Infrared study on T β-radiolysis in the CaSO4·0.5H2OT2O system

Kanesaka, Isao; Oda, Kazuhiro

doi:10.1016/0584-8539(94)00234-3

Cited by 4 publications

(2 citation statements)

References 10 publications

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“…This indicates that peroxide species were formed on the catalyst surface. 53,54 The Raman spectra of the CaO catalyst (inset in Figure S11) shows a distinctive peak at 846 cm −1 , which is in line with that of a CaO 2 sample and further verifies the formation of peroxide species. 55 An iodometric method analysis showed that the amount of peroxide species accounted for 0.69 wt % (Figure 3, calculated on the basis of CaO 2 ) of the CaO sample.…”

Section: ■ Reaction Mechanismsupporting

confidence: 56%

Catalytic Aerobic Oxidation of Lignocellulose-Derived Levulinic Acid in Aqueous Solution: A Novel Route to Synthesize Dicarboxylic Acids for Bio-Based Polymers

et al. 2021

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The world is facing grand and ever-increasing pressures on energy and environmental issues. Using carbon-neutral biomass to prepare monomers such as dicarboxylic acids for degradable polymers is of great significance and an urgent but challenging task. Herein, we report a catalytic route for the synthesis of 2-hydroxy-2-methylsuccinic acid, an excellent monomer: e.g., it is able to remarkably enhance the comprehensive properties of polybutylene succinate as shown herein. By catalytic aerobic oxidation of levulinic acid, a bulk platform chemical derived from lignocellulose, the target product was obtained with a very high selectivity of up to ca. 95%. The mild reaction conditions below 100 °C in water and the low-cost reusable heterogeneous catalyst further make the process highly attractive for applications. This process was also found to be effective for the conversion of homologues of levulinic acid to dicarboxylic acids. We studied the C−C bond rearrangement and the roles of catalysts in the reaction that are highly likely involved in a superoxide anion radical mechanism. This study may provide inspiration for the synthesis of bio-based dicarboxylic acids via alternative routes.

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Section: ■ Reaction Mechanismsupporting

confidence: 56%

Catalytic Aerobic Oxidation of Lignocellulose-Derived Levulinic Acid in Aqueous Solution: A Novel Route to Synthesize Dicarboxylic Acids for Bio-Based Polymers

et al. 2021

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“…The presence of these two solids was shown by the X-ray diffraction and IR spectroscopy performed on the residue obtained after the attack (Figure 4 and Figure 5). Indeed, for the IR spectrum, a new band was seen to appear at around 3400 cm −1 which is characteristic of the valence vibration of the O-H of the water molecule in DH [43]. Similarly, the X-ray diffraction pattern shows the appearance of the characteristic lines of DH [44].…”

Section: Effect Of the Solid/liquid Ratiomentioning

confidence: 91%

Attack of Tunisian Phosphate Ore by a Mixture of Sulfuric and Phosphoric Acid: Thermochemical Study by Means of Differential Reaction Calorimetry

Lachkar-Zamouri¹,

Brahim²,

Bennour-Mrad³

et al. 2018

AMPC

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A calorimetric, Differential Reaction Calorimetry (DRC), study of the thermochemical of the attack of a phosphate ore from Gafsa region (Tunisia) by a mixture of sulfuric and phosphoric acid is undertaken at different solid-liquid ratio and different temperature. The plot of the quantity of heat measured by integrating the raw signal as a function of the dissolved mass in the same volume solution at 25˚C presents three straight segments attributed at the formation of the hemihydrate (CaSO 4 •1/2H 2 O:HH), the dihydrate (CaSO 4 •2H 2 O:DH) or a mixture of these two products checked by X-ray diffraction, infrared spectroscopy and thermal analysis (Differential Scanning Calorimeter: DSC). The attack by the acid mixture was performed at higher temperature and showed in addition the formation of another form of calcium sulfate:anhydrous (CaSO 4 :AH). Moreover, the variation of mass enthalpy versus temperature presents a break at the T = 45˚C. According to our results, it seems that the effect of the temperature on the sulfo-phosphoric attack reaction on the natural phosphate (NP) generates a change of mechanism at around 45˚C.

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Optimization for the tritium isotope separation factor and permeation by selecting temperature and thickness of the diffusion Pd–Ag alloy cathode

Bellanger¹

2009

Fusion Engineering and Design

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Infrared study on T β-radiolysis in the CaSO4·0.5H2OT2O system

Cited by 4 publications

References 10 publications

Catalytic Aerobic Oxidation of Lignocellulose-Derived Levulinic Acid in Aqueous Solution: A Novel Route to Synthesize Dicarboxylic Acids for Bio-Based Polymers

Catalytic Aerobic Oxidation of Lignocellulose-Derived Levulinic Acid in Aqueous Solution: A Novel Route to Synthesize Dicarboxylic Acids for Bio-Based Polymers

Attack of Tunisian Phosphate Ore by a Mixture of Sulfuric and Phosphoric Acid: Thermochemical Study by Means of Differential Reaction Calorimetry

Optimization for the tritium isotope separation factor and permeation by selecting temperature and thickness of the diffusion Pd–Ag alloy cathode

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