Polyoxometalate-MgF<sub>2</sub>hybrids as heterogeneous solid acid catalysts for efficient biodiesel production

Yang, Kangkang; Huang, Shan; Pan, Hongge; Zhang, Heng; Liu, Xiaofang; Yang, Song

doi:10.1039/c7ra06080g

Cited by 12 publications

(6 citation statements)

References 66 publications

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“…A reação sem catalisador apresentou taxa de conversão de 5,9 % de oleato de metila, sugerindo que esta ocorre lentamente e que a atividade catalítica é atribuída à fraca acidez do ácido oleico, que provavelmente atua como catalisador e reagente. 43 Resultado semelhante foi observado para a peneira molecular pura MCM-41, com taxa de conversão de 9,9 %, este é devido à baixa atividade catalítica promovida pela ausência de sítios ativos. 45 A reação de conversão de oleato de metila foi realizada com 5 % (m/m) de catalisador HPW30 e ácido oleico/metanol (razão molar 1:7; 1:10; 1:14; 1:21 e 1:30, respectivamente), a 65 °C, por 5 h. A esterificação é uma reação reversível, consequentemente o uso de maior concentração de metanol na razão molar de ácido/álcool resulta em uma maior taxa de conversão do oleato de metila.…”

Section: Resultsunclassified

MCM-41 Derived from Freshwater Sponge Silica as Support for HPW Applied in the Esterification of Oleic Acid

Lacerda

Couceiro

2019

Rev. Virtual Quim.

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The MCM-41 was synthesized from freshwater sponge (Metania kiliani) by the hydrothermal process. Aqueous impregnation of commercial 12-tungstophosphoric acid (H3PW12O40; HPW) in 5, 10, 15, 20 and 30 %, respectively, in MCM-41 led to the formation of new catalysts preserving hexagonal mesoporous characteristics and dispersed homogeneously on the surface and in the interior of the MCM-41 structure. The characterization of the catalysts was done by the analytical techniques: XRD, FTIR and SEM. For the study purposes, the catalysts were run under the conditions of oleic acid/methanol of molar ratio (1:7), temperature (65 °C) and time (5 h) and 5 % ( / ) catalyst. Quantification of biodiesel converted in the esterification process of oleic acid was determined by titration with NaOH. Among the various catalysts, the best performance was HPW30 (MCM-41 + HPW 30%) in 75.1% methyl oleate. ResumoA MCM-41 foi sintetizada a partir de esponja de água doce (Metania kiliani) pelo processo hidrotermal. A impregnação aquosa de ácido 12-tungstofosfórico comercial (H3PW12O40; HPW) em 5, 10, 15, 20 e 30 %, respectivamente, em MCM-41 conduziu a formação de novos catalisadores preservando características mesoporosas hexagonais e dispersa homogeneamente na superfície e no interior dos poros da estrutura MCM-41. A caracterização dos catalisadores foi feita pelas técnicas analíticas: DRX, IVTF e MEV. Para fins de estudo foram realizados ensaios com os catalisadores nas condições de razão molar ácido oleico/metanol (1:7), temperatura (65 °C) e tempo (5 h) e 5 %(m/m) de catalisador. A quantificação de biodiesel convertido no processo esterificação do ácido oleico foi determinada por titulação com NaOH. Entre os diversos catalisadores, o de melhor desempenho foi HPW30 (MCM-41 + HPW 30 %) com taxa de conversão de 75,1 % de oleato de metila. Palavras-chave:Esponja; MCM-41; ácido 12-tungstofosfórico (HPW); biodiesel.* Universidade Federal do Amazonas, Av. Rodrigo Otávio 6.200, Coroado, CEP 69077-000, Manaus-AM,

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Section: Resultsunclassified

MCM-41 Derived from Freshwater Sponge Silica as Support for HPW Applied in the Esterification of Oleic Acid

Lacerda

Couceiro

2019

Rev. Virtual Quim.

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“…26 The Mg 20 F 39 TPA-1.0 hybrid shows considerable catalytic activity and gives a methyl ester yield of 93 ± 0.7%. 27 For H 3 PW 12 O 40 / Ta 2 O 5 -10.8, 51.4% of methyl palmitate was obtained with model feedstock at a very high molar ratio, and a decrease in activity was observed after the second run. 28 With Ta 2 O 5 /SiO 2 − [H 3 PW 12 O 40 /Me] for soybean oil with 20% myristic acid, the yield of methyl linolenate, methyl palmitate, and methyl oleate reached 81.2%, 65.9%, and 53.9% after 24 h using a very high methanol to oil molar ratio.…”

Section: Industrial and Engineering Chemistry Researchmentioning

confidence: 92%

Meso-Structured HPW-MAS-7 and HPW-MAS-9 Composite Catalysts for Biodiesel Synthesis from Unrefined Green Seed Canola Oil

Kurhade

Zhu

Dalai

2019

Ind. Eng. Chem. Res.

