Activation of ZrO(2)-WO(3) solid acid catalysts in a Friedel-Crafts reaction through post-hydrothermal treatment.
Activation of ZrO(2)-WO(3) solid acid catalysts in a Friedel-Crafts reaction through post-hydrothermal treatment.
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ZRO（2）的激活（3）通过热热后处理中弗里德尔工艺反应中的固体酸催化剂。
作者：
ZrO 2-WO 3复合氧化物在化工和石油工业中起着重要的作用。到目前为止，很少有工作关注的ZrO 2-WO 3催化剂的低活性的活化。在这项工作中，反应性差的ZrO 2-WO 3作为模型催化剂制备的溶胶-凝胶法，它是伴随着后水热处理与各种解决方案。苯甲醚和苯甲醇的傅克反应催化结果表明，用乙二胺或氢氧化铵溶液进行水热后处理可以显着提高ZrO 2-WO 3的活性，而用水或氯化氨溶液进行水热处理则会导致活性和选择性较差。发现前处理诱导ZrO 2晶体从单斜晶系到四斜晶系的巨大转变以及锚定到ZrO 2上的酸性WOx簇的显著增加。WOx团簇的生成是ZrO 2-WO 3活化的主要原因。水热处理后的高pH值诱导了酸性WOx簇活性中心的产生。
ZrO2–WO3 mixed oxide plays an essential role in the chemical and petroleum industries. So far, very little work has paid attention to the activation of the low activity of ZrO2–WO3 catalysts. In this work, poorly reactive ZrO2–WO3 was prepared as a model catalyst by a sol–gel method and it was accompanied by post-hydrothermal treatment with various solutions. The catalytic results in the Friedel–Crafts reaction of anisole and benzyl alcohol showed that the post-hydrothermal treatment with ethylenediamine or ammonium hydroxide solutions dramatically improved the activity of ZrO2–WO3, while the hydrothermal treatments with water or ammonia chloride solution resulted in poorer activity and selectivity. The former treatments were found to induce a huge transformation of the ZrO2 crystal from monoclinic to tetragonal as well as a significant increase in acidic WOx clusters that anchored onto ZrO2. The generation of the WOx clusters was responsible for the activation of ZrO2–WO3. The high pH value of the post-hydrothermal treatment induces the generation of acidic WOx cluster active sites.
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影响因子：
7.3
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