Catalyst design of Pt/TiO2 microsphere for benzene oxidation under microwave irradiation
Catalyst design of Pt/TiO2 microsphere for benzene oxidation under microwave irradiation
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DOI：
10.1016/j.cattod.2020.05.021
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发表时间：
2020-05
期刊：
影响因子：
5.3
通讯作者：
Xin Liu;Siyu Ding;Saki Shigenobu;H. Hojo;H. Einaga
中科院分区：
文献类型：
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作者：
Xin Liu;Siyu Ding;Saki Shigenobu;H. Hojo;H. Einaga
采用水热法制备了具有海胆状结构的Pt/TiO 2微球，并对TiO 2进行了预热，在TiO 2表面沉积Pt纳米粒子，然后在O2/N2和H2中进行后热处理。采用XRD、拉曼、SEM、TEM和N2吸附等手段对催化剂进行了表征。制备的TiO 2微球平均粒径约为250 nm。TiO 2微球由粒径为20 - 30 nm的TiO 2纳米颗粒组成。通过液相吸附法将粒径为3 nm的Pt颗粒高度分散在TiO 2微球上。在Pt沉积之前和之后在300 °C下加热TiO 2没有改变TiO 2微球的尺寸，并且表面积从238 m2 g-1减少到137 m2 g-1。在常温加热条件下，Pt/TiO 2微球比Pt/TiO 2 P25具有更高的催化活性，而纯TiO 2几乎没有催化活性。在微波加热条件下，以活性炭为催化剂，Pt/TiO 2微球为催化剂进行催化反应。Pt/TiO 2与活性炭的混合物在微波辐射下的苯氧化活性高于常规外加热下的苯氧化活性。将该混合物应用于苯吸附-催化氧化组合工艺。
Pt/TiO2microspheres with sea-urchin like structures were prepared by sequential processes including the preparation of TiO2by a hydrothermal method and the preheating of the TiO2, the deposition of Pt nanoparticles on the TiO2surface, followed by post heating in O2/N2and H2. The TiO2and Pt/TiO2catalysts were characterized by XRD, Raman, SEM, TEM and N2adsorption studies. The average diameter of TiO2microspheres was about 250 nm. The TiO2microspheres were composed of TiO2nanoparticles with the size of 20−30 nm. Pt particles with the size of 3 nm were highly dispersed on the TiO2microsphere by liquid phase adsorption of colloidal Pt particles. The heating of TiO2at 300 °C before and after the Pt deposition did not change the size of TiO2microsphere and reduced the surface area from 238 to 137 m2g−1. The Pt/TiO2microsphere exhibited higher catalytic activity for benzene oxidation than Pt/TiO2P25 under normal outer heating, whereas pristine TiO2exhibited almost no activity. Activated carbon was used as a catalyst with a mixture of Pt/TiO2microspheres when performing the catalytic reaction under microwave heating. The mixture of Pt/TiO2and activated carbon showed higher benzene oxidation activity under microwave irradiation than under normal external heating. The mixture was applied to benzene adsorption-catalytic oxidation combined processes.