Chromium Oxide/Alumina Catalysts in Oxidative Dehydrogenation of Isobutane

Grzybowska, B.; Słoczyński, J.; Grabowski, R.; Wcisło, K.; Kozłowska, Anna; Stoch, J.; Zieliński, Jerzy

doi:10.1006/jcat.1998.2203

Cited by 211 publications

(121 citation statements)

References 50 publications

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“…The former set of Cr2p signals can be assigned to Cr 3? ions, whereas those of the second set to Cr 6? ions. Thus, the peaks confirm the co-presence of Cr 3? and Cr 6? ions, as also reported in the literature [31,32]. The peaks assigned to Cr 6?…”

Section: O1s Xpssupporting

confidence: 84%

Oxidative dehydrogenation of ethane with carbon dioxide over Cr2O3/SBA-15 catalysts: the influence of sulfate modification of the support

et al. 2017

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Unmodified and sulfate-modified SBA-15-supported Cr 2 O 3 catalysts were prepared by impregnation method. The physico-chemical properties of the supports and catalysts were determined by nitrogen adsorption/ desorption, powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), laser-Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), UV-Vis diffuse reflectance spectroscopy (UV-DRS), inductively coupled plasma optical emission spectroscopy (ICP-OES), transmission electron microscopy (TEM) and temperature-programmed reduction (TPR) techniques. Oxidative dehydrogenation of ethane to ethylene (ODE) with CO 2 as oxidant was carried out on these catalysts in a fixed-bed reactor at temperatures in the range of 600-700°C and at atmospheric pressure. The changes in structural and textural properties because of sulfate modification were identified. Sulfate modification affected the nature of interaction of CrO x species with the SBA-15 support. During the evaluation, it was observed that sulfate modification enhances ethane conversion and ethylene selectivity of the catalyst. Better dispersion of CrO x and the increase in Cr 6? /Cr 3? ratio seem to be the reasons for the higher performance of the sulfate-modified catalysts compared to that of the unmodified catalyst.

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Section: O1s Xpssupporting

confidence: 84%

Oxidative dehydrogenation of ethane with carbon dioxide over Cr2O3/SBA-15 catalysts: the influence of sulfate modification of the support

et al. 2017

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“…3, all the PdCr catalysts show a peak with a maximum lower than 573 K. This peak is shifted toward higher temperatures as the Cr loading increases. For pure chromium oxides, the T max increases as the Cr loading decreases because of stronger bonding energy between Cr and oxygen (22). These results suggest catalytic reduction of CrOx by palladium.…”

Section: Temperature-programmed Reduction (Tpr)mentioning

confidence: 82%

“…The chromium trioxide on alumina can be reduced to chromium sesquioxide (Cr 2 O 3 ) at relatively low temperatures ca. 523 K, even without the help of Pd (22). Similarly, we can assume most of the chromium on the PdCr catalysts is chromium trioxide after calcination, and the CrO 3 species would first be reduced to chromium sesquioxide during reduction.…”

Section: Temperature-programmed Reduction (Tpr)mentioning

confidence: 98%

“…These results suggest catalytic reduction of CrOx by palladium. After carrying out calcination in a flow of air at 773 K for 5 h, Grzybowska et al (22) found that chromium is present on alumina in the form of hexavalent species, chromium trioxide, a fraction of which is strongly bound to the support surface. The chromium trioxide on alumina can be reduced to chromium sesquioxide (Cr 2 O 3 ) at relatively low temperatures ca.…”

Section: Temperature-programmed Reduction (Tpr)mentioning

confidence: 99%

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The Effect of Chromium on Sulfur Resistance of Pd/HY–Al2O3 Catalysts for Aromatic Hydrogenation

Xia

et al. 2001

Journal of Catalysis

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“…Chromia/alumina catalysts are industrially used for this process, and much recent research has been devoted to elucidating the structures of alumina-supported chromium oxide (5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23)(24). Despite these efforts, there is no consensus on the origin of the catalytic activity or on the deactivation mechanisms.…”

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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Chromium Oxide/Alumina Catalysts in Oxidative Dehydrogenation of Isobutane

Cited by 211 publications

References 50 publications

Oxidative dehydrogenation of ethane with carbon dioxide over Cr2O3/SBA-15 catalysts: the influence of sulfate modification of the support

Oxidative dehydrogenation of ethane with carbon dioxide over Cr2O3/SBA-15 catalysts: the influence of sulfate modification of the support

The Effect of Chromium on Sulfur Resistance of Pd/HY–Al2O3 Catalysts for Aromatic Hydrogenation

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