硫化與再生銅觸媒

Sulfidotion and Regeneration of Copper Catalysts

10.6623/chem.1984017

陳郁文(Yu-Wen Chen)

化學

42卷3期（1984 / 09 / 01）

112 - 117

繁體中文

本文首先理論探討硫在銅金屬上之吸附／脫附的熱力與動力性質，吸附之硫的表面結構，以及硫化銅之熱力學性質。由於吸附於銅表面上之硫比硫化物穩定，因此即使硫化氫的濃度比其與硫化銅達到平衡時之濃度還低，觸媒仍有可能會被毒化。而且我們無法以氫氣來再生被硫毒化之觸媒，因為在不會使銅聚結（Sintering）之溫度下，硫化氫之平衡濃度非常低。實驗結果顯示以氧氣來再生它是可行的。

The thermodynamic and kinetic aspects of adsorption/desorption of chemisorbed sulfur on copper metal, the surface structure of bound sulfur, and the growth rates and the thermodynamics of copper sulfides were examined in this study. Sulfur chemisorption on Cu has a considerable exothermic heat of surface segregation with respect to the most stable bulk sulfide, so that catalyst poisoning can occur at H_2S concentration well below the equilibrium concentration of bulk sulfides. Regeneration of sulfur-poisoned Cu catalysts by reaction with pure hydrogen is not practical due to the very low equilibrium H28 partial pressure at temperature below which sintering is appreciable. The experimental results indicated that reaction with oxygen is feasible.