Biodiesel production by acid catalysis with heteropolyacids supported on activated carbon fibers

Alcañiz-Monge, Juan; Trautwein, Guido; Marco-Lozar, J.P.

doi:10.1016/j.apcata.2013.09.006

Cited by 51 publications

(24 citation statements)

References 35 publications

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“…,. A strategy commonly explored is supporting the Keggin HPAs on a solid support with high surface area . Although there are several examples describing the successfully use of the solid‐supported HPAs, the leaching problems and the laborious synthesis are some drawbacks of these supported catalysts …”

Section: Introductionmentioning

confidence: 99%

K5PW11NiO39‐catalyzed oxidation of benzyl alcohol with hydrogen peroxide

et al. 2019

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In this work, we synthesized a series of metal-substituted potassium heteropolyacid salts and investigated its catalytic activity on oxidation of benzyl alcohol with H 2 O 2 under homogeneous (CH 3 CN) and biphasic (toluene/water) conditions. The Keggin heteropolyacids were converted to lacunar salts (i. e., K 7 PW 11 O 39 ; K 7 PMo 11 O 39 and K 8 SiW 11 O 39 ), which had their vacancies filled with metal cations (i. e., Al 3 + , Fe 3 + , Co 2 + , Cu 2 + , and Ni 2 + ), generating the metal-substituted salts. The K 5 PW 11 NiO 39 proved to be the most efficient catalyst. The synergic effect raised between the PW 11 O 39 7À anion and Ni 2 + cation improved the redox properties and the activity of the catalyst. The K 5 PW 11 NiO 39 catalyst was able to promote the benzyl alcohol oxidation with hydrogen peroxide in biphasic conditions in the absence of phase transfer catalyst. Benzaldehyde and benzoic acid were the main products. The effects of main reaction parameters were assessed. The K 5 PW 11 NiO 39 catalyst was successfully recovered and reused without losing activity.

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Section: Introductionmentioning

confidence: 99%

K5PW11NiO39‐catalyzed oxidation of benzyl alcohol with hydrogen peroxide

et al. 2019

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“…Long et al performed a study on H 3 PW 12 O 40 supported on coconut activated carbon to oxidize MX to IPA. Alcañiz‐Monge et al catalyzed the esterification with HPA supported on activated carbon fibers. The activated carbon possesses a complex porous structure and abundant nitrogen and oxygen‐containing functional groups.…”

Section: Introductionmentioning

confidence: 99%

Production of isophthalic acid from M‐Xylene catalyzed by Co(II) and HPW@C modified with ZnCl₂ solution

et al. 2019

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The production of isophthalic acid (IPA) from the oxidation of m-xylene (MX) with air can be sped up by Co(II) and phosphotungstic acid (HPW) loaded on activated carbon. In this paper, activated carbon is modified with a ZnCl 2 solution to improve the catalytic performance of the HPW@C catalyst. The experiments indicate that the optimum modification condition is the carbon immersed in a 0.10 mol L À1 ZnCl 2 solution for 6 h at the temperature of 40 8C followed by being carbonized at 600 8C for 4 h. The characterization proves that the ZnCl 2 modification leads to the increase of surface area and acidic groups on the activated carbon. The MX conversion catalyzed by the HPW@C prepared from the carbon modified is 7.0 % over that by the HPW@C from the original carbon and the IPA produced by the modified sample is 78.9 % over that produced by the original one.

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“…Althought he surface area of Cs2.5 is high ( % 125 m 2 g À1 ), it is necessary to support Cs2.5 on mesoporous materials that have al arge surface area ( % 600-1000 m 2 g À1 ), high thermal stabilitya nd tunable pore structure geometries. Silica, [20,21] zeolites, [7,22] titania, [23] zirconia, [15,24] alumina, [25] carbon [26,27] and clay [28] are supports that have been applied widely for various reactions. Silica is considered to be an appropriate support for heteropoly compounds as it interacts weakly with Cs2.5 and has suitable pore size to allow the interaction of large molecules with the active sites.…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient Glycerol Acetalization over Supported Heteropoly Acid Catalysts

et al. 2018

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The acetalization of glycerol with acetone to yield solketal was catalyzed by Cs2.5H0.5PW12O40 (Cs2.5) supported on mesoporous silica under mild conditions. It gave a high glycerol conversion and selectivity to the targeted product even at room temperature (23 °C). We studied the use of both bulk and supported Cs2.5 as catalysts in another highly efficient glycerol acetalization reaction with paraformaldehyde, which gave much higher activity than with formaldehyde solution. For the reaction with acetone, the supported Cs2.5 showed a higher activity than the bulk material because of the high surface area of the mesoporous support. Interestingly, the supported Cs2.5 gave a lower conversion than the bulk for the reaction with paraformaldehyde. This is probably because of the high viscosity of the reaction system with the solid reagent paraformaldehyde. Overall, there is a complex relationship between catalyst, reaction conditions, which include the molar ratio of reactants and temperature, reaction mechanism and thermodynamics that affects the achieved activity and byproduct formation. A discussion about these interactions is included for each reaction.

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Biodiesel production by acid catalysis with heteropolyacids supported on activated carbon fibers

Cited by 51 publications

References 35 publications

K5PW11NiO39‐catalyzed oxidation of benzyl alcohol with hydrogen peroxide

K5PW11NiO39‐catalyzed oxidation of benzyl alcohol with hydrogen peroxide

Production of isophthalic acid from M‐Xylene catalyzed by Co(II) and HPW@C modified with ZnCl₂ solution

Highly Efficient Glycerol Acetalization over Supported Heteropoly Acid Catalysts

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Biodiesel production by acid catalysis with heteropolyacids supported on activated carbon fibers

Cited by 51 publications

References 35 publications

K5PW11NiO39‐catalyzed oxidation of benzyl alcohol with hydrogen peroxide

K5PW11NiO39‐catalyzed oxidation of benzyl alcohol with hydrogen peroxide

Production of isophthalic acid from M‐Xylene catalyzed by Co(II) and HPW@C modified with ZnCl2 solution

Highly Efficient Glycerol Acetalization over Supported Heteropoly Acid Catalysts

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Production of isophthalic acid from M‐Xylene catalyzed by Co(II) and HPW@C modified with ZnCl₂ solution