Support pretreatment effect on the catalytic properties and reusability of silica-supported titania catalysts in 2,3,6-trimethylphenol oxidation with hydrogen peroxide

Torbina, Viktoriia V.; Vodyankin, Andrei A.; Ivanchikova, Irina D.; Kholdeeva, Oxana A.; Vodyankina, O. V.

doi:10.1134/s0023158415030209

Cited by 8 publications

(3 citation statements)

References 18 publications

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“…A series of heterogeneous silica-supported titania, Ti-and V-containing mesoporous mesophase catalysts as well as Ti-monosubstituted polyoxometalate catalysts, were developed by Kholdeeva's group [13][14][15][16][17][18]. To date, the most active catalyst for the oxidation of TMP with hydrogen peroxide is a heteropolyacid with vanadium and tungsten atoms in its structure, based on the tetra n-butylammonium cation TBA 4 H[γ-PW 10 V 2 O 40 ].…”

Section: Introductionmentioning

confidence: 99%

Highly Active Trifloaluminate Ionic Liquids as Recyclable Catalysts for Green Oxidation of 2,3,6-Trimethylphenol to Trimethyl-1,4-Benzoquinone

et al. 2020

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An effective method for the synthesis of 2,3,6-trimethyl-1,4-benzoquinone via the oxidation of 2,3,6-trimethylphenol as the key step in the in the preparation of vitamin E was presented. An aqueous solution of H2O2 was used as the oxidant and Lewis acidic trifloaluminate ionic liquids [emim][OTf]-Al(OTf)3, χAl(OTf)3 = 0.25 or 0.15 as catalysts. Trifloaluminate ionic liquids were synthesised by the simple reaction between 1-ethyl-3-methylimidazolium trifluoromethanesulfonate (triflate) [emim][OTf] and aluminium triflate used in sub-stoichiometric quantities. The influence of the reaction parameters on the reaction course, such as the amount and concentration of the oxidant, the amount of catalyst, the amount and the type of organic solvent, temperature, and the reaction time was investigated. Finally, 2,3,6-trimethyl-1,4-benzoquinone was obtained in high selectivity (99%) and high 2,3,6-trimethylphenol conversion (84%) at 70 °C after 2 h of oxidation using a 4-fold excess of 60% aqueous H2O2 and acetic acid as the solvent. The catalytic performance of trifloaluminate ionic liquids supported on multiwalled carbon nanotubes (loading of active phase: 9.1 wt.%) was also demonstrated. The heterogeneous ionic liquids not only retained their activity compared to the homogenous counterparts, but also proved to be a highly recyclable catalysts.

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Section: Introductionmentioning

confidence: 99%

Highly Active Trifloaluminate Ionic Liquids as Recyclable Catalysts for Green Oxidation of 2,3,6-Trimethylphenol to Trimethyl-1,4-Benzoquinone

et al. 2020

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“…The synthesis of TiO 2 –SiO 2 system has been discussed in a number of studies, in which TEOS or SiO 2 ‐aerogel was used as a silicon component. Binary systems in these studies are synthesized in two ways.…”

Section: Introductionmentioning

confidence: 99%

Hybrid composites based on technical cellulose from rice husk

Shapovalova

Вураско

Petrov

et al. 2017

J of Applied Polymer Sci

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We introduced the preparation of hybrid composites using technical cellulose as a matrix material from rice husks with a natural SiO 2 content from 0% to 19.4%. In this work, the physicochemical characteristics of the resulting hybrid composites have been investigated. The presence of SiAOAC chemical bonds in the resulting hybrid composites was determined by infrared spectroscopy. Microscopic analysis showed the complete removal of the mineral component and lignin from the cell wall of the rice husk fibers. This allows obtaining of an expanded surface of the fibers (101.7 m 2 /g) with uniform distribution of the TiO 2 aggregates. It could be shown that with content increasing of natural silicon dioxide in the hybrid composite the decomposition rate of H 2 O 2 also increases.

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“…More than 1000 substances have been tested [2]. Advanced oxidation using TiO 2 offer potential treatment opportunities for: tertiary treatment of municipal wastewater [3,4], for removal of endocrine disrupting chemicals [5][6][7] and disinfection [8,9], especially effluents containing pathogens resistant to chlorination [10][11][12][13][14][15][16]; treatment of hazardous effluents from hospitals [17,18]; industrial effluents from pulp and paper [19][20][21][22], dairy manufacturing [23], textile dyeing [24][25][26][27][28][29][30][31], agricultural oil mills and distilleries [32,33], and pharmaceutical industry [34][35][36][37]; wastewater effluents containing phenols [38][39][40][41] and chlorophenols [42,43], herbicides and pesticides [44][45][46], ammonia [4...…”

Section: Introductionmentioning

confidence: 99%

TiO2 Solar Photocatalytic Reactor Systems: Selection of Reactor Design for Scale-up and Commercialization—Analytical Review

2016

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For the last four decades, viability of photocatalytic degradation of organic compounds in water streams has been demonstrated. Different configurations for solar TiO 2 photocatalytic reactors have been used, however pilot and demonstration plants are still countable. Degradation efficiency reported as a function of treatment time does not answer the question: which of these reactor configurations is the most suitable for photocatalytic process and optimum for scale-up and commercialization? Degradation efficiency expressed as a function of the reactor throughput and ease of catalyst removal from treated effluent are used for comparing performance of different reactor configurations to select the optimum for scale-up. Comparison included parabolic trough, flat plate, double skin sheet, shallow ponds, shallow tanks, thin-film fixed-bed, thin film cascade, step, compound parabolic concentrators, fountain, slurry bubble column, pebble bed and packed bed reactors. Degradation efficiency as a function of system throughput is a powerful indicator for comparing the performance of photocatalytic reactors of different types and geometries, at different development scales. Shallow ponds, shallow tanks and fountain reactors have the potential of meeting all the process requirements and a relatively high throughput are suitable for developing into continuous industrial-scale treatment units given that an efficient immobilized or supported photocatalyst is used.

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Support pretreatment effect on the catalytic properties and reusability of silica-supported titania catalysts in 2,3,6-trimethylphenol oxidation with hydrogen peroxide

Cited by 8 publications

References 18 publications

Highly Active Trifloaluminate Ionic Liquids as Recyclable Catalysts for Green Oxidation of 2,3,6-Trimethylphenol to Trimethyl-1,4-Benzoquinone

Highly Active Trifloaluminate Ionic Liquids as Recyclable Catalysts for Green Oxidation of 2,3,6-Trimethylphenol to Trimethyl-1,4-Benzoquinone

Hybrid composites based on technical cellulose from rice husk

TiO2 Solar Photocatalytic Reactor Systems: Selection of Reactor Design for Scale-up and Commercialization—Analytical Review

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