Preparation, characterization, and activity of Al2O3-supported V2O5 catalysts

Reddy, E. Padmanabha

doi:10.1016/j.jcat.2003.07.011

Cited by 112 publications

(38 citation statements)

References 30 publications

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“…Octa-tert-butylcalix [8]arene 2 and sodium calix [8]areneoctasulfonate 3 were synthesized by known procedures [30,31]. For the non-templated reference materials (A01C, A02C, T01C, and S01C, Table 1), vanadate was deposited on the corresponding solid support, using NH 4 VO 3 -H 2 C 2 O 4 as vanadate precursor, according to the known technique [32].…”

Section: Preparation Of Catalystsmentioning

confidence: 99%

Phthalocyanine- and Calixarene-Templating Effect on the Catalytic Performance of Solid Supported Vanadates

et al. 2011

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Catalytic performance of solid supported monovanadate catalysts toward oxidation of propane is significantly affected by the templating effect of: (1) pretreatment of the solid support with calixarene derivatives before deposition of ammonium vanadate, (2) direct deposition of vanadyl phthalocyanine as the vanadate precursor. This effect is believed to be linked to the accessibility of the active sites, and was studied in comparison with a reference mesoporous support.

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Section: Preparation Of Catalystsmentioning

confidence: 99%

Phthalocyanine- and Calixarene-Templating Effect on the Catalytic Performance of Solid Supported Vanadates

et al. 2011

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“…But BET and XRF characterizations revealed that vanadium element does exist in the catalysts. It is a clear indication that V 2 O 5 phase is in a highly dispersed state[27].XPS analysisThe surface oxidation states of copper, vanadium and alumina were studied by XPS measurements. Figs.…”

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confidence: 99%

Direct amination of toluene to toluidine with hydroxylamine over CuO–V2O5/Al2O3 catalysts

Gao

Zhang

Wang

et al. 2011

Reac Kinet Mech Cat

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A series of CuO-V 2 O 5 /Al 2 O 3 catalysts were prepared and characterized by various techniques such as XRF, BET, XPS and XRD. These catalysts were used for liquid-phase amination of toluene to toluidines. It was found that adding copper species to V 2 O 5 /Al 2 O 3 catalyst showed a peculiar behavior, maintaining a high activity toward toluene amination. An optimum CuO content appeared at 1.6 wt% with a CuO/V 2 O 5 molar ratio of 0.25. More than 60% total yield of toluidines was obtained over 1.6%CuO-15%V 2 O 5 /Al 2 O 3 catalyst under optimized conditions. Catalyst characterizations revealed that the addition of copper improved the formation of V 5? species, thus enhancing the activity of the catalyst.

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“…In our present study, the catalyst VA showed a high intense signal at around 803 K and another small intense shoulder peak at around 943 K. The low-temperature peak might be attributed to the reduction of dispersed surface vanadium species mostly due to the presence of monomeric phase (tetragonal phase) of the vanadia species, while the high temperature peak should be ascribed to the reduction of bulk V 2 O 5 -like V 5? species with lower intensity [41][42][43]. With incorporation of 3 weight % of ceria (3VCA), T max shifted to higher temperature suggesting increase in the interaction between CeO 2 and VO x .…”

Section: H 2 -Tpr Resultsmentioning

confidence: 98%

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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Preparation, characterization, and activity of Al2O3-supported V2O5 catalysts

Cited by 112 publications

References 30 publications

Phthalocyanine- and Calixarene-Templating Effect on the Catalytic Performance of Solid Supported Vanadates

Phthalocyanine- and Calixarene-Templating Effect on the Catalytic Performance of Solid Supported Vanadates

Direct amination of toluene to toluidine with hydroxylamine over CuO–V2O5/Al2O3 catalysts

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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