A binary mixture of rarefied gases between two parallel plates is considered. The Poiseuille flow, the thermal transpiration, and a flow caused by a concentration gradient of a component gas along the plates are investigated on the basis of the linearized Boltzmann equation for hard-sphere gases with the diffuse reflection boundary condition. Accurate numerical analyses are performed by means of a finite-difference method, in which the complicated collision integrals are computed efficiently by the numerical kernel method. As a result, the behavior of the mixture is clarified at the level of the velocity distribution functions as well as the macroscopic quantities for a wide range of the Knudsen number.

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Modeling and prediction of molecular weight by MBR.

The specific activity of the Co–W–S phase, formed on WS2/SiO2 (presulfided above 973 K) by a CVD technique using Co(CO)3NO, was 1.6 times as high as that of the Co–Mo–S phase formed on MoS2/SiO2 (above 873 K) for the hydrodesulfurization of thiophene, demonstrating, for the first time, that in sharp contrast to general belief, Co–WS2 is a much more favorable combination for the generation of catalytic synergy than Co–MoS2, which has been widely used in industry.