TPAOH处理制备的微介孔催化剂物化性质与噻吩烷基化性能研究

Physical and chemical properties of micro-mesoporous catalysts with tetrapropylammonium hydroxide treatment and their performance in thiophene alkylation

    摘要
  • 摘要: 采用不同浓度的TPAOH溶液处理不同SiO2/Al2O3物质的量比的HZSM-5分子筛，制备了微孔-介孔多级孔HZSM-5催化剂。结果表明，采用不同浓度的TPAOH溶液处理不同SiO2/Al2O3物质的量比的HZSM-5分子筛能够脱出HZSM-5分子筛的骨架硅而产生介孔，介孔孔径随TPAOH溶液浓度和SiO2/Al2O3物质的量比的增大而增大；TPAOH溶液处理能够调变HZSM-5催化剂的酸性。采用不同浓度的TPAOH溶液处理SiO2/Al2O3物质的量比分别为50、80和150的HZSM-5分子筛，其中，SiO2/Al2O3物质的量比为50的HZSM-5弱中酸酸强度、相对酸量、B酸和L酸含量明显高于SiO2/Al2O3物质的量比为80和150的HZSM-5分子筛。经不同浓度的TPAOH溶液处理后SiO2/Al2O3物质的量比为50的HZSM-5催化剂具有最佳的噻吩烷基化反应性能。

     

    Abstract: HZSM-5 zeolites with different molar ratios of SiO2/Al2O3 were treated by different concentrations of tetrapropylammonium hydroxide (TPAOH) solution. HZSM-5 zeolites with micro-meso pores were synthesized. The results show that the treatment of HZSM-5 zeolite with different molar ratios of SiO2/Al2O3 by different concentrations of TPAOH could cause desilication. The pore diameter of mesopores increases with the increase of TPAOH concentration and SiO2/Al2O3 molar ratios. Meanwhile, the acidic properties were adjusted. HZSM-5 zeolites were treated by different concentrations of TPAOH solution, whose SiO2/Al2O3 molar ratios are 50, 80 and 150. HZSM-5 with SiO2/Al2O3 molar ratio of 50 is obviously better than others in the content of relative acid, L-acid, B-acid and the strength of weak acid. HZSM-5 (SiO2/Al2O3 molar ratios is 50) by the treatment of TPAOH in different contents is most preferable for thiophene alkylation.

     

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