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采用红外光谱研究了CO在担载于Al_2O_3上的氧化态和还原态Pd与Pt及Pd-Pt双金属催化剂上的吸附态和吸脱附行为。吸附速度和升温脱附试验结果表明,CO在担载Pd上先出现桥式吸附态而后出现线式吸附态,前者不易脱附而后者极易脱附。CO在PdO上的吸附趋于饱和时,出现1995cm~(-1)的弱吸收带。CO在担载Pt上以线式吸附态为主而不易脱附。在Pd-Pt双金属催化剂上CO的吸脱附行为与Pd/Pt比有着密切关系。讨论了氧化作用、Pd/Pt比对CO吸脱附性质的影响。
The adsorption state and adsorption-desorption behavior of CO on oxidized and reduced Pd and Pt and Pd-Pt bimetallic catalysts supported on Al 2 O 3 were studied by infrared spectroscopy. Adsorption velocity and temperature-dependent desorption test results show that the first adsorbed state of CO appears on the supported Pd and then linear adsorption state, the former is not easy to desorption and the latter is easy to desorption. When the adsorption of CO on PdO tends to be saturated, a weak absorption band of 1995 cm -1 appears. CO is mainly adsorbed on the Pt linear adsorption state but not easy to desorption. The adsorption and desorption behavior of CO on the Pd-Pt bimetallic catalyst is closely related to the Pd / Pt ratio. The effects of oxidation and Pd / Pt ratio on the adsorption and desorption properties of CO were discussed.