摘要
选择了3种不同的工业化γ-Al2O3载体,其中W203型和W217型是典型的中孔γ-Al2O3载体,而W251型是特殊的大孔γ-Al2O3载体,考察了它们负载的Pd/γ-Al2O3催化剂催化C9石油树脂加氢的性能;采用N2吸附-脱附、CO化学吸附、SEM、TEM、XRD等表征手段对γ-Al2O3载体及Pd/γ-Al2O3催化剂进行了表征。实验结果表明,加氢催化剂载体的孔性质对其催化C9石油树脂加氢性能具有重要影响,存在大量大孔的载体制备的Pd/γ-Al2 O3催化剂在大分子催化加氢反应中表现出更高的催化活性和稳定性。3种工业化γ-Al2O3载体的平均孔径及其负载的Pd/γ-Al2O3催化剂的催化活性和稳定性的高低均遵循同样的顺序:W203<W217<W251。W251型γ-Al2O3载体有大量的大孔,Pd前体容易进入载体的大孔内部,有利于Pd的分散,倾向于形成"蛋白型"催化剂。
Three industrial γ-Al2O3 S, namely W203, W217 and W251, were used as supports of Pd/γ-Al2O3 catalysts, in which W203 and W217 were typical mesoporous γ-Al2O3 supports, and W251 was a special macroporous support. Catalytic activity of the Pd/γ-Al2O3 catalysts in hydrogenation of C9 petroleum resin was investigated. The γ-Al2O3 supports and the Pd/γ-Al2O3 catalysts were characterized by means of N2 adsorption-desorption, CO chemisorption, SEM, TEM and XRD. The results indicated that the influence of the pore structure of the supported catalysts on the catalytic hydrogenation of C9 petroleum resin was significant and the catalyst with adequate macroporous structure showed higher activity and stability in catalytic hydrogenation of the macromolecules. Average pore sizes of the three industrial γ-Al2O3 s, and activity and stability of the Pd/γ-Al2O3 catalysts followed with the same order： W203 〈W217 〈W251. Pd precursor could easily enter into W251 support interior with macropores, so the Pd dispersion was promoted and the catalyst with ＂egg white＂ structure formed.
出处
《石油化工》
CAS
CSCD
北大核心
2011年第10期1105-1109,共5页
Petrochemical Technology
关键词
碳九石油树脂
γ-氧化铝载体
催化加氢
钯催化剂
C9 petroleum resin
γ-alumina support
catalytic hydrogenation
palladium catalyst
