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通过对各种沸石分子筛,Al_2O_3及SiO_2担载的Fe-MnO催化剂上CO加氢反应性能的考察,发现pentasil型沸石担载的Fe-MnO催化剂有良好的低碳烯烃选择性,而其它沸石、SiO_2及Al_2O_3担载的Fe-MnO催化剂则不刊于低碳烯烃的产生。这可能一方面是由于pentasil型沸石担载的Fe-MnO催化剂本身存在着金属与载体间的强相互作用(SMSI)使催化剂有利于烯烃生成,另一方面是由于pentasil型沸石独特的孔道有利于低碳烯烃的及时扩散离去,抑制了低碳烯烃在金属活性中心上的二次反应。研究还表明,催化剂活性与α-Fe°及反应过程中生成的∑-Fe2.2C和∑′-Fe2.2C含量存在对应关系。
Through examining the performance of CO hydrogenation on Fe-MnO catalysts supported on various zeolite, Al 2 O 3 and SiO 2 catalysts, it was found that the pentasil-type zeolite supported Fe-MnO catalyst has good selectivity to light olefins, while other zeolites, The Fe-MnO catalysts supported on SiO 2 and Al 2 O 3 are not reported in the production of light olefins. This may be partly due to the presence of a strong metal-to-support interaction (SMSI) on the pentasil-type zeolite supported Fe-MnO catalyst, which makes the catalyst favorable for the olefin production. On the other hand, the unique pore of the pentasil- The timely diffusion of low-carbon olefins left and inhibited the secondary reaction of lower olefins on the active center of the metal. The study also showed that there is a corresponding relationship between the catalytic activity and α-Fe ° and Σ-Fe2.2C and Σ’-Fe2.2C contents generated during the reaction.