封装型Pt/SOD分子筛的合成及表征

基于封装型贵金属分子筛的合成,充分利用其择形性和氢溢流特性构建新型加氢催化剂,选定Pt作为活性组分,方钠石作为载体,通过水热合成法直接将金属前驱体Pt(NH_3)_4Cl_2引进SOD合成母液中进行晶化,合成了不同封装量的Pt/SOD分子筛。采用苯加氢反应测试样品的催化活性,并运用XRD、SEM、TEM和H_2-TPD对样品进行表征。结果表明,合成的不同封装量的Pt/SOD样品均具有良好的催化活性,与溢流氢受体HZSM-5间均具有良好的氢溢流效应。其中,当金属前驱体Pt(NH_3)_4Cl_2的用量为(Pt(NH_3)_4Cl_2)∶(Si-Algel)比为0.030 g/g时,所合成的Pt/SOD样品最佳,催化苯加氢反应的苯转化率可达54.38%。

Synthesis and characterization of encapsulated Pt/SOD zeolites

An advanced hydrogenation catalyst was designed based on the good properties of encapsulated noble metal catalysts,which could be applied in the shape selectivity and hydrogen spillover reactions.Pt,sodalite zeolites and Pt(NH₃)₄Cl₂ were selected as the active components,carriers and metal precursors,respectively.Pt/SOD zeolites encapsulated with different amounts of Pt were hydrothermal synthesized.Then benzene hydrogenation reaction was used as probe reaction to test the catalytic activity of the samples.XRD,SEM,TEM and H₂-TPD were used to characterized the catalysts.The results showed that all Pt/SOD samples had good catalytic activity and excellent hydrogen spillover effect with spillover hydrogen acceptor HZSM-5.When the dosage of Pt(NH₃)₄Cl₂ was 0.063 6 g((Pt(NH₃)₄Cl₂):(Si-Al gel)=0.030 g/g),the Pt/SOD sample obtained showed the highest catalytic activity for benzene hydrogenation and the benzene conversion was 54.38%.