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首页> 外文期刊>Catalysis science & technology >One-pot synthesis of mesoporous ZrPW solid acid catalyst for liquid phase benzylation of anisole
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One-pot synthesis of mesoporous ZrPW solid acid catalyst for liquid phase benzylation of anisole

机译：介孔ZRPW固体催化剂的一锅合成，用于苯二唑的液相苄基化

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摘要

Mesoporous zirconium phosphotungstate {M-ZrPW}, with large specific surface area (-170 m~2 g~(-1)), large pore volume (~0.25 cm~3 g~(-1)), uniform pore size distribution (~6.5 nm) and tunable W/Zr ratios (0-0.2), was successfully prepared via a facile one-pot evaporation-induced self-assembly (EISA) strategy. Small-angle X-ray diffraction (SXRD), transmission electron microscopy (TEM) and scanning electron microscopy (SEM) characterizations showed that these materials had a mesoporous structure even when the W/Zr ratio reached up to 0.2. The tungsten species introduced via this strategy highly were dispersed among the wall of mesoporous framework. More importantly, the tungsten species greatly improved the Bransted acidic property and catalytic activity in the Friedel-Crafts benzylation reaction. The highest activity was obtained at a W/Zr ratio of 0.2 with the strongest Bronsted acidity. In addition, the influences of various reaction parameters such as reaction time, amount of catalyst and calcination temperature of the catalyst, systematically investigated in this paper. Furthermore, the M-ZrPW showed a higher catalytic activity than H-Beta, H-ZSM5 and ZrPW prepared by the sol-gel method. Meanwhile, M-ZrPW could be reused at least for five cycles in the benzylation reaction without any notable decrease of catalytic activity.
机译：介孔锆磷酸盐{M-Zrpw}，具有较大的特定表面积（-170 m〜2 g〜（-1）），大孔体积（〜0.25 cm〜3 g〜（-1）），均匀的孔径分布（ 〜6.5 nm）和可调节ZR比（0-0.2）的可调节性通过轻松的单锅蒸发诱导的自组装（EISA）策略成功制备。小角度X射线衍射（SXRD），透射电子显微镜（TEM）和扫描电子显微镜（SEM）表征表明，即使W/ZR比达到0.2，这些材料也具有中孔结构。通过这种策略引入的能剂物种高度​​分散在介孔框架的壁中。更重要的是，钨种极大地改善了弗里德尔工艺苄基化反应中的脑酸性特性和催化活性。最高的活性是在0.2的W/ZR比，Bronsted酸度最强。此外，本文系统地研究了各种反应参数的影响，例如反应时间，催化剂的催化剂和钙化温度的量。此外，M-ZRPW的催化活性高于Sol-Gel方法制备的H-BETA，H-ZSM5和ZRPW。同时，在偶联反应中至少可以重复使用M-ZRPW，而不会显着降低催化活性。

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