The isotopic exchange between H2S and D2 on molybdenum disulfide and manganese sulfide has been studied kinetically between 420° and 500 °C. The reaction proceeded via these steps:
& H_2S+D_2=D_2S+H_2
& H_2+D_2=2HD
From the analysis of the kinetic data, the rate constant of the sulfurization of both metal sulfides by “hydrogen sulfide,” ki, and that of their reduction by “hydrogen,” ki′, were calculated. The dependence of these rate constants on the sulfur activity was determined. A possible mechanism of the reaction at the surface of the sulfides is discussed in this paper.
Hydrogen is evolved from an alkaline solution of formaldehyde in the presence of a tungsten carbide catalyst at room temperature under atmospheric pressure. Neither platinum nor palladium shows any catalytic activity to this reaction. The hydrogen evolution competes with the Gannizzaro reaction.
A phase diagram is presented for the liquid-liquid phase separation of lithium in liquid deuterioammonia. Phase separations occur at temperatures below -51.4°C for Li-NDS, compared to -63.5°C for Li-NH3. The replacement of NH3 by ND3 is not accompanied by a significant change of the critical concentration. No change in natural isotopic distribution was observed between the two liquid phases of Li-ammonia solutions.
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