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采用原位红外光谱技术研究了担载于TiO_2、SiO_2和Al_2O_3上的Pt_2Co_2(μ-CO)_3(CO)_5(PPh_3)_2异核金属簇络合物在真空和空气中的脱羰基作用,结构变化过程及由此制得的分散型金属催化剂上CO的吸附态.结果表明,该金属簇络合物在担载后其结构没有发生明显变化.担载在TiO_2上的络合物在真空中加热时,随温度升高逐渐脱去羰基,其中桥羰基更易脱去,在100℃时便完全脱除,而端羰基在200℃时才完全脱除.样品完全脱羰基后可成为具有吸附CO能力的分散型铂金属催化剂,吸附的CO以线式存在,而且在真空中可逆吸附.
In situ FTIR spectroscopy was used to study the decarbonylation of Pt 2 Co 2 (μ-CO) _3 (CO) _5 (PPh_3) _2 heteronuclear metal complexes supported on TiO_2, SiO_2 and Al_2O_3 in vacuum and air. Structure change process and the adsorption state of CO on the dispersed metal catalyst obtained by the method.The results showed that the structure of the metal cluster did not change significantly after supported.The complex supported on TiO_2 In heating, the carbonyl group is gradually decayed with increasing temperature, in which case the carbonyl group of the bridge is easier to be removed and completely removed at 100 ° C, while the terminal carbonyl group is completely removed at 200 ° C. CO-dispersible platinum metal catalyst, adsorbed CO exists in a linear manner, and reversibly adsorbs in a vacuum.