Chemisorptive and catalytic properties of V2O5 supported on phosphate modified γ-alumina

Lakshmi, L. Jhansi; Narsimha, K.; Rao, P. Kanta

doi:10.1016/0926-860x(93)80045-r

Cited by 14 publications

(6 citation statements)

References 35 publications

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“…Experiments on vanadia supported on phosphate modified γ-Al 2 O 3 was conducted by Lakshmi et al [203] at 175 • C with 4 vol.% MeOH in the feed. The highest conversion was 30.5%, and the total selectivity towards FA and DME was approximately 98% for the investigated catalyst loadings, with increasing conversion and selectivity to FA (decreasing towards DME) with higher vanadia loadings; thus, FA selectivity was 83.5% with 20 wt% vanadia [203].…”

Section: •+mentioning

confidence: 99%

“…Figure 35. Summary of catalytic test results for V oxide catalysts in the literature shown as selectivity vs. conversion [125,140,166,169,179,180,188,199,201,203,204,207,208].…”

Section: •+mentioning

confidence: 99%

“…Moreover, catalysts with basic supports such as ZrO 2 , TiO 2 , and Bi oxides had, in general, high activity and good selectivity if the temperatures were low (points in Figure 35) [100,125,131]; however, at industrially relevant temperatures, they catalyzed full oxidation to CO and CO 2 [125,131]. Vanadia supported on the more acidic Al 2 O 3 and SiO 2 supports had higher selectivity towards dehydration products [100,199,203] and were generally less active than the basic and reducible supports [100,179,184].…”

Section: •+mentioning

confidence: 99%

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A Review and Experimental Revisit of Alternative Catalysts for Selective Oxidation of Methanol to Formaldehyde

et al. 2021

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The selective oxidation of methanol to formaldehyde is a growing million-dollar industry, and has been commercial for close to a century. The Formox process, which is the largest production process today, utilizes an iron molybdate catalyst, which is highly selective, but has a short lifetime of 6 months due to volatilization of the active molybdenum oxide. Improvements of the process’s lifetime is, thus, desirable. This paper provides an overview of the efforts reported in the scientific literature to find alternative catalysts for the Formox process and critically assess these alternatives for their industrial potential. The catalysts can be grouped into three main categories: Mo containing, V containing, and those not containing Mo or V. Furthermore, selected interesting catalysts were synthesized, tested for their performance in the title reaction, and the results critically compared with previously published results. Lastly, an outlook on the progress for finding new catalytic materials is provided as well as suggestions for the future focus of Formox catalyst research.

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Section: •+mentioning

confidence: 99%

“…Figure 35. Summary of catalytic test results for V oxide catalysts in the literature shown as selectivity vs. conversion [125,140,166,169,179,180,188,199,201,203,204,207,208].…”

Section: •+mentioning

confidence: 99%

Section: •+mentioning

confidence: 99%

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A Review and Experimental Revisit of Alternative Catalysts for Selective Oxidation of Methanol to Formaldehyde

et al. 2021

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“…On the development of novel catalytic materials we recently studied the alkali earth metal molybdates (MgMoO4, CaMoO4, SrMoO4 and BaMoO4) 36 and MoO3 supported on hydroxyapatite and the strontium analogue as catalysts for the selective oxidation of methanol to formaldehyde, and found the apatite supported catalysts showed impressive catalytic stability 37 . Several studies of alternative catalytic systems for the selective oxidation of methanol to formaldehyde have been published, with some focus on molybdenum oxide [38][39][40][41][42][43][44][45][46][47] and other metal oxide catalysts 38,[47][48][49][50][51][52][53] , but most of it on vanadium containing catalysts, such as vanadates 3,47,[54][55][56][57][58][59][60] , phosphates [61][62][63][64] and vanadium oxide 46,47,49,[65][66][67][68][69][70][71][72][73]…”

Section: Introductionmentioning

confidence: 99%

Hydroxyapatite supported molybdenum oxide catalyst for selective oxidation of methanol to formaldehyde: studies of industrial sized catalyst pellets

Thrane

Mentzel

Thorhauge

et al. 2021

Catal. Sci. Technol.

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“…The details of the experimental procedure are described elsewhere. 15 BET surface areas of the catalysts were determined by N 2 physisorption using the same equipment.…”

Section: Introductionmentioning

confidence: 99%

Influence of Metal Oxide Modification of Alumina on the Dispersion and Activity of Vanadia Catalysts

Lakshmi¹,

Alyea²,

Srinivas³

et al. 1997

J. Phys. Chem. B

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Alumina was modified with 10 wt % MO x (MO x ) TiO 2 , ZrO 2 , La 2 O 3 , or MgO) prior to its impregnation with 12 wt % vanadia. The catalysts VTiAl, VZrAl, VLaAl, and VMgAl were characterized by X-ray diffraction (XRD), electron spin resonance (ESR), FT-Raman spectroscopy, 51 V solid state nuclear magnetic resonance ( 51 V NMR), and oxygen chemisorption. The activities of the catalysts were determined by methanol partial oxidation and their acid-base properties were evaluated for the decomposition of 2-propanol. XRD and FT-Raman spectroscopy indicated the formation of bulk TiO 2 and ZrO 2 on the titania and zirconia modified alumina. 51 V solid state NMR results suggest the presence of both octahedrally and tertrahedrally coordinated vanadia species in the catalysts VTiAl, VZrAl, and VAl and the presence of tetrahedrally coordinated vanadia species in the catalysts VLaAl and VMgAl. ESR spectra recorded at ambient temperature showed the presence of V 4+ ions having axial symmetry. Oxygen chemisorption results indicated an enhanced number of reducible vanadia sites, i.e., redox sites in the modified catalysts. Metal oxide modification is found to influence significantly the surface coverage and the methanol partial oxidation activity of vanadia supported on alumina. With proper MO x modification enhanced reducibility of vanadia could be attained, which in turn makes the partial oxidation reaction of methanol more facile.

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Chemisorptive and catalytic properties of V2O5 supported on phosphate modified γ-alumina

Cited by 14 publications

References 35 publications

A Review and Experimental Revisit of Alternative Catalysts for Selective Oxidation of Methanol to Formaldehyde

A Review and Experimental Revisit of Alternative Catalysts for Selective Oxidation of Methanol to Formaldehyde

Hydroxyapatite supported molybdenum oxide catalyst for selective oxidation of methanol to formaldehyde: studies of industrial sized catalyst pellets

Influence of Metal Oxide Modification of Alumina on the Dispersion and Activity of Vanadia Catalysts

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