Synthesis of biodiesel over zirconia-supported isopoly and heteropoly tungstate catalysts

Sunita, G.; Devassy, Biju M.; Vinu, Ajayan; Sawant, Dhanashri P.; Balasubramanian, Veerappan V.; Halligudi, S.B.

doi:10.1016/j.catcom.2007.08.007

Cited by 135 publications

(53 citation statements)

References 15 publications

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“…In the FTIR spectrum of AMT1 ( The peaks belonging to the metatungstate ion were observable mostly below 1000 cm -1 , which could be identified based on the FTIR data of pure polytungstates, AMT composites and WO 3 [36,[41][42][43][44][45], as the FTIR spectrum of AMT has not been published previously.…”

Section: Characterization Of Amt1mentioning

confidence: 96%

Structure and thermal decomposition of ammonium metatungstate

Hunyadi

Sajó

Szilágyi

2013

J Therm Anal Calorim

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The structure, morphology of ammonium metatungstate (AMT), (NH 4 formed between 380-500 °C, (iv) which then transformed into the more stable m-WO 3 between 500-600 °C. As a difference in air, the as-formed NH 3 ignited with an exothermic heat effect, and nitrous oxides formed as combustion products. The thermal behavior of AMT was similar to ammonium paratungstate (APT), (NH 4 ) 10 [H 2 W 12 O 42 ]•4H 2 O, the only main difference being the lack of dry NH 3 evolution between 170-240 °C in the case of AMT.)

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Section: Characterization Of Amt1mentioning

confidence: 96%

Structure and thermal decomposition of ammonium metatungstate

Hunyadi

Sajó

Szilágyi

2013

J Therm Anal Calorim

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“…Not only they are not affec-ted by the presence of acids but they can also be easily separated from the reaction products. Tungsten-zirconia, 19 sulfated-zirconia, 20 polyvinylsulfonic resins 21 and heteropolyacids, 22,23 have been recently used for the catalytic synthesis of biodiesel.…”

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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“…HPAs in water have also been used in inorganic chemistry for the synthesis of hybrid nanocomposite membranes (42,43) and many new and diverse catalysts (44)(45)(46)(47)(48)(49)(50)(51)(52). HPAs have been extensively used in analytical chemistry for determination and removal of metal ions like phosphates (49,(53)(54)(55), arsenates (55)(56)(57)(58), arsenic (57)(58)(59)(60)(61)(62)(63)(64), silicates (65)(66)(67)(68), and many other ions (69, 70) from aqueous solutions.…”

Section: Hpa-water Systemmentioning

confidence: 99%

Heteropoly acids-catalyzed organic reactions in water: doubly green reactions

Heravi

Fard

Faghihi

2013

Green Chemistry Letters and Reviews

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The organic reactions in water, as the most significant green solvent, have attracted much attention due to their unique properties over conventional organic ones. In the catalytic area, heteropoly acids (HPAs) are also promising green solid acids to replace environmentally harmful liquid acid catalysts. Herein, we wish to report the organic reactions catalyzed by HPAs, their salt, and polyoxometalates (POMs) in aqueous systems.

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Synthesis of biodiesel over zirconia-supported isopoly and heteropoly tungstate catalysts

Cited by 135 publications

References 15 publications

Structure and thermal decomposition of ammonium metatungstate

Structure and thermal decomposition of ammonium metatungstate

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

Heteropoly acids-catalyzed organic reactions in water: doubly green reactions

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