Liquid phase oxidation of benzyl alcohol to benzaldehyde over sepiolite loaded chromium oxide catalysts

Thảo, Nguyễn Tiến; Nhu, Nguyen Thi; Lin, Kuen‐Song

doi:10.1016/j.jtice.2017.11.034

Cited by 27 publications

(15 citation statements)

References 55 publications

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“…So, the cyclic conversion of Fe 3+ and Fe 2+ really occurred in benzyl alcohol oxidation. According to the reported results, the valence transformation of metal iron such as Mn III /Mn II (Yang et al, 2014;Fei et al, 2017;Gurrala et al, 2018), Co III /Co II (Zhou et al, 2015;Cordoba et al, 2017;Li et al, 2017), Cr III / Cr II (Thao et al, 2018) could catalyze the oxidation of alcohols. Especially, the transformation of Fe 3+ /Fe 2+ possessed high catalytic activity by initiating a series of electron transfer (Hu et al, 2016(Hu et al, , 2018Miao et al, 2016).…”

Section: No −mentioning

confidence: 96%

“…In the former method, the chlorinated by-products and corresponding toxic acidic would be generated, which brought troubles to the industrial application (Mal et al, 2018;Lu et al, 2019), while the vapor/liquid oxidation of toluene was also limited because of the harsh reaction conditions and low selectivity (Miao et al, 2016). Recently, BzH production with benzyl alcohol oxidation was widely adopted in industry, based on its advantages of easy-control condition and high yield (Lv et al, 2018;Thao et al, 2018). In this method, potassium permanganate (KMnO 4 ) (Mahmood et al, 1999) and dichromate (K 2 Cr 2 O 7 ) (Thottathil et al, 1986) with a strong oxidizing property are chosen as oxidants.…”

Section: Introductionmentioning

confidence: 99%

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Selective Catalytic Oxidation of Benzyl Alcohol to Benzaldehyde by Nitrates

Huang

et al. 2020

Front. Chem.

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In this paper, ferric nitrate was used to oxidize benzyl alcohol in a mild condition and demonstrated its better performance compared to HNO 3. In the reaction, the conversion rate and product selectivity could be both as high as 95% in N 2 atmosphere, while the benzaldehyde yield also reached 85% in air. Similar to Fe(NO 3) 3 •9H 2 O, the other metallic nitrates such as Al(NO 3) 3 •9H 2 O and Cu(NO 3) 2 •3H 2 O could also oxidize the benzyl alcohol with high activity. The applicability of Fe(NO 3) 3 •9H 2 O for other benzylic alcohol was also investigated, and the reaction condition was optimized at the same time. The results showed the Fe(NO 3) 3 •9H 2 O would be more conducive in oxidizing benzyl alcohol under the anaerobic condition. The experiments in N 2 or O 2 atmospheres were conducted separately to study the catalytic mechanism of Fe(NO 3) 3. The results showed the coexistence of Fe 3+ and NO − 3 will generate high activity, while either was with negligible oxidation property. The cyclic transformation of Fe 3+ and Fe 2+ provided the catalytic action to the benzyl alcohol oxidation. The role of NO − 3 was also an oxidant, by providing HNO 2 in anaerobic condition, while NO − 3 would be regenerated from NO in aerobic condition. O 2 did not oxidize the benzyl alcohol conversion directly, while it could still be beneficial to the procedure by eliminating the unwelcome NO and simultaneously reinforcing the circulation of Fe 2+ and Fe 3+ , which therefore forms a green cyclic oxidation. Hence, the benzyl alcohol oxidation was suggested in an air atmosphere for efficiency and the need of green synthesis.

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Section: No −mentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Selective Catalytic Oxidation of Benzyl Alcohol to Benzaldehyde by Nitrates

Huang

et al. 2020

Front. Chem.

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“…6 Another transition metal may replace a divalent cation. 5,7,8 For example, chromium(III) ions are already introduced to the hydroxide layers and exploited significant catalytic performance in the oxidation of primary alcohols and aromatic compounds. [8][9][10][11] The catalytic activity of the latter materials may involve in the oxidation-reduction cycle between Cr(III) and Cr(VI) ions.…”

Section: Introductionmentioning

confidence: 99%

“…5,7,8 For example, chromium(III) ions are already introduced to the hydroxide layers and exploited significant catalytic performance in the oxidation of primary alcohols and aromatic compounds. [8][9][10][11] The catalytic activity of the latter materials may involve in the oxidation-reduction cycle between Cr(III) and Cr(VI) ions. [12][13][14] The present work reports the role of dichromate moieties in the Mg-Al layered double hydroxides in the oxidation of styrene.…”

Section: Introductionmentioning

confidence: 99%

Mg-Al-Cr<sub>2</sub>O<sub>7</sub> Hydrotalcite-Like Catalysts Synthesized at Different pH Values for Styrene Oxidation

Tran¹,

Tran²,

Vu³

et al. 2020

Fine Chemical Engineering

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Dichromate anions were intercalated between two consecutive hydroxide layers of [Mg0.6Al0.4(OH)2]0.40+ via co-precipitation at different pH conditions. The physico-chemical properties of the obtained solids were examined by physical methods such as X-ray diffraction (XRD), Infrared (IR), Scanning Electron Microscopy (SEM), Brunauer-Emmett-Teller (BET) and Energy-Dispersive Spectroscopy (EDS). The experimental results indicated that the amount of dichromate anions in the catalysts varies with the pH media. Also, the morphology, structure and chemical composition of the materials depends strongly on the preparation conditions. The Mg-Al-Cr2O7 hydrotalcite-like compounds are used as heterogeneous catalysts for the styrene oxidation with H2O2 at mild conditions. The styrene conversion is about 20-50% while styrene selectivity remains rather high.

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“…Oxidation reactions are industrially attractive chemical transformations that result in oxygen‐containing products, including aldehydes, ketones, acids and epoxides that can act as key intermediates with broad utility for food, plastic, cosmetic, paint and detergents industries . As oxidation of alcohol can lead to two main products, i.e.…”

Section: Introductionmentioning

confidence: 99%

Salep as a biological source for the synthesis of biochar with utility for the catalysis

Sadjadi

Heravi

Kahangi

2019

Applied Organom Chemis

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Hydrothermal carbonization of salep as a domestic biosource was carried out to afford a biochar, BC, with exceptional catalytic activity. BC can be further magnetized by incorporation of magnetic nanoparticles to furnish a magnetic catalyst, BC‐Fe, with improved recovery and recyclability for the hydrogenation of nitroarenes in the absence of any precious metal. BC‐Fe was also applied as a catalyst support for the immobilization of Pd nanoparticles and development of an efficient, biocompatible and cost‐effective catalyst, Pd@BC‐Fe, with utility for the oxidation of benzyl alcohols under mild reaction condition in a selective manner to afford corresponding acids in high yields. The study of the recyclability of the catalyst confirmed high recyclability of Pd@BC‐Fe.

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Liquid phase oxidation of benzyl alcohol to benzaldehyde over sepiolite loaded chromium oxide catalysts

Cited by 27 publications

References 55 publications

Selective Catalytic Oxidation of Benzyl Alcohol to Benzaldehyde by Nitrates

Selective Catalytic Oxidation of Benzyl Alcohol to Benzaldehyde by Nitrates

Mg-Al-Cr<sub>2</sub>O<sub>7</sub> Hydrotalcite-Like Catalysts Synthesized at Different pH Values for Styrene Oxidation

Salep as a biological source for the synthesis of biochar with utility for the catalysis

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