Thermodynamics of sulfur chemisorption on metals. III. Iron and cobalt

摘要: Isosteric heats of chemisorption sulfur on iron and cobalt have been evaluated from measurements the equilibrium ratio H2S/H2 gas mixtures in contact with powdered metals over a temperature range 677 to 855 K. At low surface coverage cobalt, heat respect 1/2 S2(g) is −236±15 kJ mol−1. With increasing it decreases −200±10 The −197±15 For equivalent coverage, thermodynamic activity chemisorbed exceeds that by approximately one order magnitude. (<0.5 saturation coverage), bond strength various found vary order: Ni≳Co≳Ru≳Fe.