desorption of ethene and hydrogen. Transient kinetic data suggest that ethane adsorption is the rate-determining step of reaction.

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Section: Introductionsupporting

confidence: 81%

Section: Ethane Feed)mentioning

confidence: 81%

Section: Methodsmentioning

confidence: 99%

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Mechanistic Insight in the Ethane Dehydrogenation Reaction over Cr/Al2O3 Catalysts

et al. 2005

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“…Especially, Cr and Ga catalysts have been reported because of their low-cost and high-performance. Regarding Cr catalyst, Hakuli et al reported that 14-16 wt% CrOx/Al2O3 showed high selectivity on dehydrogenation of isobutane and longer catalyst life 12) . Shi et al reported that 5 wt% Cr _ 10 wt% Ce/SBA-15 catalysts are effective for oxidative dehydrogenation of ethane and exhibited high conversion and ethylene selectivity 13) .…”

Section: Hmentioning

confidence: 99%

Supported Ga-oxide Catalyst for Dehydrogenation of Ethane

Saito

Maeda

Seki

et al. 2017

J. Jpn. Petrol. Inst.

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We studied dehydrogenation catalysts to improve the performance of the ethane cracking tube. Ga, Ge, In, and Sn were studied as dehydrogenation catalysts. Catalytic activity tests showed that the Ga catalyst has the best performance among them. Although the Ga catalyst supported on α-Al2O3 calcined at 1323 K deactivated with time on stream, the Ga catalyst supported on γ-Al2O3 calcined at 1323 K showed high ethylene yield and stability. Analyses of BET, XRD, EDX, and XANES were conducted to elucidate the differences of their performances. Ga catalyst supported on γ-Al2O3 calcined at 1323 K showed high catalytic activity and stability because Ga was supported as a highly dispersed β-Ga2O3-like structure thanks to high specific surface area of the γ-Al2O3 support.

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“…Oxidized chromia/alumina catalysts contain chromium in oxidation states Cr 6+ , Cr 5+ , and Cr 3+ (5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23). Cr 6+ and Cr 5+ are reduced by alkanes, hydrogen, and carbon monoxide under typical dehydrogenation conditions (500-600…”

Section: Introductionmentioning

confidence: 99%

Semi-Conductor Industry

Monsalvo¹

2015

Ecological Technologies for Industrial Wastewater Management

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Irreversible deactivation of chromia/alumina dehydrogenation catalysts was investigated by deactivating the catalysts (4 wt% Cr) through prolonged calcination in air at temperatures up to 1200• C. Nitrogen physisorption, X-ray diffraction, diffuse reflectance spectroscopy in the UV-visible region, X-ray photoelectron spectroscopy, electron spin resonance spectroscopy, and catalytic measurements revealed that two deactivation mechanisms were responsible for the formation of catalytically inactive aluminaincorporated Cr 3+ species: (i) entrapment of Cr 3+ ions inside the alumina support during sintering of the alumina support and (ii) migration of Cr 3+ ions into the alumina support. Chromia that had been impregnated on alumina inhibited the phase transformation from γ-to α-alumina.

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Dehydrogenation of i-butane on CrOx/Al2O3 catalysts prepared by ALE and impregnation techniques

Cited by 101 publications

References 57 publications

Mechanistic Insight in the Ethane Dehydrogenation Reaction over Cr/Al2O3 Catalysts

Mechanistic Insight in the Ethane Dehydrogenation Reaction over Cr/Al2O3 Catalysts

Supported Ga-oxide Catalyst for Dehydrogenation of Ethane

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