利用傅立叶变换红外光谱,研究真空条件(87.78 kPa,353 K)下肉桂醛在γ-Al2O3、La2O3和La2O3/γ-Al2O3样品表面的吸附情况,并根据文献归属了肉桂醛吸附在这些氧化物表面的红外吸收峰.结果表明,肉桂醛在氧化物表面产生多部位吸附.吸附在La2O3/γ-Al2O3样品的肉桂醛分子的1 496 cm-1和1 388 cm-1红外吸收峰强度高于其吸附在γ-Al2O3对应的红外吸收峰强度,说明La2O3/γ-Al2O3样品对应于该吸收的碱点数量多于γ-Al2O3样品,肉桂醛在氧化物表面吸附可能生成Ar-CH=CH-COO-表面物种(υ=1 410 cm-1).%The adsorption of cinnamaldehyde on γ-Al2O3, La2 O3 and La203/γ-A1203 wass investigated by FT-IR technique under vacuum condition ( 87.78 kPa,353 K). According to the relative literature, the infrared spectroscopy adsorption bands of cinnamaldehyde adsorbed on the three oxide surfaces were assigned. The results indicated that cinnamaldehyde was adsorbed in multi-spots on the surfaces of the oxides;the intensity of 1 496 cm-1, 1 388 em-1 characteristic adsorption bands of einnamaldehyde adsorbed on La2O3/γ-A12O3 was higher than that on γ-A1203, which showed that the quantity of alkali points on La2O3/γ-Al2O3 was more than those on γ-A12O3. Cinnamaldehyde adsorbed on the surfaces of oxides could produce the surface species Ar—CH=CH—COO- (v = 1 410 em-1 ).
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