Promoting role of bismuth on carbon nanotube supported platinum catalysts in aqueous phase aerobic oxidation of benzyl alcohol

Zhou, Chunmei; Guo, Zhen; Dai, Yihu; Jia, Xiaoxu; Li, Yuhang; Yang, Yanhui

doi:10.1016/j.apcatb.2015.07.048

Cited by 68 publications

(45 citation statements)

References 54 publications

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“…Some of the transformations are (i) partial oxidation to yield BzH, benzoic acid and benzyl benzoate, (ii) disproportionation to form BzH, toluene and water, (iii) dehydration to form dibenzyl ether and (iv) self‐condensation (benzylation) to form anthracene and stilbene ,. There were extensive reports on partial oxidation of alcohols to aldehydes in batch reactors using different catalysts . While liquid phase batch reactions require long hours to reach steady state, some of the work was focused on green approaches such as solvent‐free processes;,, utilization of green oxidants like air/O 2 ;, and also through photocatalysis .…”

Section: Introductionmentioning

confidence: 99%

Spinel‐Type Mixed Oxides for Stable and Selective Partial Oxidation of Benzyl Alcohol

et al. 2018

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Benzaldehyde is an important chemical intermediate, which need to be prepared through an eco‐friendly process. Manganese oxides are active as catalysts for its preparation through partial oxidation of benzyl alcohol. In this study, Cu, Co and Mn containing spinel based mixed oxides (CuxMn3−xO4) were prepared and tested for partial oxidation of benzyl alcohol to get benzaldehyde with high selectivity. The catalytic activity strongly depended on chemical composition, acid‐base properties and oxygen uptake. The influence of chemical composition, reaction temperature, oxygen partial pressure and the weight hourly space velocity (WHSV) were investigated to optimize benzaldehyde yield and to stabilize the catalyst activity. A high benzaldehyde selectivity of 98%, accompanied with benzyl alcohol conversion of 84.5% was obtained over Cu0.25Mn2.75O4 catalyst at 300 °C. It was evident from temperature programmed desorption (TPD) of CO2 that this catalyst was found to have optimum basicity and high oxygen uptake, thus imparting high activity and stability. Activity and catalyst life could be attributed to appropriate acid‐base properties.

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Section: Introductionmentioning

confidence: 99%

Spinel‐Type Mixed Oxides for Stable and Selective Partial Oxidation of Benzyl Alcohol

et al. 2018

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“…It is generally known that a suitable catalyst plays an essential role in these oxidation reactions. Various chemical reagents used as the catalysts have been applied for this transformation efficiently and selectively, including inorganic oxidants, supported metals, copper(II) complexes, bipyridine–heteropolyacid hybrid, Pd(OAc) 2 /ionic liquid, heteropoly acid/ionic copolymer, Au 25 (SPh‐ p NH 2 ) 17 /SBA‐15, CoMgAl hydrotalcites, and a photocatalyst . From the viewpoint of green chemistry, a promising oxidation process should take place at atmospheric pressure under solvent‐free and base‐free conditions.…”

Section: Introductionmentioning

confidence: 99%

Efficient and Reusable Sn(II)‐containing Imidazolium‐based Ionic Liquid as a Catalyst for the Oxidation of Benzyl Alcohol

Wang

Fang

et al. 2016

J Chinese Chemical Soc

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A simple and efficient catalytic system [BBIM]Br–SnCl2 for the oxidation of benzyl alcohol using hydrogen peroxide as the oxidant has been developed. Reaction conditions such as the catalyst dose, the solvents, reaction temperature, reaction time, and the amount of hydrogen peroxide were investigated. The optimum reaction conditions identified were 0.11 g of catalyst, no solvent, 65°C, 15 min, and 2 mmol of hydrogen peroxide. Oxidation of various alcohols was also investigated under the optimized conditions. The catalyst [BBIM]Br–SnCl2 can be easily recovered and reused for six reaction runs without significant loss of catalytic activity, because the Sn species of the catalyst can be coordinated with the imidazole ring of the ionic liquid. The reused catalyst was further characterized by Fourier transform infrared spectroscopy to evaluate its chemical properties. The results proved that the [BBIM]Br–SnCl2 catalyst was stable and reusable for the oxidation reactions. A possible mechanism for the oxidation of benzyl alcohol to benzaldehyde is proposed.

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“…The two terminal hydroxyl groups were bound on the surface of the Pt-Bi nanoparticles by the formation of a hydrogen bond between the Cl ion of BiOCl and the H of the primary -OH group of the glycerol molecule, and the bismuth adatoms' function as site blocker on the surface of the Pt metal to control glycerol orientation towards the oxidation of the secondary -OH group. The weak electronic interaction between Pt and Bi could improve the catalytic activity through activating oxygen [36]; however, the hydrogen bond role between the BiOCl and glycerol could also work to some extent in the Pt-Bi/HT system. secondary -OH group.…”

Section: Glycerol Selective Oxidation Mechanismmentioning

confidence: 99%

“…secondary -OH group. The weak electronic interaction between Pt and Bi could improve the catalytic activity through activating oxygen [36]; however, the hydrogen bond role between the BiOCl and glycerol could also work to some extent in the Pt-Bi/HT system. Figure 6.…”

Section: Glycerol Selective Oxidation Mechanismmentioning

confidence: 99%

Promoting Role of Bismuth on Hydrotalcite-Supported Platinum Catalysts in Aqueous Phase Oxidation of Glycerol to Dihydroxyacetone

Xue

Wang

et al. 2018

Catalysts

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Abstract:Bismuth plays important roles in promoting the oxidation of alcohols towards high-valueadded chemicals over a noble metal loading catalyst. Herein, Mg-Al hydrotalcite-supported platinum-bismuth nanoparticles (Pt-Bi/HT) were prepared by the co-impregnation method and used in the selective oxidation of glycerol towards dihydroxyacetone (DHA). The incorporation of Bi species into Pt/HT significantly enhances the conversion of glycerol and the selectivity of DHA. The high selectivity of DHA with 80.6% could be achieved at 25.1% conversion of glycerol. The Bi species of the Pt-Bi/HT catalyst mainly exist in the form of BiOCl and Bi metal, which is different from the previous Pt-Bi based catalyst, confirmed by a combination of powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and high-resolution transmission electron microscopy (HR-TEM). A plausible mechanism is proposed to elucidate the promoting role of Bi species on the Pt/HT catalyst in the selective oxidation of glycerol towards DHA.

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Promoting role of bismuth on carbon nanotube supported platinum catalysts in aqueous phase aerobic oxidation of benzyl alcohol

Cited by 68 publications

References 54 publications

Spinel‐Type Mixed Oxides for Stable and Selective Partial Oxidation of Benzyl Alcohol

Spinel‐Type Mixed Oxides for Stable and Selective Partial Oxidation of Benzyl Alcohol

Efficient and Reusable Sn(II)‐containing Imidazolium‐based Ionic Liquid as a Catalyst for the Oxidation of Benzyl Alcohol

Promoting Role of Bismuth on Hydrotalcite-Supported Platinum Catalysts in Aqueous Phase Oxidation of Glycerol to Dihydroxyacetone

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