摘要
研究了一种改进的脱水方式对费托(F-T)合成铁基催化剂结构性质与催化性能的影响.在n(H2)/n(CO)=0.67,WHSV=1000h-1,p=1.5MPa和t=250oC的条件下对催化剂进行了浆态床F-T合成反应性能评价实验,并采用低温N2物理吸附、X射线衍射、原子发射光谱、X射线光电子能谱、氨程序升温脱附、穆斯堡尔谱和高分辨透射电镜等技术对催化剂进行了表征.结果表明,水处理和二次干燥得到的催化剂比表面积增加,颗粒减小,铁氧化物的分散程度增大,其表面的SiO2/Fe比例明显减小;该催化剂F-T合成反应活性有所增加;表面酸性有所增强,导致烃产物选择性向低碳数方向偏移.
The effects of an improved dehydration way on structural properties and Fischer-Tropsch （F-T） synthesis performance of an iron-based catalyst were studied. The catalytic performance for F-T synthesis was investigated in a continuous stirred tank slurry reactor （CSTR） under the reaction conditions of n（H2）/n（CO） = 0.67, WHSV = 1000 h^-1, p = 1.5 MPa, and t = 250 ℃. The structural properties of the catalysts were characterized by N2 physical adsorption, X-ray diffraction, inductively coupled plasma atomic emission spectroscopy, X-ray photoelectron spectroscopy, NH3 temperature-programmed desorpfion, Mossbauer spectroscopy, and high-resolution transmission electron microscopy The results showed that the BET surface area and α-Fe2O3 dispersion were increased, and the particle size and the surface SiO2/Fe ratio of the catalyst were decreased after water pretreatment and twice drying. The catalyst exhibited high F-T synthesis activity. Moreover, the hydrocarbon selectivity shifted to lower carbon numbers for the catalyst underwent the improved dehydration way, ascribing to its increased surface acidity.
出处
《催化学报》
SCIE
CAS
CSCD
北大核心
2009年第5期465-470,共6页
基金
国家杰出青年科学基金(20625620)
国家自然科学基金(20703054)
关键词
脱水方式
费托合成
铁基催化剂
结构性质
浆态床反应器
dehydration way
Fischer-Tropsch synthesis
iron-based catalyst
structural property
slurry reactor
作者简介
联系人：吴宝山 Tel：（0351）7560668；Fax：（0351）7560668；E-mail：wbs@sxicc．ac．cn
