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首页> 外文期刊>Journal of industrial and engineering chemistry >Characterizations of Ru/ZnO catalysts with different Ru contents for selective hydrogenation of crotonaldehyde
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Characterizations of Ru/ZnO catalysts with different Ru contents for selective hydrogenation of crotonaldehyde

机译：不同Ru含量的巴豆醛选择性加氢Ru / ZnO催化剂的表征

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摘要

Ru catalysts supported on ZnO with different Ru contents were prepared by an impregnation method and were applied to the vapor-phase selective hydrogenation of crotonaldehyde. The catalysts were characterized by X-ray powder diffraction (XRD), NH3 temperature-programmed desorption (NH3-TPD), transmission electron microscopy (TEM) and temperature-programmed oxidation (TPO). It was found that with increasing Ru contents in the Ru/ZnO catalysts, the activity (TOF), surface acidity amount and deactivation rate increased and the selectivity to crotyl alcohol increased first and then decreased. The 3Ru/ZnO catalyst showed the highest selectivity to crotyl alcohol (up to 88.0%) for the hydrogenation of crotonaldehyde. The initial TOF values of the catalysts depended on the strength of surface acidity and the Ru particle sizes. The more Lewis acid sites made catalysts deactivate more easily. It was assumed that the deactivation was due to the formation of organic compounds deposition and poison effect of CO strongly adsorbed on the Ru atoms.
机译：通过浸渍法制备了负载在不同Ru含量的ZnO上的Ru催化剂，并将其用于巴豆醛的气相选择性加氢。通过X射线粉末衍射（XRD），NH3程序升温脱附（NH3-TPD），透射电子显微镜（TEM）和程序升温氧化（TPO）对催化剂进行了表征。发现随着Ru / ZnO催化剂中Ru含量的增加，活性（TOF），表面酸度数量和失活速率增加，并且对巴豆醇的选择性先升高然后降低。 3Ru / ZnO催化剂对巴豆醛的氢化显示出对巴豆醇的最高选择性（最高88.0％）。催化剂的初始TOF值取决于表面酸性的强度和Ru的粒度。路易斯酸位点越多，催化剂越容易失活。可以认为，失活是由于有机化合物的形成和强烈吸附在Ru原子上的CO的毒害作用所致。

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