Zirconia/Silica Sol−Gel Catalysts: Effect of the Surface Heterogeneity on the Selectivity of 2-Propanol Decomposition†
Zirconia/Silica Sol−Gel Catalysts: Effect of the Surface Heterogeneity on the Selectivity of 2-Propanol Decomposition†
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DOI：
10.1021/la9508046
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发表时间：
1997-03
期刊：
影响因子：
3.9
通讯作者：
R. Gómez;T. López;F. Tzompantzi;E. Garcíafigueroa;D. Acosta;O. Novaro
中科院分区：
文献类型：
--
作者：
R. Gómez;T. López;F. Tzompantzi;E. Garcíafigueroa;D. Acosta;O. Novaro
氧化锆/二氧化硅混合氧化物通过溶胶-凝胶法在pH 3和9下使用四乙氧基硅烷和乙酸锆以1.3、4.0和6.7重量% ZrO 2制备。在酸性制剂中，获得高比BET面积。2-使用丙醇分解作为反应试验。发现对丙烯或丙酮的选择性是制备介质的函数。在酸性制备中，酸性位点被开发出来，并观察到对丙烯的高选择性;建议在本体和表面形成Zr−O−Si键。相反，在基础制剂中，主要产物是丙酮。在这种情况下，提出了Zr-O-Si键和纯ZrO 2沉积在二氧化硅表面上的形成。
Zirconia/silica mixed oxides were prepared by the sol−gel method at pH 3 and 9 using tetraethoxysilane and zirconium acetate at 1.3, 4.0, and 6.7 wt % ZrO2. In acidic preparations, high specific BET areas were obtained. 2-Propanol decomposition was used as the reaction test. It was found that the selectivity to propene or acetone is a function of the preparation medium. In acidic preparations, acid sites were developed and high selectivity to propene was observed; formation of Zr−O−Si bonds in bulk and surface was suggested. By the contrary in basic preparations, the main product was acetone. In such a case the formation of Zr−O−Si bonds and pure ZrO2 deposited on the silica surface is proposed.