Synthesis and characterization of 12-phosphotungstic acid supported on BEA zeolite

Jović, Aleksandar; Bajuk–Bogdanović, Danica; Vasiljević, Bojana Nedić; Milojević-Rakić, Maja; Krajišnik, Danina; Dondur, V.; Popa, Alexandru; Uskoković‐Marković, Snežana; Holclajtner-Antunović, Ivanka

doi:10.1016/j.matchemphys.2016.11.015

Cited by 24 publications

(12 citation statements)

References 24 publications

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“…However, these catalysts have a high loading of HPW. This may be ascribed to the fact that HPW species easily agglomerate, which is an obstacle to the reduction of HPW loading. The dispersion of HPW on the support can be improved using ultrasonic treatment .…”

Section: Introductionmentioning

confidence: 99%

“…This may be ascribed to the fact that HPW species easily agglomerate, which is an obstacle to the reduction of HPW loading. The dispersion of HPW on the support can be improved using ultrasonic treatment . Therefore, it is necessary to develop a novel support and new preparation methods for improving the dispersion and reducing the loading content of HPW on the support.…”

Section: Introductionmentioning

confidence: 99%

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Heteropolyacid Supported on Nitrogen-doped Onion-Like Carbon as Catalyst for Oxidative Desulfurization

et al. 2017

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In order to improve the dispersion and reduce the loading content of phosphotungstic acid (H 3 PW 12 O 40 , HPW) on a support, the HPW was immobilized on the surface of nitrogendoped onion-like carbon (NOLC) with the assistance of ultrasonication. The obtained HPW/NOLC catalysts with an HPW loading of 5 %-15 % were characterized using various techniques. The results show that the HPW active component was well-dispersed on the NOLC surface. Under the optimum reaction conditions, a complete conversion of dibenzothiophene (DBT) could be achieved using the 10 % HPW/NOLC catalyst. This excellent catalytic effect may be ascribed to the good dispersion of HPW on the NOLC surface. Moreover, it was inferred that the nitrogen/oxygen functional groups strengthened the connections between HPW and the NOLC support, which is beneficial for improving the dispersion of HPW on the NOLC surface.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Heteropolyacid Supported on Nitrogen-doped Onion-Like Carbon as Catalyst for Oxidative Desulfurization

et al. 2017

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“…If the aim is to combine two excellent catalytic materials, can enhanced catalytic performance be expected? Systematic upgrade of zeolites with organic and inorganic active phase molecules and structures has proved to be a valuable approach for manufacturing upgraded materials for various environmental applications (Milojević-Rakić et al 2013Jović et al 2017Jović et al , 2018Bajuk-Bogdanović et al 2017;Jevremović et al 2019Jevremović et al , 2020. MFI zeotype excels by far in this catalysts search, but the present study aims to show that BEA zeotype (β) with larger pores and higher acid stability may be a better choice for ethanol dehydration.…”

Section: Introductionmentioning

confidence: 99%

“…There is, however, a question of catalyst stability at a given reaction temperature, with partial or substantial solubility, which is often noted as an obstacle for heteropolyacids and related compounds applications (Gallo et al 2014). Many aluminosilicate compounds are assessed as commercial-grade catalysts for dehydration reaction, among which zeolites are often part of the research targets (Madeira et al 2009;Ramasamy and Wang 2014;Jović et al 2017;Clemente et al 2019). If the aim is to combine two excellent catalytic materials, can enhanced catalytic performance be expected?…”

