The novel and highly selective fumed silica-supported VPO for partial oxidation of n-butane to maleic anhydride

Xiao, Chao; Chen, Xi; Wang, Z. Y.; Ji, Wei; Chen, Y.; Au, Chak Tong

doi:10.1016/j.cattod.2004.06.127

Cited by 22 publications

(6 citation statements)

References 20 publications

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“…The peaks (Figure 5) below 700 °C and above 700 °C are attributed to the removal of lattice oxygen related to V 5+ and V 4+ species, respectively. 32,33 Only the removal of lattice oxygen related to V 5+ can be observed clearly; the results are in good agreement with XRD measurements. When the six catalysts are compared, the reduction temperature of VPO/γ-Al 2 O 3 is the lowest and even lower than that of pure VPO (529 and 752 °C; the profile is presented in Figure S4).…”

Section: Resultssupporting

confidence: 81%

Effects of Support for Vanadium Phosphorus Oxide Catalysts on Vapor-Phase Aldol Condensation of Methyl Acetate with Formaldehyde

Zhao

Zuo

Yang

et al. 2016

Ind. Eng. Chem. Res.

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Vapor-phase aldol condensation of methyl acetate with formaldehyde over vanadium phosphorus oxide (VPO) deposited on SiO 2 , TiO 2 , ZrO 2 , Nb 2 O 5 , Sb 2 O 3 , γ-Al 2 O 3 , and n-γ-Al 2 O 3 (γ-Al 2 O 3 treated with H 3 PO 4 ) for methyl acrylate production was developed. The VPO/n-γ-Al 2 O 3 was found to have the best performance based on the evaluated experiments in a fixed-bed reactor. The physicochemical properties of the catalysts were investigated by different characterization methods such as the Brunauer−Emmett−Teller method, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, H 2 temperature programmed reduction, Fourier transfrom infrared spectroscopy, and NH 3 -and CO 2 -temperature programmed desorption. The influence of P−OH intensity and acid strength on activity was obtained through systematic studies over the formation process of VPO phases and the acidity distribution. Preparation and reaction parameters were investigated and optimized.

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Section: Resultssupporting

confidence: 81%

Effects of Support for Vanadium Phosphorus Oxide Catalysts on Vapor-Phase Aldol Condensation of Methyl Acetate with Formaldehyde

Zhao

Zuo

Yang

et al. 2016

Ind. Eng. Chem. Res.

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“…Therefore, H 2 -TPR was applied for identifying the vanadium oxidation state in various samples. As shown in Figure , the TPR profiles could be deconvoluted into two or three components via curve-fitting analysis, and the derived peaks below 700 °C and beyond 700 °C were attributed to the reduction of V 5+ and V 4+ species, respectively. , The H 2 consumption was calibrated and listed in Table S1 (SI). According to our previous study, the two reduction peaks below 700 °C in Figure were due to the reduction of different V 5+ -phases.…”

Section: Resultsmentioning

confidence: 99%

Sustainable Acrylic Acid Making via Acetic Acid–Formaldehyde Condensation: The Highly Selective and Durable VPO-TiO₂ Catalyst Accomplished by VPO Phase Control and Wet Co-Mechanical Milling

Liu

Wang

et al. 2020

ACS Sustainable Chem. Eng.

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On the basis of the precise phase control of vanadium phosphorus oxides (VPOs), nanosized TiO 2 was employed as a dopant/dispersant to fabricate a series of VPO-TiO 2 catalysts through a wet mechanical co-milling process. The resulting catalysts showed outstanding durability plus excellent target products [acrylic acid (AA) + methyl acrylate (MA)] selectivity via acetic acid (HAc)−formaldehyde (FA) condensation. Over an optimized catalyst of 20% VPO-TiO 2 , the (AA + MA) selectivity being 85% (HAc input-based) at a yield level >60% (FA input-based) can be achieved after 180-h running, the best known to date over the VPObased catalysts. The detailed characterizations including X-ray powder diffraction, Raman spectra, XPS, and H 2 -TPR indicated that the V 5+ in the original VOPO 4 phase would be partially reduced in the presence of TiO 2 after the milling process in the cyclohexane medium; and the partially reduced VOPO 4 phase together with the decorated TiO 2 component stabilized the remaining V 5+ entities and considerably slowed down the continuous reduction of surface V 5+ species, accounting for substantially enhanced catalyst durability as well as target product selectivity. The NH 3 -/CO 2 -TPD results demonstrated that the surface acid−base property also varied notably with the VPO content which in turn controlled the HAc conversion and (MA + AA) selectivity accordingly.

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“…There are other supports such as MCM-41, Al-MCM-41, fumed silica, silica, alumina, titania, phosphoric acid treated zirconia which are also used as the supports for VPO catalyst. [30][31][32][33] It is well documented that the use of a support for metal oxide catalysts favours enhancement of active phase dispersion and also imparts stability to the catalysts. The use of supported catalyst during glycerol dehydration reaction have several advantages such as the enhancement of dispersion of the active phase on the support, the distribution of the pore size of the support and the acidity of the catalyst.…”

Section: Introductionmentioning

confidence: 99%

Vapour phase dehydration of glycerol over VPO catalyst supported on zirconium phosphate

Rajan

Rao

Pavankumar

et al. 2014

Catal. Sci. Technol.

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The novel and highly selective fumed silica-supported VPO for partial oxidation of n-butane to maleic anhydride

Cited by 22 publications

References 20 publications

Effects of Support for Vanadium Phosphorus Oxide Catalysts on Vapor-Phase Aldol Condensation of Methyl Acetate with Formaldehyde

Effects of Support for Vanadium Phosphorus Oxide Catalysts on Vapor-Phase Aldol Condensation of Methyl Acetate with Formaldehyde

Sustainable Acrylic Acid Making via Acetic Acid–Formaldehyde Condensation: The Highly Selective and Durable VPO-TiO₂ Catalyst Accomplished by VPO Phase Control and Wet Co-Mechanical Milling

Vapour phase dehydration of glycerol over VPO catalyst supported on zirconium phosphate

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The novel and highly selective fumed silica-supported VPO for partial oxidation of n-butane to maleic anhydride

Cited by 22 publications

References 20 publications

Effects of Support for Vanadium Phosphorus Oxide Catalysts on Vapor-Phase Aldol Condensation of Methyl Acetate with Formaldehyde

Effects of Support for Vanadium Phosphorus Oxide Catalysts on Vapor-Phase Aldol Condensation of Methyl Acetate with Formaldehyde

Sustainable Acrylic Acid Making via Acetic Acid–Formaldehyde Condensation: The Highly Selective and Durable VPO-TiO2 Catalyst Accomplished by VPO Phase Control and Wet Co-Mechanical Milling

Vapour phase dehydration of glycerol over VPO catalyst supported on zirconium phosphate

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Sustainable Acrylic Acid Making via Acetic Acid–Formaldehyde Condensation: The Highly Selective and Durable VPO-TiO₂ Catalyst Accomplished by VPO Phase Control and Wet Co-Mechanical Milling