MOF-Derived Tungstated Zirconia as Strong Solid Acids toward High Catalytic Performance for Acetalization.
MOF-Derived Tungstated Zirconia as Strong Solid Acids toward High Catalytic Performance for Acetalization.
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DOI：
10.1021/acsami.6b08057
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发表时间：
2016-09
影响因子：
9.5
通讯作者：
Peng Wang;Jian Feng;Yupei Zhao;Shaobin Wang;Jian Liu
中科院分区：
文献类型：
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作者：
Peng Wang;Jian Feng;Yupei Zhao;Shaobin Wang;Jian Liu
首次以钨酸盐固载的UiO-66为前驱体，采用“双溶剂”浸渍法，在温和的煅烧温度下制备了一种强固体酸钨酸化氧化锆（WZ）。在W含量适中的情况下，合成的WZ催化剂具有较高的酸中心密度，适当的热处理也容易在稳定的四元ZrO 2上形成一束低聚的钨簇。与传统的氢氧化锆制备的WZ相比，该固体酸对苯甲醛的缩醛化反应具有更好的催化性能。值得注意的是，由于大的表面积和另外引入的强酸位点，MOF衍生的WZ催化剂提供高达86.0%的转化率。该方法简单易行，使WZ催化剂具有上级催化活性和良好的可循环性，为金属氧化物基固体超强酸和超强碱的制备开辟了一条新的途径。
A strong solid acid, tungstated zirconia (WZ), has been prepared first using tungstate immobilized UiO-66 as precursors through a "double-solvent" impregnation method under mild calcination temperature. With moderate W contents, the as-synthesized WZ catalysts possess a high density of acid sites, and the proper heat treatment also has facilely led to a bunch of oligomeric tungsten clusters on stabilized tetragonal ZrO2. The resultant solid acids show an improved catalytic performance toward the benzaldehyde's acetalization in comparison with traditional zirconium hydroxide-prepared WZ. Notably, due to large surface area and additionally introduced strong acid sites, the MOF-derived WZ catalysts afforded conversion up to 86.0%. The facile method endows the WZ catalysts with superior catalytic activities and excellent recyclability, thus opening a new avenue for preparation of metal oxide-based solid superacids and superbases.