烃类化合物炔键选择加氢Pd-Pb/CaCO_3催化剂的改进  

Improvement on Pd-Pb/CaCO_3 catalyst for selective hydrogenation of acetylenic linkage in hydrocarbons

作　　者：李长有[1] 杨乐夫[1] 黄波[1] 胡昱翔[1] 蔡俊修[1] 

机构地区：[1]厦门大学化学系,福建厦门361005

出　　处：《工业催化》2005年第1期44-49,共6页Industrial Catalysis

摘　　要：利用XRD和SEM研究了EDTA、草酸等助剂对沉淀CaCO3显微结构的影响,结果表明,CaCO3晶型及形貌随助剂不同而变化,甚至同一助剂不同添加量亦会导致其晶相的显著差异。XRD分析表明,在草酸存在下,沉积物为单一的方解石相,该晶型的CaCO3对Pd Pb/CaCO3催化剂呈现明显的模板效应。不同还原方法的尝试说明,水合肼是一种好的还原剂。TEM研究表明,在适宜条件下对催化剂老化处理,表面金属钯颗粒发生聚并,并且由此带来部分氢化选择性的较大提高。Influences of additives (PVA, oxalic acid, EDTA, ZnCl_2) on microstructure of precipitated calcium carbonate (CaCO_3) were investigated using SEM and XRD. The results indicated that crystal form and shape of CaCO_3 vary with both type and quantity of the additives. XRD results showed that the deposit crystallized in calcite in the presence of oxalic acid,which exhibited distinct template effect in Pd-Pb/CaCO_3 system. The test results of different reduction methods showed that hydrazine hydrate was a good reducing agent. TEM images showed that palladium particles on the catalyst surface agglomerated after appropriate aging treatment and thus improved partial hydrogenation selectivity of the catalyst.

关 键 词：苯乙炔 炔键选择氢化 Lindlar催化剂 老化处理 选择性 

分 类 号：O623.124[理学—有机化学] O643.48[理学—化学]