The epoxidation of propylene catalyzed by TS-1 possesses the advantages of high atomic utilization and mild reaction conditions. To explore the structure–activity relationship of the catalyst, carbon nanotubes grown on the surface of nickel foam were used as the carrier to synthesize monolithic TS-1 by dry gel conversion in the tripropylamine-water gas environment. Compared with the powder TS-1 by hydrothermal crystallization, the crystallization time of monolithic TS-1 was shortened from 72 h to 12 h. Tripropylamine promoted the dissociation of dry gel by increasing the basicity of liquid film on the surface of dry gel. Water provided the necessary pressure for crystallization and was also the medium of mass transfer in the process of crystallization. Stepwise regression analysis showed the increase of Lewis acid content and pore volume improved the conversion and utilization of hydrogen peroxide and the selectivity of propylene to propylene oxide.

中文翻译：

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一种在三丙胺-水气氛中通过干凝胶转化高效合成整体 TS-1 的新策略，揭示了丙烯环氧化的构效关系

TS-1催化丙烯环氧化具有原子利用率高、反应条件温和等优点。为了探索催化剂的构效关系，以泡沫镍表面生长的碳纳米管为载体，在三丙胺-水气环境中通过干凝胶转化合成了整体式TS-1。与水热结晶粉体TS-1相比，整体式TS-1的结晶时间由72 h缩短至12 h。三丙胺通过增加干凝胶表面液膜的碱性来促进干凝胶的解离。水提供了结晶所需的压力，也是结晶过程中的传质介质。逐步回归分析表明，路易斯酸含量和孔体积的增加提高了过氧化氢的转化率和利用率以及丙烯生成环氧丙烷的选择性。