汽油中正戊硫醇的催化空气氧氧化脱除Ⅰ.CuZnAl复合氧化物催化剂的催化活性

Aerobic Oxidation Removal of 1-Pentanethiol from Gasoline Ⅰ. Catalytic Activity of CuZnAl Composite Oxide

以CuZnAl复合氧化物为催化剂，以空气为氧化剂，在固定床反应器中进行了模拟汽油中正戊硫醇的催化空气氧氧化脱除反应．考察了空速、氧气／硫比和反应温度等因素对脱除正戊硫醇效果的影响．结果表明，正戊硫醇的脱除可以在重时空速为50～70h^-1，反应温度为150和300℃下高效地进行，在100h内正戊硫醇的转化率维持在90％以上．正戊硫醇氧化在150℃下发生二聚生成二聚物；在300℃下反应初期以深度氧化生成SO2为主，但随着反应时间的延长深度氧化反应逐渐减弱而二聚反应逐渐增强．

The aerobic oxidation of 1-pentanethiol in gasoline was carried out by mixing a small amount of air in gasoline and passing through a flxed-bed reactor packed with the CuZnAl composite oxide catalyst. The effects of reaction parameters, such as weight hourly space velocity, O2/S molar ratio, and reaction temperature, on the reaction performance were investigated. This process could proceed at high WHSV （50-70 h^-1） with high 1-pentanethiol conversion （ 〉95 % ） at 150 and 300 ℃ using an O2/S molar ratio of 20. The dimerization of 1- pentanethiol occurred dominantly to form its dimer at 150 ℃. The deep oxidation of 1-pentanethiol to SO2 was the dominant process at 300 ℃ in first tens of hours, but it decreased with prolonged time on stream and meanwhile the dimerization increased.