混合碱处理制备微介孔催化剂及其噻吩烷基化催化性能

发布时间：2018-05-25 09:20

  本文选题：混合碱处理 + 多级孔　； 参考：《燃料化学学报》2017年02期

【摘要】：以SiO_2/Al2O3物质的量比为50的H-ZSM-5分子筛为母体,分别采用Na_2CO_3溶液处理后加入TPAOH溶液进行二次晶化法以及Na_2CO_3/TPAOH混合溶液同时处理法,制备了微孔-介孔多级孔HZSM-5催化剂,对其噻吩烷基化反应催化性能进行了研究。结果表明,采用4 mol/L的Na_2CO_3溶液处理后的催化剂在TPAOH溶液中发生了二次晶化;当TPAOH溶液浓度为0.3 mol/L、晶化温度为170℃、晶化时间为24 h时,得到的HZ(CO_2-3-TPA+,0.3-24-170)催化剂具有适宜的孔径和酸性,其噻吩烷基化转化率最高(99.1%)。而Na_2CO_3/TPAOH同时处理HZSM-5分子筛所得的催化剂,由于生成大量SiO_2堵塞了孔道,覆盖了催化剂表面,降低了催化剂的平均孔径和酸性,不适合噻吩烷基化反应。
[Abstract]:The microporous and mesoporous multiporous HZSM-5 catalysts were prepared using H-ZSM-5 molecular sieve with the mass ratio of SiO_2/Al2O3 to 50 as the matrix, the microporous and mesoporous multiporous HZSM-5 catalysts were prepared by the secondary crystallization of TPAOH solution and the simultaneous treatment of Na_2CO_3/TPAOH mixed solution by adding TPAOH solution after Na_2CO_3 solution treatment. The catalytic performance of thiophene alkylation reaction was studied. The results show that the catalyst treated with 4 mol/L Na_2CO_3 solution has secondary crystallization in TPAOH solution, when the concentration of TPAOH solution is 0.3 mol / L, the crystallization temperature is 170 鈩，

本文编号：1932906