Molecular hydrogen and

Flydrodemetallization reduces the amount of nickel and, to a lesser extent, vanadium in FCC feeds. Nickel dehydrogenates feed to molecular hydrogen and aromatics. Removing these metals allows heavier gas oil cut points. 

Small amounts of molecular oxygen can influence the value of ff=0.675 With the rise of the 02 concentration in the electrolyte solution, the form of the Z", E curve changes and the value of (7=0 shifts toward less negative values. However, the effect is weak after saturation of the solution with molecular hydrogen and holding the pc-Bi electrode for 30 min at E = -1.35 V (SCE), the original shape of the Z", E curves and the original value of Eff=0 is restored. This indicates that oxidation and reduction of a pc-Bi electrode surface are reversible processes. 

This reduction can also be carried out with molecular hydrogen and as such is probably not of any commercial interest. However, it is suited for the study of the catalytic properties of the ultrafine powders and serves as a characterization and optimization technique for the titanium nitride nanoparticles in this study. 

In a unimolecular reaction, a molecule fragments into two pieces or rearranges to a different isomer, hi either case, a chemical bond breaks. For example, in the fragmentation of bromine molecules, breaking a ffbond gives a pair of bromine atoms Bf2 2 Br Recall that this unimolecular process is the first step of the reaction between molecular hydrogen and molecular bromine to give HBr. 

Four variables were studied in the part of the experimental program which examined the first step of the proposed two-step process. The variables were reaction temperature (413-454 C), solvent to coal ratio (2 1 and 3 1), residence time (0-5 minutes), and pressure (300-1800 psi nitrogen). Four experiments were done to simulate the second step, in which hydrogenated solvent and molecular hydrogen would be used to lower the sulfur content of the product. These experiments were done at 441 C for 2 minutes, with and without molecular hydrogen and recycle solvent containing 25 weight percent Tetralin. 

Class II second-order rate expressions are one of the most common forms one encounters in the laboratory. They include the gas phase reaction of molecular hydrogen and iodine (H2 + I2 -> 2HI), the reactions of free radicals with molecules (e.g., H -f Br2 -> HBr -f Br), and the hydrolysis of organic esters in nonaqueous media. 

The activity of the transition metals, especially for the chemisorption of molecular hydrogen and in hydrogenation reactions has been correlated, in the past, with the existence of partially filled d bands. Many alloy studies were prompted by the expectation that catalytic activity would change abruptly once these vacancies were filled by alloying with a group IB metal. Examples of such behavior have been collected together for the Pd-Au system (1). It is to be expected also that various complications might superimpose on the simple activity patterns observed for primitive... 

Calculations using the CDW-EIS model [38] are shown to be in good accord with 40-keV protons incident on molecular hydrogen and helium, and at this energy both theory and experiment show no evidence of any saddle-point enhancement in the doubly differential cross sections. However, for collisions involving 100-keV protons incident on molecular hydrogen and helium the CDW-EIS calculations [39] predict the existence of the saddle-point mechanism, but this is not confirmed by experiment. Recent CDW-EIS calculations and measurement for 80-keV protons on Ne by McSherry et al. [41] find no evidence of the saddle-point electron emission for this collision. 

Fujii, T., and Y. Saito, Thermocatalytic formation of molecular hydrogen and cyclo-octene from cyclo-octane by rhodium complexes. /. Chem. Soc., Chem. Commun., 757-758 (1990). 

The perhalogenated carbenes lg and lh are of unusual reactivity towards molecular hydrogen and hydrocarbons.62 Annealing of H2- or CH4-doped argon matrices containing the carbenes lg or lh at 30-45 K rapidly results in the formation of insertion products (Scheme 10). With H2 2,5-cyclohexadienone (14) is formed and with CH4 the 4-methyl-2,5-cyclohexadienone (16). The... 

These three systems are the only ones reported in the literature for achieving cofactor reduction utilizing molecular hydrogen and transition-metal complexes. 

At elevated temperatures, rupture of the C-C bond occurs forming molecular hydrogen and cyclopentadiene (95% yield) as the principal products (Rice and Murphy, 1942). 

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