Samarium‐exchanged Heteropoly Tungstate: An Efficient Solid Acid Catalyst for the Synthesis of Glycerol Carbonate from Glycerol and Benzylation of Anisole

Kumar, Ch. Ramesh; Jagadeeswaraiah, K.; Prasad, P. S. Sai; Lingaiah, N.

doi:10.1002/cctc.201200110

Cited by 74 publications

(48 citation statements)

References 55 publications

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“…[7,8,12,13,15,16] The tungsten heteropolyacids are known for their relative thermal instability. However, this type of catalyst has been successfully applied in similar conditions, [21] even on an industrial scale. [22] The performance of the additives tungstic acid, phosphotungstic acid and silicotungstic acid was tested in combination with four hydrogenation catalysts.…”

Section: Resultsmentioning

confidence: 99%

Pt/Al₂O₃ Catalyzed 1,3‐Propanediol Formation from Glycerol using Tungsten Additives

et al. 2012

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Screening of four commercial catalysts (Pt/Al2O3, Pt/SiO2, Pd/Al2O3, and Pd/SiO2) and four acidic additives (hydrochloric, tungstic, phosphotungstic, and silicotungstic acids) shows that the combination of a platinum hydrogenation catalyst with tungsten containing acidic additives yields 1,3‐propanediol from aqueous glycerol. The performance of the best catalytic system Pt/Al2O3 with silicotungstic acid as an additive was optimized by experimental design, capturing the influence of reaction time, glycerol concentration, acid concentration, pressure, and temperature on the formation of 1,3‐propanediol from glycerol. High 1,3‐propanediol yield in an aqueous batch system can be achieved (49 % conversion, 28 % selectivity) with excellent 1,3‐propanediol to 1,2‐propanediol ratios. A mechanistic interpretation is given for this bifunctional system, supported by the relative stability of 1,3‐propanediol in comparison with 1,2‐propanediol under the chosen reaction conditions.

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Section: Resultsmentioning

confidence: 99%

Pt/Al₂O₃ Catalyzed 1,3‐Propanediol Formation from Glycerol using Tungsten Additives

et al. 2012

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“…18 The probable transesterification mechanism between triglyceride and methanol is shown in Scheme 2. Very high surface area and pore dimension of the present catalyst plays an important role in diffusion of large substrate molecules on to the strong acidic sites of the catalyst.…”

Section: Proposed Mechanism For Carboxylation Reactionmentioning

confidence: 99%

Facile synthesis of glycerol carbonate via glycerolysis of urea catalysed by silicotungstates impregnated into MCM-41

Narkhede

Patel

2015

RSC Adv.

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The present contribution includes the solvent free environmentally benign route towards synthesis of glycerol carbonate via glycerolysis of urea. The parent as well as monolacunary silicotungstates impregnated to MCM-41 were used as efficient catalysts. The effect of different reaction parameters on the conversion of glycerol was investigated in order to optimize the reaction parameters for maximum conversion. The activities of both the catalysts have been correlated with the structural features and acidity of the catalysts and the possible mechanism has also been proposed. The catalysts were also recycled up to four times without significant loss in the activity.

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“…37,38 An alternative route for the GC synthesis is carbonation of glycerol with dimethyl carbonate or urea. Several authors studied the performance of solid catalysts including ZnO, 39 zinc sulfate, 40 ZnCl 2 , 41 γ -zirconium phosphate, 42 HTc-Zn derived from hydrotalcite, 43 Co 3 O 4 /ZnO, 44 Sm exchanged heteropoly tungstate, 45 gold supported ZSM-5, 46 manganese sulfate, 46 etc., for the preparation of GC from glycerol and urea. Although useful catalysts are reported, it is still a challenging task to develop new heterogeneous catalysts having a high performance under milder conditions.…”

Section: Introductionmentioning

confidence: 99%

Understanding the surface and structural characteristics of tungsten oxide supported on tin oxide catalysts for the conversion of glycerol

et al. 2015

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Catalysts with varying WO 3 content on SnO 2 were prepared and characterized by X-ray diffraction, in situ Raman spectroscopy, X-ray photoelectron spectroscopy and temperature programmed desorption of NH 3 . In situ Raman analysis reveals the presence isolated monomers and polymeric species of WO 3 . These catalysts were evaluated for the conversion of glycerol into value added chemicals. Etherification of glycerol with tertiary butanol and preparation of glycerol carbonate from glycerol and urea are studied over these catalysts. The catalytic activity results suggest that the glycerol conversion and selectivity depends on the morphology of WO 3 which in turn is related to its content in the catalyst. The catalysts with 5 wt.% of WO 3 on SnO 2 resulted in high dispersion with larger number of strong acidic sites. The selectivity in the glycerol etherification is related to the nature of the catalyst and reaction time. These catalysts also exhibited high activity for synthesis of glycerol carbonate. The effect of various reaction parameters was studied to optimize the reaction conditions. The catalysts also exhibited consistent activity upon reuse.

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Samarium‐exchanged Heteropoly Tungstate: An Efficient Solid Acid Catalyst for the Synthesis of Glycerol Carbonate from Glycerol and Benzylation of Anisole

Cited by 74 publications

References 55 publications

Pt/Al₂O₃ Catalyzed 1,3‐Propanediol Formation from Glycerol using Tungsten Additives

Pt/Al₂O₃ Catalyzed 1,3‐Propanediol Formation from Glycerol using Tungsten Additives

Facile synthesis of glycerol carbonate via glycerolysis of urea catalysed by silicotungstates impregnated into MCM-41

Understanding the surface and structural characteristics of tungsten oxide supported on tin oxide catalysts for the conversion of glycerol

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Samarium‐exchanged Heteropoly Tungstate: An Efficient Solid Acid Catalyst for the Synthesis of Glycerol Carbonate from Glycerol and Benzylation of Anisole

Cited by 74 publications

References 55 publications

Pt/Al2O3 Catalyzed 1,3‐Propanediol Formation from Glycerol using Tungsten Additives

Pt/Al2O3 Catalyzed 1,3‐Propanediol Formation from Glycerol using Tungsten Additives

Facile synthesis of glycerol carbonate via glycerolysis of urea catalysed by silicotungstates impregnated into MCM-41

Understanding the surface and structural characteristics of tungsten oxide supported on tin oxide catalysts for the conversion of glycerol

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Pt/Al₂O₃ Catalyzed 1,3‐Propanediol Formation from Glycerol using Tungsten Additives

Pt/Al₂O₃ Catalyzed 1,3‐Propanediol Formation from Glycerol using Tungsten Additives