Water distillation is an effective method for detritiation and deuterium enrichment. This study focuses on the effect of the wettability of the packings surface on the separation performance of the H2O-HDO system. Hydrophilic coatings with different structures are prepared on the surface of copper packings by the method of alkaline erosion and oxidation, and it is found that the hydrophilic coatings with different structures showed different hydrophilic effects. The differences in mass transfer performance of packings with different contact angles are investigated. It is found that with the increase of hydrophilicity, the mass transfer performance of the packing is relatively improved. By combining empirical models of mass transfer and experimental data, a mathematical model for predicting the height of equal plate (HETP) is established to quantify the effect of wetting properties on the mass transfer process.
A highly dispersed monometallic palladium catalyst for selective hydrogenation of acetylene was prepared using N-containing silane coupling agent (SCA) as a modifier. The catalyst exhibited 90.3% ethylene selectivity with full acetylene conversion under 240 °C with a GHSV(C2H2) of 1200 h-1 and performs good stability within a 200 h tolerance test. Characterization results reveal that the excellent ethylene selectivity is mainly derived from the special Pd nanoparticle structure with Pd (111) lattice relaxation and distortion. The N-containing SCA modified catalyst shows more C atoms penetrating into the Pd lattice to form a stable PdC phase. This unique structure possesses an obvious suppression of hydrogen migration from the bulk Pd hydride to the surface and makes the catalyst have more abundant spillover hydrogen on the carrier surface. In addition, it has also weakened the ethylene adsorption ability and led a strong interaction between the Pd nanoparticles and surface.