Pd／Al2O3催化剂上裂解C5馏分选择性加氢反应研究

研究了负载在Al2O3载体上的贵金属钯（Pd）基催化剂在裂解C5馏分中选择性加氢反应中的性能。结果表明，Pd／Al2O3催化剂上可进行选择性加氢的反应条件区域为压力0．5～1．0MPa、体积空速2—4h^-1、氢油体积比100：1～300：1和反应温度为55—65℃，在此反应条件下，炔烃能被完全加氢去除，同时二烯烃发生部分转化，转化产物主要为单烯烃，其中二烯烃转化的产物主要是热力学相对稳定的单烯烃；在选定的反应条件中，随温度升高、压力增加、氢油比增加，炔烃、二烯烃转化率提高；而随液时空速增加，二烯烃转化率有所下降；在各反应条件中，温度和压力对催化剂加氢性能影响较为显著；制备的Pd／Al2O3催化剂对于炔烃和二烯烃具有好的选择性加氢能力，可能原因一方面是由于反应条件选择较缓和，另一方面是原料中硫的存在。

Study on Selective Hydrogenation of C5 Fraction From Steam Cracking Over Pd/Al2O3 Catalyst

The performance of Pd/Al2O3 catalyst for selective hydrogenation of C5 fraction from steam cracking was researched. The results show that the suitable reaction conditions are as follows ：pressure 0.5 - 1.0 MPa, LHSV 2 -4 h-1, H2/oil volume ratio：100： 1 - 300： 1 and reaction temperature 55 -65 ℃ in selective hydrogenation over Pd/Al2O3 catalyst. Under this conditions, the alkyne can be hydrogenated completely and dienes can partially be reacted to mono - olefin. The mono - olefins in products are thermodynamics stabilization relatively. The conversion of alkyne and diene increases with the increase of temperature, pressure and H2/oil volume ratio, but decreases with the increase of LHSV. About those reaction conditions, the effect of reaction temperature and reaction pressure is notable relatively. The selectivity of Pd/Al2O3 catalyst to alkyne and diene is due to the suitable reaction conditions and existence of sulfur in feed.