Pd／Al_2O_3催化剂物性对C_4馏份选择加氢性能的影响

考查了用浸渍法制备的Ｐｄ／Ａｌ２Ｏ３系列加氢催化剂的比表面、Ｐｄ含量、Ｐｄ在载体上的分散度及催化剂的孔径分布与Ｃ４馏份选择加氢反应性能的关系。采用微型催化反应器对Ｃ４馏份选择加氢的主要工艺条件进行了试验。结果表明，载体Ａｌ２Ｏ３在适当的温度下焙烧，使比表面约为１１０—１１５ｍ２／ｇ，控制Ｐｄ含量在０．１％—０．３％（ｍ），活性前身物ＰｄＣｌ２在４００—４５０℃分解８ｈ后用Ｈ２还原。制备成的催化剂，得到了较满意的Ｐｄ分散度和孔结构。在较佳的工艺条件（温度：３０—４０℃；压力：０．７—０．８ＭＰａ；Ｈ２／炔摩尔比：４—６；液体空速：１５ｈ－１）下，对上述催化剂进行评价，反应产物中总炔烃含量＜２０×１０－６，丁二烯损失＜３％。

Effect of the Physical Properties of Pd/Al 2O 3 Catalysts on Selective Hydrogenation of C 4 Cuts

In this paper,Pd/Al 2O 3 hydrogenation catalysts prepared by dipping were studied.The relationships among catalyst surface,Pd concentration,Pd dispersion on the carrier,catalyst pore dispersion and reaction properties of selective hydrogenation of C 4 cuts were investigated.The main process conditions of the selective hydrogenation were examined using a micro catalytic reactor.The results show that,when roasted at 900℃,the surface of the carrier is about 110 115m 2/g.A satisfactory catalyst can be obtioned with good dispersion of Pd and excellent pore structure by controlling the concentration of Pd in the range of 0 1% 0 3%(m),maintaining the pH of dipping solution at 4 5 and decomposing the precursor at 450℃ for about 8 hours and then reducing it in H 2 atmosphere,catalyst tests carried out under conditions of 30 40℃,0 7 0 8MPa,H 2/acetylenic compound(EA+VA) ratio of 4 6 and LHSV of 15hr -1 show that the amount of acetylenic compound(EA+VA)in the product is<20×10 -6 and butadiene loss is <3%.