Effect of temperature and time on the (a) hydrogenation; and (b) dehydrogenation kinetics of nanocomposite MgH 2 /5.2TiC/4.6FeCr powders obtained after ball milling for 50 h. The dehydrogenation kinetics measured at 250 °C (open symbols) and 275 °C (closed symbols) after 5 min of desorption are presented in Figure 9c.

4 and (c) ball-milled MgH 2 doped with 7 mol% CoFe 2O 4 after dehydrogenation. Fig. 7. XRD patterns of ball-milled MgH 2 doped with 20 mol% CoFe 2O 4 after dehydrogenation. Fig. 8. XRD patterns of the ball-milled MgH 2 doped with 7 mol% CoFe 2O 4 after rehydrogenation. Fig. 9. Dehydrogenation and the second dehydrogenation curves of the ball ...

Hydrogenation and dehydrogenation properties of MgH 2 were improved by combined nanoconfinement of carbon and catalysis roles. Roquefere et al. co-milled Mg 6 Pd and Fe in a high energy mill to improve the hydrogenation and dehydrogenation kinetics. They reported that the presence of iron greatly modifies the hydrogenation properties and the ...

Reaction parameters for oxidative dehydrogenation of γ-terpinene 9 to p-cymene 10 were studied in great detail by Stolle et al. (Scheme 6.4) [5].It was found that potassium permanganate is the most efficient oxidant in mechanochemical reaction.

006 Solvent-free dehydrogenation of -terpinene in a ball mill: Investigation of reaction parameters 007 Biomimetic green chemistry 009 Biomimicry 010 Molecular biomimetics: Nanotechnology through biology 012 Green engineering …

XRD patterns of MgH 2 powders obtained after 25 h and then subjected to hydrogenation process at (a) 50 °C, (b) 100 °C, (c) 250 °C, and (d) 275 °C. The XRD patterns of the samples obtained after 12.5 h, 25 h, 50 h and 100 h and then subjected to dehydrogenation process conducted at 275 °C, are shown in (e,f,g and h), respectively.

It may be derived biogenetically from a C 20 quassinoid via a 1,2-dioxo derivative by oxidative bond cleavage between C-l and C-2, decarboxylation, contraction of ring B, and formation of the oc,fJ-unsaturated y-lactone [25]. 52 Ailanthus altissima (Mill.)

planetary ball milling in hydrogen is explained in detail in previous works [4,8]. The quantities of hydrogen absorbed by hydrogenation at 593 K in 12 bar hydrogen or released by dehydrogenation at 593 K in 1.0 bar hydrogen, as hydrogenation or dehydrogenation progressed, were measured using a

Crusher Plant Supplier China. Sep 16, IH Drotts in the SE Davis & Son Collection of Vintage plant Drott Manufacturing Company was a manufacturer of industrial equipment, …

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The scale-up of the Knoevenagel-condensation between vanillin and barbituric acid carried out in planetary ball mills is investigated from an engineering perspective. Generally, the reaction proceeded in the solid state without intermediate melting and afforded selectively only one product. The reaction has been used as a model to analyze the influence and relationship of …

The CMB-C 3 N 4 is formed of cyanuric acid (C), melamine (M), and 5 mol % barbituric acid (B), which is calcined to yield the modified g-C 3 N 4 with heterojunctions formed in situ. CMB-C 3 N 4 has been shown to be superior to g-C 3 N 4 and mesoporous g-C 3 N 4 (mpg-C 3 N 4 ) in the photocatalytic hydrogen evolution reaction due to a better ...

A convenient solvent-free method for the synthesis of benzothiazole, benzimidazole, and benzoxazole derivatives has been developed using recyclable ZnO-NPs via a ball-milling strategy. The method affords environmentally friendly reaction conditions that score high on the ecoscale with the low E-factor. The process is also highly efficient even on a multi-gram scale …

Ball Mills afforded some precautions since azides are in general shock-sensitive materials. ... dehydrogenation of γ-terpinene to -cymene [p 10] and the oxidative cleavage of β-pinene affording nopinone [11]. Especially the last example proved to be a real alternative for

As a model for a C−C-coupling procedure a Suzuki−Miyaura reaction has been studied under mechanochemical conditions. Important parameters influencing the yield of the reaction are the revolutions per minute, the milling time, and the material of the milling balls and beakers, as well as the size and number of milling balls.

