Heteropoly compounds as catalysts for hydrogenation of propanoic acid

Benaissa, Hacib; Davey, Paul N.; Khimyak, Yaroslav Z.; Kozhevnikov, Ivan V.

doi:10.1016/j.jcat.2007.11.011

Cited by 42 publications

(25 citation statements)

References 6 publications

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“…Partial substitution of Mo(VI) by V(V) in the PMo 12 VO 40 ] was zero order in propanoic acid with an activation energy of 85 kJ mol -1 . The formation of propanal was suggested to occur via a Mars-Van Krevelen mechanism [167]. In recent year electrochemical properties of POMs have been intensively studied [168] An important reason is the ability of POMs anions to accept various numbers of electrons giving rise to mixed-valency species, which has made these compounds very attractive in electrode modification and electrocatalytic research [169].…”

Section: Hydrogenation Of Propanoic Acidmentioning

confidence: 99%

Recent developments in use of heteropolyacids, their salts and polyoxometalates in organic synthesis

Heravi

Sadjadi

2009

JICS

111

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Heteropolyacids, their salts and polyoxometalates have been used as catalysts in wide range of organic reactions such as multi components, oxidation, reductions, electrochemical and photochemical reactions. There have been tremendous and continued efforts to modify the catalytic performance of heteropoly acids such as supporting them on MCM, silica gel, etc. In this review, we have attempted to bring some of new applications of heteropolyacids in organic reactions and recent approaches on modifying them, into focus.

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Section: Hydrogenation Of Propanoic Acidmentioning

confidence: 99%

Recent developments in use of heteropolyacids, their salts and polyoxometalates in organic synthesis

Heravi

Sadjadi

2009

JICS

111

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“…In this sense they are regarded as potentially environmentally friendly solid acid catalysts. [7][8][9] In bulk form heteropolyacids have a low specific surface area (< 10 m 2 g -1 ) but they can alternatively be used in supported form when the reaction needs to be performed heterogeneously. A heterogeneous reaction advantageously enables the separation of the catalyst from the products and unreacted reactants.…”

Section: Introductionmentioning

confidence: 99%

H3PW12O40 (HPA), an efficient and reusable catalyst for biodiesel production related reactions: esterification of oleic acid and etherification of glycerol

Sepúlveda¹,

Vera²,

Yori³

et al. 2011

Quím. Nova

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Recebido em 4/5/10; aceito em 17/11/10; publicado na web em 14/3/11In esterification of oleic acid with methanol at 25 °C HPA displayed the highest activity. Moreover the HPA could be reused after being transformed into its cesium salt. In the reaction of etherification of glycerol HPA and Amberlyst 35W showed similar initial activity levels. The results of acid properties demonstrate that HPA is a strong protonic acid and that both surface and bulk protons contribute to the acidity. Because of its strong affinity for polar compounds, HPA is also seemingly dissolved in both oleic acid and methanol. The reaction in this case proceeds with the catalyst in the homogenous phase.

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“…Figure 4( The band for δ(O-P-O) appeared at 594 cm -1 . 24,25 And the final band in these spectra observed at 522 cm -1 can be characteristized by the vibration symmetric for W-O-W. 15,24,25 Temperature-Programmed Desorption (TPD) Figure 5(a) and 5(b) shows the NH 3 -TPD profiles for both Cs HPAs. The NH 3 uptake is propotional to the number of acid sites present in the catalyst.…”

Section: Thermal Study By Using Tga and Dscmentioning

confidence: 94%

Selective synthesis of PEG-monoester using cesium heteropoly acid as heterogeneous catalyst

et al. 2017

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Esterification of oleic acid with polyethylene glycol 600 (PEG-600) to produce polyethylene glycol monooleate (PEG-monooleate) and polyethylene glycol dioleate (PEG-dioleate) as by-product has been studied in the presence of heterogeneous acid catalysts, i.e. cesium heteropoly acid (Cs HPA). The results are compared with those obtained from a classical homogeneous acid catalyst; p-toluene sulphonic acid (p-TSA). The reaction was conducted under nitrogen flow with vigorous stirring at 130 °C and 150 °C. The catalyst loading kept at 4% and the reaction was monitored at 1, 3, 7 and 24 hours. Reaction samples were analyzed using high performance liquid chromatography (HPLC) equipped with evaporative light scattering detector (ELSD). The results obtained showed that Cs HPAs exhibit 100% selectivity of PEG-monooleate from the first hour until 24 hours. However, this does not happen with homogeneous p-TSA, where formation of by-product; PEG-dioleate is observed in the initial stage. It is also showed that the mole ratio is the most important parameter not only to produce high yield of monoester but also to maintain it along the reaction. Chemical and physical properties of catalysts were characterized using Thermal Gravimetric Analysis (TGA), Differential Scanning Calorimetry (DSC), Fourier Tranmittance Infra-Red (FTIR), ammonia temperature programmed desorption (NH 3 -TPD) and X-ray Diffraction (XRD).

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Heteropoly compounds as catalysts for hydrogenation of propanoic acid

Cited by 42 publications

References 6 publications

Recent developments in use of heteropolyacids, their salts and polyoxometalates in organic synthesis

Recent developments in use of heteropolyacids, their salts and polyoxometalates in organic synthesis

H3PW12O40 (HPA), an efficient and reusable catalyst for biodiesel production related reactions: esterification of oleic acid and etherification of glycerol

Selective synthesis of PEG-monoester using cesium heteropoly acid as heterogeneous catalyst

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