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利用原位红外光谱方法研究了CO在浸渍制得的1%Ru/X(D_(Ru):40—60)上的化学吸附(X为SiO_2,Al_2O_3,SiO_2-Al_2O_3,HY分子筛)。发现室温吸附 CO时,当载体由 SiO_2→Al_2O_3→SiO_2-Al_2O_3→HY时,吸附态 CO谱带蓝移,高频谱带相对强度增加,吸附温度改变时,相当于 Ru~(δ+)(CO)_4的多重吸附态(～2155cm~(-1),～2100cm~(-1)…)在Ru/HY,Ru/SiO_2-Al_2O_3及Ru/Al_2O_3上出现的温度分别为室温、150℃及350℃.在Ru/SiO_2上任何温度下都不出现,认为载体的酸性对高分散Ru和载体间的相互作用有明显影响。
The chemisorption of CO on 1% Ru / X (D_ (Ru): 40-60) prepared by impregnation was studied by in situ FTIR spectroscopy (X is SiO_2, Al_2O_3, SiO_2-Al_2O_3, HY). It is found that when the carrier is from SiO 2 → Al 2 O 3 → SiO 2 -Al 2 O 3 → HY, the CO band shifts blue and the relative intensity of the high frequency band increases when the carrier adsorbs CO at room temperature. When the adsorption temperature changes, it is equivalent to Ru ~ (δ +) (CO (~ 2155cm -1, ~ 2100cm -1) ...) at Ru / HY, Ru / SiO_2-Al_2O_3 and Ru / Al_2O_3 are room temperature, 150 ℃ and 350 ℃ .At the same time, Ru / SiO 2 did not appear at any temperature. It is considered that the acidity of the support had a significant effect on the interaction between the highly dispersed Ru and the support.