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H3PW12O40-MAS-7 and H3PW12O40-MAS-9 composite catalysts exhibiting different structural orderings were assembled from zeolite beta and ZSM-5 precursors by a one-pot template-assisted self-assembly mechanism. Characterization results suggest that H3PW12O40 was encapsulated into the mesoporous framework of the aluminosilicates without alteration of mesoporosity of the composites. The sequential introduction of H3PW12O40 during the synthesis of MAS-7 and MAS-9 affected the surface morphologies. The textural characteristics of the composites were improved owing to the introduction of HPW after the addition of an inorganic precursor to the template leading to a material with a high BET surface area. As novel heterogeneous solid acid catalysts, the activity of the composites was determined for the biodiesel synthesis from the unrefined green seed canola oil, giving 95.4 ± 1.4 wt % methyl ester in 10 h at 180 °C with 5.5 wt % of catalyst and a 15.5:1 methanol to oil molar ratio. The recyclability of the composites is evaluated through four consecutive reactions.

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“…It is worth noting that effective catalysis is usually demanded to generate monomers, to facilitate selective polymerizations and to enable recycling or upcycling of waste materials [13][14][15]. e increasing demands of biofuels and fuel additives, among which biodiesel has caused a considerable surplus of glycerol to the market that will create new threats in terms of their sustainable exploitation [16][17][18][19]. Stoichiometrically (Scheme 1), for the transesterification of triglycerides with methanol into biodiesel and glycerol, each tonne of biodiesel along with 100 kg of by-product crude glycerol are simultaneously generated [20,21].…”

Section: Introductionmentioning

confidence: 99%

Progress of Catalytic Valorization of Bio-Glycerol with Urea into Glycerol Carbonate as a Monomer for Polymeric Materials

Zhang

Wang

et al. 2020

Advances in Polymer Technology

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Versatile polymers with highly adjustable characteristics and a broad range of applications are possibly developed owing to the contemporary industrial polymerization techniques. However, industrial production of large amounts of chemicals and polymers heavily depends on petroleum resources which are dwindling and unsustainable. Of particular interest is to utilize sustainable and green resources for the manufacture of polymeric materials. The efficient transformation of bio-glycerol to the relevant functional derivatives are being widely investigated owing to the increasing demand for enhancing the value of glycerol manufactured by biodiesel and oleochemical industries. With respect to glycerol-based polymer chemistry and technology, considering the economy and environmental benefits, using effective catalysts for the selective transformation of bio-glycerol and urea into glycerol carbonate (GC) as a polymer monomer is of great significance. In this review, recent studies on GC synthesis involving the catalysts such as zinc, magnesium, tungsten, ionic liquid-based catalysts, reaction conditions, and possible pathways are primarily described. Some critical issues and challenges with respect to the rational development of heterogeneous catalytic materials like well-balanced acid-base sites are also illustrated.

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Polyoxometalate-MgF₂hybrids as heterogeneous solid acid catalysts for efficient biodiesel production

Cited by 12 publications

References 66 publications

MCM-41 Derived from Freshwater Sponge Silica as Support for HPW Applied in the Esterification of Oleic Acid

MCM-41 Derived from Freshwater Sponge Silica as Support for HPW Applied in the Esterification of Oleic Acid

Meso-Structured HPW-MAS-7 and HPW-MAS-9 Composite Catalysts for Biodiesel Synthesis from Unrefined Green Seed Canola Oil

Progress of Catalytic Valorization of Bio-Glycerol with Urea into Glycerol Carbonate as a Monomer for Polymeric Materials

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Polyoxometalate-MgF2hybrids as heterogeneous solid acid catalysts for efficient biodiesel production

Cited by 12 publications

References 66 publications

MCM-41 Derived from Freshwater Sponge Silica as Support for HPW Applied in the Esterification of Oleic Acid

MCM-41 Derived from Freshwater Sponge Silica as Support for HPW Applied in the Esterification of Oleic Acid

Meso-Structured HPW-MAS-7 and HPW-MAS-9 Composite Catalysts for Biodiesel Synthesis from Unrefined Green Seed Canola Oil

Progress of Catalytic Valorization of Bio-Glycerol with Urea into Glycerol Carbonate as a Monomer for Polymeric Materials

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Polyoxometalate-MgF₂hybrids as heterogeneous solid acid catalysts for efficient biodiesel production