摘要
以水热合成法制备了K原位改性的Fe-Mn催化剂,考察了其CO加氢合成低碳烯烃催化活性.采用SEM、TEM、XRD、H2-TPR和FT-IR等手段对催化剂进行了表征.结果表明,制备的催化剂前驱体呈50 ～ 70 nm的球形颗粒,表面富含羰基和羟基,物相组成以Fe3O4为主,用于反应后有Fe5C2和MnCO3相生成.与共沉淀法制备催化剂相比,在设定的反应条件下,不同K含量改性的催化剂均具有较高的活性,以原料配比Fe：Mn∶C6：K=3∶1∶5∶0.10的催化剂性能最佳,CO转化率达95.02％,总低碳烯烃收率为62.86 g/m3（H2＋CO）,CH4和CO2选择性分别为13.88％和13.98％.
A series of potassium modified Fe-Mn catalysts were prepared by hydrothermal method and applied to the catalytic synthesis of light olefins from CO hydrogenation. The catalyst samples were characterized by SEM, TEM, XRD, H2-TPR and PT-IR techniques. Results showed that the prepared sample particles were spherical with 50 - 70 nm size and the carbonyl and hydroxy groups were observed on their surfaces. The bulk composition was mainly Fe3 O4 before the reaction. Fe5 C2 and MnCO3 were formed after the reaction. The prepared samples showed high activity and olefin selectivity under the given reaction conditions. Using the sample S3 （Fe：Mn ：C6 ： K = 3 ： 1：5：0.10）, the CO conversion and the olefin productivity reached 95.02% and 62.86 g/m3 （ Ha ＋CO）, respectively. Compared with the catalyst prepared with co-precipitation method, the S3 catalyst had lower CH4 selectivity（ 13.88% ） and CO2 selectivity（ 13.98% ）.
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2013年第11期1356-1360,共5页
Journal of Fuel Chemistry and Technology
基金
国家重点基础研究发展规划(973计划
2012CB723106)
作者简介
张建利，E-mail：zhangjl@nxu．edu．cn；Fax：0951-2062323．
联系作者：赵天生，E—mail：zhaots@nxu．edu．cn；