[8] Szuppa, T.; Stolle, A.; Ondruschka, B.; Hopfe, W. Solvent-free dehydrogenation of γ-terpinene in a ball mill: investigation of reaction parameters. Green Chem. 2010, 12: 1288-1294. Search in Google Scholar [9] Thorwirth, R.; Stolle, A. Solvent-free synthesis of enamines from alkyl esters of propiolic or but-2-yne dicarboxylic acid in a ...

Abstract. Ball-milled hexagonal boron nitride (h-BN) involving oxidized boron on the surface was found to catalyze oxidative dehydrogenation of ethane with high selectivity to ethylene (92–96%) whereas pristine h-BN showed poor selectivity (42%). The calcination of the ball-milled h-BN at the temperature of 550 °C or higher resulted in the ...

Reaction parameters for oxidative dehydrogenation of γ-terpinene 9 to p-cymene 10 were studied in great detail by Stolle et al. (Scheme 6.4) [5]. It was found that potassium permanganate is the most efficient oxidant in mechanochemical reaction.

The present article reports on the solvent-free dehydrogenation of γ-terpinene (1) in a planetary ball mill affording p-cymene (2) as the predominant reaction product.

Embodiments of the present disclosure relate to advanced polishing pads with tunable chemical, material and structural properties, and new methods of manufacturing the same. According to one or more embodiments of the disclosure, it has been discovered that a polishing pad with improved properties may be produced by an additive manufacturing process, such as a three …

Organic reactions of sulfur dioxide. Reactions with nucleophilic double bonds leading to the isomerization, aromatization, selective hydrogen-deuterium exchange, and …

The ball-milling process was performed at 25°C in a vertical planetary ball mill (DECO-PBM-V-0.4L) ... W. Solvent-free dehydrogenation of [gamma]-terpinene in a ball mill: Investigation of reaction parameters. Green Chem. 2010, 12, 1288–1294. [Google Scholar]

Szuppa T, Stolle A, Ondruschka B, Hopfe W (2010) Solvent-free dehydrogenation of γ-terpinene in a ball mill: investigation of reaction parameters. Green Chem 12:1288–1294 CrossRef Google Scholar 63.

The dehydrogenation of Mg 2 NiH 0.3 into Mg 2 Ni when the decomposition of MgH 2 is complete, so the dehydrogenation process of Mg 2 NiH 0.3 will occur at a higher temperature: Mg 2 NiH 0.3 ↔Mg 2 Ni+H 2. The dehydrogenation temperature of YH 2 and YH 3 is generally around 790 °C and 400 °C, respectively [36,38].

Oxidative cracking prevails in the n-butane dehydrogenation with CO 2, and most of the products will be propylene and ethylene [154].So it is difficult to understand the role of CO 2 in the dehydrogenation process. Whatever the small promoting effects of CO 2 were observed on the other catalysts [143].Unlike the conversion of C-1–C-3 alkanes in the presence of CO 2, the …

Significantly Improved Dehydrogenation of Ball-milled MgH2 Doped with CoFe2O4 Nanoparticles. By Alex A Volinsky. Download pdf.

The powders were mixed in a ball mill for 1 h. The finished mixture was subjected to single-action compacting at a pressure of 30–90 MPa, sintered at 1300–1450°C in air for 1 h, and cooled to room temperature for 2 h.

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a milling material: agate, 20 min, 800rpm ≙ 13.3 Hz. b 20 min at 20 °C with maximal power input. c 60 in at 80 °C. d 30 min at 80 °C, maximal power input = 300 W.. The effective transfer of energy from the power socket into a product of interest has been proven for a number of examples. When different ball mills are compared with respect to their gross power …