Hydrogen performance

Fig. 2. Iron—titanium hydride vessel (508 kg hydride, 6.4 kg hydrogen) performance of the Provo-Orem (Utah) bus at 3.4 MPa (493 psi) charge pressure, having 22 cylinders, each with a 75 mm dia and 1750 mm length, where (-) indicates tank pressure. To convert MPa to psi, multiply by 145. See text.

Fig. 17. 50 A-h nickel—hydrogen performance showing (a) pressure and (b) voltage curves where region A represents charging at 10 A, region B represents overcharge at 10 A, region C represents discharge at 25 A, and region D represents reversal at 25 A. To convert MPa to psi, multiply by 145.

In an effort to decrease hydrogen consumption during HDN, the search for more selective catalysts was approached by testing carbides, nitrites and borides [82], Although, the catalysts showed a superior hydrogenolysis activity over their hydrogenation performance, neither of the tested formulation surpassed the activity exhibited by commercial catalysts. 

As expected, cyclohexanone hydrogenation performed in an IL has a longer reaction time than in solventless conditions. Where using iridium nanoparticles dispersed in an IL, the biphasic hydrogenation of cyclohexanone could be performed at least 15 times, without any considerable loss in catalytic activity this contrasted with the use of nanoparticles in solventless conditions, when the catalytic activity begins to decHne after the third cycle. The standard experimental conditions established for the hydrogenation of other carbonyl compounds were 75 °C, 4atm of H2 and a molar substrate Ir ratio of 250. 

C02(C0)s ZnO Adsorption from solution and vacuum treatment Ion-pairing species stable up to 160°C under CO/H2 high selectivity to C1-C3 alcohols in CO hydrogenation, performance in ethylene hydroformylation [139]... 

Two commercially available types of Raney nickel were used as 60% aqueous suspensions B 113 W (Degussa) and M (Doduco) with no difference in the hydrogenation performance. 

The Acid-Base Titration activity (eChapter 3.10) allows you to simulate the titration of five acids, A through E. Assuming that the acids can all provide one hydrogen, perform simulated titrations and determine the concentration of all five acids. 

Explain how molecular hydrogen performs a control of polymer molecular weight in olefin polymerisation with Ziegler-Natta catalysts. 

Intramolecular nucleophilic substitution of hydrogen performed on a series of anilides 99 (X = H, Cl) has provided a route to various 4-nitrooxindoles 100. In some cases, the co-formation of minor amounts of the 6-nitro isomers was observed <02S2203>. 

In 1965 Wilkinson invented the rhodium-tris(triphenylphosphine) catalyst as a hydrogenation catalyst [60]. It still forms the basis for many of the chiral hydrogenations performed today. The most effective homogeneous hydrogenation catalysts are complexes consisting of a central metal ion, one or more (chiral) ligands and anions which are able to activate molecular hydrogen and to add the two H atoms to an acceptor substrate. Experience has shown that low-valent Ru,... 

Howard BH, Killmeyer RP, Rothenberger KS, Cugini AV, Morreale BD, Enick RM, and Bustamante F. Hydrogen performance of palladium-copper alloy membranes over a wide range of temperatures and pressures. J. Membr. Sci. 2004 241 207-218. 

L-dopa, used in the treatment of Parkinson s disease, is best prepared by asymmetric catalytic hydrogenation (15) of the enamide [6]. The hydrogenation, performed with a soluble rhodium catalyst modified with the... 

All hydrogenations performed with cationic Rh catalyst precursors [(COD)R]i-DuPHOS]OTf and with a-enamide methyl ester substrates in MeOH, unless otherwise noted. All results involving. -Cbz substrates were extracted from references 7 and 19. All results involving A-Boc substrates derive from reference 17. 

Table 6.3 A selection of the metal-free transfer hydrogenations performed under high temperature and pressure.

Table 6.13 A selection of the diastereoselective hydrogenations performed underflow conditions.

A duplicate of the 60-cell stack that will be used in the power plant was recently constmcted and then tested on synthetic reformate. Figures 4 and 5 show the performance of the stack on hydrogen and S5mthetic reformate respectively. Operating on reformate, the 60-cell exhibits near pure hydrogen performance. 

The reaction was carried out at 80 °C. The catalyst was suspended in a dioxane solution kept in a continuously stirred reactor while the hydrogen supply was bubbled into the liquid. The hydrogenation performance (expressed in terms of conversion) and the selectivity of the Pd/SiC nanotubes catalyst are presented in Table 7.1 and compared with those obtained on a commercial Pd/AC (activated charcoal). 

PROBLEM 11.8 What function does the hydrogen perform in hydrocarbon cracking ... 

We will also discuss another series of investigations on hydrogen performed by Hmsch and co-workers, which is of fundamental importance... 

Song, H., Tang, L., and Wu, X.C. (2010) Benzene hydrogenation performance over supported Ni-B/y-Al203 amorphous alloy catalyst Huaxue Gongcheng/Chem. Eng. (China), 38 (8), 39-43. 

---