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首页> 外文期刊>Physical chemistry chemical physics: PCCP >Keggin heteropolyacid H3PW_(12)O_(40) supported on different oxides for catalytic and catalytic photo-assisted propene hydration
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Keggin heteropolyacid H3PW_(12)O_(40) supported on different oxides for catalytic and catalytic photo-assisted propene hydration

机译：负载在不同氧化物上的Keggin杂多酸H3PW_（12）O_（40）用于催化和催化光助丙烯水合

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摘要

Catalytic and catalytic photo-assisted hydration of propene to form 2-propanol in gas-solid regime at atmospheric pressure and 85 °C were carried out by using a heteropolyacid (POM) supported on different oxides. Binary materials were prepared by impregnation of H3PW_(12)O_(40) on different commercial and home prepared supports (TiO2, SiO2, WO3, ZrO2, ZnO, Al2O3). Some of the composites were active both for catalytic and catalytic photo-assisted reactions. The Keggin type POM was completely and partially degraded, when supported on ZnO and Al2O3, respectively, and these binary solids always resulted as inactive for both catalytic and catalytic photo-assisted reactions. The supported Keggin POM species played a key role both for the catalytic and the photo-assisted catalytic reactions, due to their strong acidity and ability to form strong oxidant species under UV irradiation, respectively. The contemporary presence of heat and UV light improved the activity of almost all POM supported materials. All materials were characterized by X-ray diffraction (XRD), scanning electron microscopy observations (SEM), diffuse reflectance spectroscopy (DRS), determination of the conduction and valence band energy by photo-voltage measurements, Fourier transform infrared spectroscopy (FTIR), NH3-TPD experiments and time resolved microwave conductivity (TRMC).
机译：通过使用负载在不同氧化物上的杂多酸（POM），在大气压力和85°C的条件下，进行气固状态下的丙烯催化光催化水合形成2-丙醇。通过将H3PW_（12）O_（40）浸渍在不同的商业和自制载体（TiO2，SiO2，WO3，ZrO2，ZnO，Al2O3）上来制备二元材料。一些复合材料对催化和催化光辅助反应均具有活性。当分别负载在ZnO和Al2O3上时，Keggin型POM完全或部分降解，并且这些二元固体总是对催化和催化光助反应均无活性。负载的Keggin POM物种分别对它们的强酸性和在紫外线照射下形成强氧化剂的能力，在催化反应和光辅助催化反应中均起着关键作用。当代热和紫外线的存在改善了几乎所有POM支撑材料的活性。所有材料的特征在于X射线衍射（XRD），扫描电子显微镜观察（SEM），漫反射光谱（DRS），通过光电压测量确定导带和价带能，傅立叶变换红外光谱（FTIR）， NH3-TPD实验和时间分辨微波电导率（TRMC）。

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