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本文用红外光谱法研究了平均晶粒大小对CO在Ru/Al_2O_3上吸附态的影响。发现在大晶粒的Ru/Al_2O_3上只有一种线式CO吸附态,而在小晶粒的Ru/Al_2O_3上可存在R_u~(+δ)(CO_4)吸附态、孪生CO吸附态、线式CO吸附态、μ-桥式CO吸附态。在小晶粒Ru/Al_2O_3上的线式CO吸附态比大晶粒Ru/Al_2O_3上的线式CO吸附态稳定,并且预抽空温度对CO吸附态有明显的影响。上述现象认为是由于Ru与Al_2O_3间相互作用随D_(Ru)。变小而加强导致形成不同程度的缺电子Ru中心所致。
In this paper, the influence of average grain size on the adsorption of CO on Ru / Al_2O_3 was studied by infrared spectroscopy. It is found that there is only one linear CO adsorbed state on the Ru / Al_2O_3 with large grain size and the R_u ~ (+ δ) (CO_4) adsorbed state, the twin CO adsorbed state, the linear CO adsorption state, μ-bridge CO adsorption state. The linear CO adsorption state on Ru / Al_2O_3 with small grain size is more stable than the linear CO adsorption state at large grain Ru / Al_2O_3, and the pre-evacuating temperature has a significant effect on the CO adsorption state. The above phenomenon is believed to be due to the interaction between Ru and Al 2 O 3 with D_ (Ru). Smaller and stronger led to the formation of varying degrees of electron-deficient Ru center.