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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.
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High-energy milling (SPEX mill) and low-energy milling (rolling jar) techniques were used in this work. The results demonstrated that monolithic LiMgN can be produced using the low-energy ball milling technique. The hydrogenation properties of the as-prepared LiMgN .
The reactive ball milling (RBM) process was carried out at room temperature, using a high energy ball mill (Planetary Mono Mill PULVERISETTE 6, Fritsch, Germany). After 6 h of RBM time, the powders were discharged from the vial inside the glove box and sealed in Pyrex vails.
Feb 11, 2019· Reactive ball milling was then carried out at room temperature using a the PM400 high energy ball mill. After 6, 12.5, 25, 50, 100 and 200 hours of reactive ball milling, the reaction was halted and a small amount (50 mg) of MgH 2 powder was then extracted in the glove box and sealed in vials. The as-reacted ball-milled powders obtained after ...
This is sufficient to prove that MgH2 can react with dehydrogenation of the sample is carried out. Fig. 9 exhibits the CoFe2O4 at about 189 C. first dehydrogenation and the second dehydrogenation curves of Following the first complete dehydrogenation, the samples the ball-milled MgH2 doped with 7 mol% nanosized CoFe2O4 and were subjected to ...
Apr 07, 2015· 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 input and the degree of ...
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.
energy reactive ball milling of pure Mg powders under 50 bar of a hydrogen gas atmosphere. The powders obtained after 200 h of milling were doped with 7 wt% of Mn 3.6 Ti 2.4 powders and then ball milled 50 h, using a high energy ball mill. The as-milled MgH 2 /7Mn 3.6 Ti 2.4 nanocomposite powders obtained after 200 h of milling were homogeneous
Speed-up your synthesis lab: Planetary Ball Mills as a tool in organic synthesis . ... 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
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Effect of ball-milling duration and dehydrogenation on the morphology, microstructure and catalyst dispersion in Ni-catalyzed MgH 2 hydrogen storage materials Stephen D. House,a,⇑,1 John J. Vajo,b Chai Ren,c Angus A. Rocketta and Ian M. Robertsona,d
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High-density fuel candidates have been synthesized in up to 90% yield from β-pinene, a renewable strained bicyclic compound derived from wood and plant sources. The process is based on the heterogeneous acidic catalysts Montmorillonite-K10 and Nafion, which promote selective isomerization and dimerization of pinenes under moderate conditions (100 °C and atmospheric pressure).
Solvent-free dehydrogenation of γ-terpinene in a ball mill ... 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... دریافت قیمت
Fig. 10 presents the variation of Ti valence states in prepared Ti 3 C 2 and LiAlH 4 +20 wt% Ti 3 C 2 before and after dehydrogenation. For Ti 3 C 2 before ball milling with LiAlH 4, the high-resolution XPS spectrum of Ti 2p can be deconvoluted into four peak components, which are assigned to Ti–C and Ti 2+ species, as seen in Fig. 10(a).
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Optimization of the operating conditions of a lab scale Aljet mill, Mar 7, 2003, mill (Aljet mill), which is very useful in particle size reduction at early, energy mill and the ball mill are the only 2 .
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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. The influence of various reaction parameters and technical variables on the transformation of 1 .
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dehydrogenation. A second common reaction is the oxidative cleavage of carbon-carbon double bonds.This was observed with the formation of camphenilone from camphene and the genera-tion of two keto aldehydes by cleavage of the double bonds ln a-terpinene (Figure 2). Smog chamber studies on numer-ous terpenes using ozone and/or hydroxyl radical ...
The milling energy generated by this type of mill is relatively modest by comparison with the magneto-mill Uni-Ball Mill 5 used for inducing a profound mechanical dehydrogenation reported in [3,4,6,7,8,9,10,11,12]. In addition, the milling time up to 5 h used in the present work might have been too short to provide a sufficient milling energy ...
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