Section: Introductionmentioning

confidence: 99%

The impact of preparation route on the performance of silver dodecatungstophosphate/β zeolite catalysts in the ethylene production

et al. 2021

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Heteropolyacids and their salts comprise catalytic centers for the production of ethylene, one of the most important constituents in the chemical industry. The paper emphasizes different synthesis routes of hybrid materials consisting of dodecatungstophosphoric acid silver salt (AgPW) and β zeolite-stepwise wet impregnation, silver-exchange in β zeolite, and dry mixing of precursors. Composite preparation procedures induced minor effects on the weak acid sites, while strong acid sites were increased significantly. β/AgPW composites prepared by two-steps wet impregnation and ion-exchange procedures have strong acid sites content and total acidity higher in comparison to the pure AgPW salt and β zeolite. This is a result of precursors synergetic effect-cumulative strong acidic sites are generated in the presence of well-dispersed Keggin ions on the zeolite network. Composite samples with a higher content of strong acid centers exhibit higher conversion in the ethanol dehydration reaction, i.e., the ion-exchanged βAgPW sample has attained a conversion over 81%, while the wet-impregnated sample has a significant 86%. The distribution and presence of AgPW active phase are found to be crucial for both stable conversion and high selectivity results in ethylene production from ethanol, which is regarded as one of the most significant processes in environmental and sustainable industrial chemistry.

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“…In addition, its surface area is relatively low (<10 m 2 g −1 ). Several kinds of support materials have been employed for this purpose, including activated carbon [16], zeolite [17], titania [18], and mesoporous silica [19]. Among these support materials, mesoporous silicas such as SBA-15 are especially suitable for being used as a support for HPW due to their high surface area, proper pore size, and high thermal stability [20].…”

Section: Introductionmentioning

confidence: 99%

Effect of Surface Modifications of SBA-15 with Aminosilanes and 12-Tungstophosphoric Acid on Catalytic Properties in Environmentally Friendly Esterification of Glycerol with Oleic Acid to Produce Monoolein

et al. 2018

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A series of protonated amino-functionalized SBA-15 materials was synthesized and tested as heterogeneous catalysts for the esterification of glycerol with oleic acid to produce monoolein. Mesoporous SBA-15 (S) was functionalized with three different aminosilanes: 3-aminopropyltriethoxysilane (N 1 ); [3-(2-amino-ethylamino)propyltrimethoxysilane] (N 2 ); and (3-trimethoxysilylpropyl) diethylenetriamine (N 3 ), before being impregnated with 40 wt % 12-tungstophosphoric acid (HPW). The resulting nanocatalysts (S-N x -HPW) were characterized by X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), N 2 adsorption-desorption, SEM equipped with energy dispersive X-ray spectroscopy (SEM-EDX), transmission electron microscopy (TEM), and elemental analysis techniques. The presence of components of the nanocatalysts and the preservation of the hexagonal structure of SBA-15 were confirmed. Using different functionalizing agents considerably affected the textural properties and acidity of the synthesized nanocatalysts, which helped to improve the catalytic performance. In particular, S-N 2 -HPW was more active and selective than other catalysts in this study, as well as than a number of other commercial acid catalysts, with 95.0% oleic acid conversion and 60.9% monoolein selectivity being obtained after five h of reaction at 160 • C using 2.5 wt % of catalyst loading and glycerol/oleic acid molar ratio of 4:1. Aminosilane functionalization also helped to increase the reusability of the catalysts to at least six cycles without considerable loss of activity through strong electrostatic interactions between HPW anions and the protonated amino-functionalized SBA-15 materials.

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Synthesis and characterization of 12-phosphotungstic acid supported on BEA zeolite

Cited by 24 publications

References 24 publications

Heteropolyacid Supported on Nitrogen-doped Onion-Like Carbon as Catalyst for Oxidative Desulfurization

Heteropolyacid Supported on Nitrogen-doped Onion-Like Carbon as Catalyst for Oxidative Desulfurization

The impact of preparation route on the performance of silver dodecatungstophosphate/β zeolite catalysts in the ethylene production

Effect of Surface Modifications of SBA-15 with Aminosilanes and 12-Tungstophosphoric Acid on Catalytic Properties in Environmentally Friendly Esterification of Glycerol with Oleic Acid to Produce Monoolein

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