Mesoporous tantalum phosphate as acidic catalyst for the methanolysis of sunflower oil

Jiménez‐Morales, Ignacio; Santamaría‐González, J.; Maireles‐Torres, Pedro; Jiménez‐López, Antonio

doi:10.1016/j.apcatb.2012.04.023

Cited by 24 publications

(11 citation statements)

References 45 publications

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“…For the Ta 2 O 5 -300 sample, a strong Raman band appeared at 660 cm À1 , which was characteristic for Ta-O stretching vibration mode. 26 Similar features were also observed in the TaOPO 4 -m samples. Besides, a distinct band centered at 1013 cm À1 , which was attributed to the P-O asymmetric stretching vibrations of phosphate species, can be found for all TaOPO 4 -m samples, suggesting that Ta-O-P bond was formed in mesoporous TaOPO 4 samples.…”

Section: Physicochemical Propertiessupporting

confidence: 71%

“…Besides, a distinct band centered at 1013 cm À1 , which was attributed to the P-O asymmetric stretching vibrations of phosphate species, can be found for all TaOPO 4 -m samples, suggesting that Ta-O-P bond was formed in mesoporous TaOPO 4 samples. 26 The band observed between 200 and 400 cm À1 can be assigned to O-Ta-O bending modes for the Ta 2 O 5 -300 sample and to various O-P-O and O-Ta-O bending modes for TaOPO 4 -m samples. 34 Furthermore, with increasing m, the area ratio of the peak assigned to P-O to the peak assigned to Ta-O increased.…”

Section: Physicochemical Propertiesmentioning

confidence: 93%

“…25,26 In a typical synthesis procedure, 0.012 mol tantalum penta-ethoxide (Ta(OC 2 H 5 ) 5 , Ltd) solution in deionized water was added dropwise (0.5 mL min À1 ) to the mixture under vigorous stirring at 35 C and stirred for another 60 min. The nal mixture was transferred to a 25 mL Teon lined autoclave and annealed at 130 C for 24 h. The obtained precipitates were washed with deionized water for 3 times and then anhydrous ethanol for 3 times.…”

Section: Sample Preparationmentioning

confidence: 99%

“…Thus, various mesoporous niobium phosphate and mesoporous tantalum phosphate were prepared and used as catalysts for many reactions. [25][26][27][28][29] Mesoporous tantalum phosphate is known as a strongly acidic solid catalyst with high surface area and large pore size, but its potential for the liquid-phase dehydration of xylose has been rarely explored.…”

Section: Introductionmentioning

confidence: 99%

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Mesoporous tantalum phosphates: preparation, acidity and catalytic performance for xylose dehydration to produce furfural

et al. 2016

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Mesoporous tantalum phosphates (TaOPO 4 -m) with varying P/Ta molar ratios (m ¼ 0.41-0.89) were prepared, comprehensively characterized by ICP-AES, N 2 physisorption, small-angle XRD, TEM, Raman, FT-IR, NH 3 -TPD and IR of pyridine adsorption and employed to catalyze the dehydration of xylose to produce furfural in a biphasic batch reactor. The physicochemical properties of these TaOPO 4 -m samples were affected significantly by variation of m. More ordered mesopores were formed in the sample with a higher m. On the other hand, the density of acidity decreased but the ratio of Brønsted acidity to Lewis acidity (B/L) increased with the increase in m. TaOPO 4 -0.84, which showed adequate mesoporosity and a high B/L ratio, was identified as the best performing catalyst among these TaOPO 4m catalysts in terms of high furfural selectivity (ca. 72 mol%). Correlating the catalyst performance with its acid property showed that the xylose consumption rate decreased with the increasing B/L ratio, while furfural selectivity showed a volcano-type dependence on the B/L ratio. Besides, the huge decrease in the furfural selectivity after poisoning the Brønsted acid sites by adding 2,6-dimethyl pyridine revealed a kind of Brønsted acid catalysis for selective furfural production. Fig. 7 Performance of the TaOPO 4 -m catalysts with different molar P/Ta ratio m by the time courses of (A) xylose conversion, (B) furfural selectivity: m ¼ 0.41 (-), m ¼ 0.61 (B), m ¼ 0.75 (:), m ¼ 0.84 (A), and m ¼ 0.89 (P).This journal is

