作　　者： ; ; ; ; ; ;

机构地区： 中国科学院过程工程研究所

出　　处： 《过程工程学报》 2009年第6期1178-1185,共8页

摘　　要： 采用浸渍法制备了合成气直接制取低碳烯烃的铁基负载型催化剂,在固定床反应器中考察了载体、助剂、焙烧温度及反应温度与压力、原料气空速对催化性能的影响,并对其进行了表征.结果表明,焙烧温度对催化剂活性有重要影响,FeK/ZSM-5催化剂经500℃焙烧3h后具有最佳的催化活性,提高反应压力可明显提高活性,而增加原料气空速活性明显降低;添加助剂K和Mn明显提高了催化剂的低碳烯烃选择性,在H2/CO=2(φ)、反应温度380℃、压力1.0MPa、原料气空速4400h-1条件下,FeMnK/ZSM-5可将CO转化率从Fe/ZSM-5催化剂的18.7%升至63.8%,C2=～C3=选择性从4.8%升至14.1%. The supported iron-based catalysts for the conversion of synthesis gas to light olefins were prepared by impregnation method and the effects of parameters, such as carrier, promoter, calcination temperature, reaction temperature, reaction pressure and space velocity, on the reaction were investigated in a fixed-bed reactor. The catalysts were characterized by XRD, N2 physisorption, thermo gravimetric analysis and Raman spectroscopy. The results indicated that FeK/ZSM-5 catalyst prepared by calcination at 500 ℃ after 3 h had the best catalytic activity. Increasing reaction pressure and decreasing space velocity, the activity of catalyst was all obviously improved. Using ZSM-5 as the carrier, the comparable catalytic performance of adding K and Mn promoters were studied. The results showed that FeMnK/ZSM-5 catalyst improved the CO conversion rate from 18.7% to 63.8%, and C2=-C3- selectivity from 4.8% to 14.1% contrast to Fe/ZSM-5 catalyst under the conditions of volume ratio of H2 to CO2, reaction temperature 380 ℃, reaction pressure 1.0 MPa and space velocity 4400 h^-1.

关 键 词： 合成气 低碳烯烃 铁基催化剂 载体 助剂

领　　域： [理学] [理学]