Structure and properties of the alumina-supported vanadia catalysts for ethylbenzene dehydrogenation in the presence of carbon dioxide

Chen, Shuwei; Qin, Zhangfeng; Xu, Xiufeng; Wang, Jianguo

doi:10.1016/j.apcata.2006.01.003

Cited by 67 publications

(49 citation statements)

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“…The easy redox cycle between fully oxidized and reduced vanadium species generates a highly active catalyst [31,[34][35][36][37]. The variation of catalytic activity of V/SBA catalysts with vanadium content follows the same trend as the amount of dispersed vanadium species (Table 1), suggesting that the dispersed vanadium species on the SBA-15 support are mainly responsible for the catalytic activity in isobutane dehydrogenation with CO 2 .…”

Section: Catalytic Performancementioning

confidence: 65%

“…At higher V content, there are two reduction peaks. The peak at low temperature (peak I) is attributed to the reduction of dispersed vanadium species, while the peak at high temperature (peak II) is assigned to the reduction of crystalline V2O5 [30,31]. The TPR results show that in addition to the dispersed vanadium species, large crystals of V2O5 exist on the V/SBA samples with a V content of 3% and above.…”

Section: Characterization Of Catalystsmentioning

confidence: 79%

“…For the sake of comparison, the profile and data of 7% V/MCM are also included. Only one reduction peak centered at 483 °C is observed on the V/SBA sample with a V content as low as 1%, corresponding to the reduction of V 5+ [30][31][32]. At higher V content, there are two reduction peaks.…”

Section: Characterization Of Catalystsmentioning

confidence: 89%

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Dehydrogenation of Isobutane with Carbon Dioxide over SBA-15-Supported Vanadium Oxide Catalysts

et al. 2016

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A series of vanadia catalysts supported on SBA-15 (V/SBA) with a vanadia (V) content ranging from 1% to 11% were prepared by an incipient wetness method. Their catalytic behavior in the dehydrogenation of isobutane to isobutene with CO 2 was examined. The catalysts were characterized by N 2 adsorption, X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy, and temperature-programmed reduction (TPR). It was found that these catalysts were effective for the dehydrogenation reaction, and the catalytic activity is correlated with the amount of dispersed vanadium species on the SBA-15 support. The 7% V/SBA catalyst shows the highest activity, which gives 40.8% isobutane conversion and 84.8% isobutene selectivity. The SBA-15-supported vanadia exhibits higher isobutane conversion and isobutene selectivity than the MCM-41-supported one.

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Section: Catalytic Performancementioning

confidence: 65%

Section: Characterization Of Catalystsmentioning

confidence: 79%

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Dehydrogenation of Isobutane with Carbon Dioxide over SBA-15-Supported Vanadium Oxide Catalysts

et al. 2016

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“…CO 2 can also decrease the partial pressure of reactants more effectively than steam, and it has the highest heat capacity among various gases. 12,14 In addition, in the presence of CO 2 , coupling between reverse water−gas shift reaction…”

Section: ■ Introductionmentioning

confidence: 99%

Role Of CO₂ As a Soft Oxidant For Dehydrogenation of Ethylbenzene to Styrene over a High-Surface-Area Ceria Catalyst

Zhang¹,

Wu²,

Nelson

et al. 2015

ACS Catal.

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Catalytic performance and the nature of surface adsorbates were investigated for high-surface-area ceria during the ethylbenzene oxidative dehydrogenation (ODH) reaction using CO2 as a soft oxidant. The high surface area ceria material was synthesized using a template-assisted method. The interactions among ethylbenzene, styrene, and CO2 on the surface of ceria and the role of CO2 for the ethylbenzene ODH reaction have been investigated in detail by using activity test, in situ diffuse reflectance infrared and Raman spectroscopy. CO2 as an oxidant not only favored the higher yield of styrene but also inhibited the deposition of coke during the ethylbenzene ODH reaction. Ethylbenzene ODH reaction over ceria followed a two-step pathway: ethylbenzene is first dehydrogenated to styrene with H2 formed simultaneously, and then CO2 reacts with H2 via the reverse water gas shift. The produced styrene can easily undergo polymerization to form polystyrene, which is a key intermediate for coke formation. In the absence of CO2, the produced polystyrene transforms into graphite-like coke at temperatures above 500 °C, which leads to catalyst deactivation. In the presence of CO2, the coke deposition can be effectively removed via oxidation with CO2. ABSTRACT: Catalytic performance and the nature of surface adsorbates were investigated for high-surface-area ceria during the ethylbenzene oxidative dehydrogenation (ODH) reaction using CO 2 as a soft oxidant. The high surface area ceria material was synthesized using a template-assisted method. The interactions among ethylbenzene, styrene, and CO 2 on the surface of ceria and the role of CO 2 for the ethylbenzene ODH reaction have been investigated in detail by using activity test, in situ diffuse reflectance infrared and Raman spectroscopy. CO 2 as an oxidant not only favored the higher yield of styrene but also inhibited the deposition of coke during the ethylbenzene ODH reaction. Ethylbenzene ODH reaction over ceria followed a two-step pathway: ethylbenzene is first dehydrogenated to styrene with H 2 formed simultaneously, and then CO 2 reacts with H 2 via the reverse water gas shift. The produced styrene can easily undergo polymerization to form polystyrene, which is a key intermediate for coke formation. In the absence of CO 2 , the produced polystyrene transforms into graphite-like coke at temperatures above 500°C, which leads to catalyst deactivation. In the presence of CO 2 , the coke deposition can be effectively removed via oxidation with CO 2 .