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Section: Physicochemical Propertiessupporting

confidence: 71%

Section: Physicochemical Propertiesmentioning

confidence: 93%

Section: Sample Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Mesoporous tantalum phosphates: preparation, acidity and catalytic performance for xylose dehydration to produce furfural

et al. 2016

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“…Recently phosphates of Nb [20], Ta [21], Ti [22] and Zr [23] have been synthesized and used as acid catalysts for dehydration of biomass and biomass derived carbohydrates into HMF. Among these phosphates, titanium phosphate (TiP) has received greater attention because of its unique catalytic properties, such as Lewis acidity with tunable acid density, and high life span due to thermal and chemical stability.…”

Section: Introductionmentioning

confidence: 99%

Titanium hydrogenphosphate: An efficient dual acidic catalyst for 5-hydroxymethylfurfural (HMF) production

Alam

Singh

et al. 2014

Applied Catalysis A: General

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Dual Brønsted and Lewis acidity of solid acid catalysts enhances selective production of 5hydroxymethylfurfural (HMF). This report describes a simple template-free synthetic approach for the preparation of titanium hydrogenphosphate (TiHP) material containing Lewis and Brønsted acid sites. As-synthesized material has been thoroughly analyzed by several analytical methods for elucidating its structural properties, including determination of the presence of Brønsted acidic phosphate group and measurement of total acid density. NH 3-TPD data reveals high surface acidity (1.43 mmol g −1) of the TiHP, which is indeed reflects to its catalytic effectiveness for the conversion of fructose, giving 55% HMF in biphasic solvent. Glucose conversion gives better yield (35%) when the reaction was carried out in a larger reactor (2 L Parr reactor), which might be due to better mechanical stirring and hence higher mixing efficiency of the reactants. Brønsted acid sites in the catalyst facilitated the formation of furan ring opening product, levulinic acid, at higher temperatures. The catalyst shows excellent recyclability and the recovered catalyst after the 3 rd cycles retained XRD and TGA characteristics.

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Peroxotantalate‐Based Ionic Liquid Catalyzed Epoxidation of Allylic Alcohols with Hydrogen Peroxide

Chen

Kong

et al. 2017

Chemistry A European J

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The efficient and environmentally benign epoxidation of allylic alcohols has been attained by using new kinds of monomeric peroxotantalate anion-functionalized ionic liquids (ILs=[P ] [Ta(O) (η-O )], P =quaternary phosphonium cation, n=4, 8, and 14), which have been developed and their structures determined accordingly. This work revealed the parent anions of the ILs underwent structural transformation in the presence of H O . The formed active species exhibited excellent catalytic activity, with a turnover frequency for [P ] [Ta(O) (η-O )] of up to 285 h , and satisfactory recyclability in the epoxidation of various allylic alcohols under very mild conditions by using only one equivalent of hydrogen peroxide as an oxidant. NMR studies showed the reaction was facilitated through a hydrogen-bonding mechanism, in which the peroxo group (O-O) of the peroxotantalate anion served as the hydrogen-bond acceptor and hydroxyl group in the allylic alcohols served as the hydrogen-bond donor. This work demonstrates that simple monomeric peroxotantalates can catalyze epoxidation of allylic alcohols efficiently.

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Mesoporous tantalum phosphate as acidic catalyst for the methanolysis of sunflower oil

Cited by 24 publications

References 45 publications

Mesoporous tantalum phosphates: preparation, acidity and catalytic performance for xylose dehydration to produce furfural

Mesoporous tantalum phosphates: preparation, acidity and catalytic performance for xylose dehydration to produce furfural

Titanium hydrogenphosphate: An efficient dual acidic catalyst for 5-hydroxymethylfurfural (HMF) production

Peroxotantalate‐Based Ionic Liquid Catalyzed Epoxidation of Allylic Alcohols with Hydrogen Peroxide

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