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Selective Hydrogenation of Isoprene on Pd-Au/Al2O3 Catalysts Modified with Bi
Author(s): 
Pages: 132-137
Year: Issue:  2
Journal: Petrochemical Technology

Keyword:  palladium-gold/alumina catalystspalladium-gold-bismuth ternary alloyisopreneselective hydrogenationelectronic effect;
Abstract: 采用等体积浸渍法制备了Bi改性的Pd-Au/A12O3催化剂,用低温氮吸附、CO-FTIR、H2-TPR等方法对催化剂进行了表征.CO-FTIR表征结果显示,随Bi含量的增加,以线性吸附的CO的比例增加,CO吸附峰随Bi含量的增加发生红移,说明Bi-Pd之间存在电子效应.H2-TPR表征结果显示,Bi改性后在催化剂表面形成了Pd-Au-Bi三元合金,因此改变了催化剂选择性加氢的活性.对改性前后Pd-Au/A12O3催化剂的异戊二烯选择性加氢活性评价结果表明,Bi的添加使催化剂对单烯烃的选择性提高,但同时活性下降;当反应温度为80℃时,随Bi含量的增加(w=0.1%~0.3%),异戊二烯的转化率由98%降至34%,2-甲基-2-丁烯的选择性由82.3%降至68.6%,3-甲基-1-丁烯和2-甲基-1-丁烯的选择性分别由2.1%,13.3%增至8.6%,22.0%.
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