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“…Among several reported supports, alumina has major contribution because of their surface area, better redox properties, and high thermal stability. The molecular structure and reactivity of Vanadia supported alumina have been keenly investigated for few decades over dehydrogenation of EB [22][23][24][25]. Also, the CeO 2 -based mixed oxides are effective catalysts for the oxidation of different hydrocarbons and for the removal of total organic carbon from polluted waters from different sources [26,27].…”

Section: Introductionmentioning

confidence: 99%

The advantage of ceria loading over V2O5/Al2O3 catalyst for vapor phase oxidative dehydrogenation of ethylbenzene to styrene using CO2 as a soft oxidant

et al. 2016

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The present work highlights the influence of ceria over vanadia/alumina for the oxidative dehydrogenation of ethylbenzene to styrene with CO 2 as a soft oxidant. Various weight loadings (0, 3, 5, and 7 %) of ceria were incorporated into 10wt % V 2 O 5 /Al 2 O 3 catalyst by wet impregnation process. Structural and textural characterizations of the catalysts were performed by means of powder X-ray diffraction, temperature-programmed reduction, temperature-programmed desorption of CO 2 , N 2 adsorption-desorption analysis. Over 10 % V 2 O 5 /Al 2 O 3 , ethylbenzene conversion decreases from 62 to 49 % in a spam of 12 h. Ceria-incorporated catalyst (3 % CeO 2 /10 % V 2 O 5 /Al 2 O 3 ) showed steady ethylbenzene conversion of nearly 65 % with a styrene selectivity of 96 % for a period of 12 h time. Improved catalytic activity observed on this catalyst can be attributed to the increase in the number of redox/active VO x species after incorporation of ceria. The redox properties of 3 % CeO 2 /10 % V 2 O 5 /Al 2 O 3 and 10wt % V 2 O 5 /Al 2 O 3 were examined by reaction of CO 2 in pulses on to the partially reduced catalysts. The spent catalysts were characterized using XRD & TPR analysis to assess the reason for the deactivation of catalysts.

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Structure and properties of the alumina-supported vanadia catalysts for ethylbenzene dehydrogenation in the presence of carbon dioxide

Cited by 67 publications

References 47 publications

Dehydrogenation of Isobutane with Carbon Dioxide over SBA-15-Supported Vanadium Oxide Catalysts

Dehydrogenation of Isobutane with Carbon Dioxide over SBA-15-Supported Vanadium Oxide Catalysts

Role Of CO₂ As a Soft Oxidant For Dehydrogenation of Ethylbenzene to Styrene over a High-Surface-Area Ceria Catalyst

The advantage of ceria loading over V2O5/Al2O3 catalyst for vapor phase oxidative dehydrogenation of ethylbenzene to styrene using CO2 as a soft oxidant

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Structure and properties of the alumina-supported vanadia catalysts for ethylbenzene dehydrogenation in the presence of carbon dioxide

Cited by 67 publications

References 47 publications

Dehydrogenation of Isobutane with Carbon Dioxide over SBA-15-Supported Vanadium Oxide Catalysts

Dehydrogenation of Isobutane with Carbon Dioxide over SBA-15-Supported Vanadium Oxide Catalysts

Role Of CO2 As a Soft Oxidant For Dehydrogenation of Ethylbenzene to Styrene over a High-Surface-Area Ceria Catalyst

The advantage of ceria loading over V2O5/Al2O3 catalyst for vapor phase oxidative dehydrogenation of ethylbenzene to styrene using CO2 as a soft oxidant

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Role Of CO₂ As a Soft Oxidant For Dehydrogenation of Ethylbenzene to Styrene over a High-Surface-Area Ceria Catalyst