Ru和Cu助剂对费托合成Fe基催化剂反应性能的影响  

Effects of Ru and Cu Promoters on Fischer-Tropsch Synthesis over Fe-Based Catalysts

作　　者：王立丽[1,2] 吴宝山[1] 李永旺[1] 

机构地区：[1]中国科学院山西煤炭化学研究所煤转化国家重点实验室,山西太原030001 [2]中国科学院研究生院,北京100049

出　　处：《催化学报》2011年第3期495-501,共7页

基　　金：国家杰出青年科学基金(20625620);国家自然科学基金(20703054)

摘　　要：研究了Ru和Cu助剂对无K的费托(F-T)合成Fe基催化剂的织构性质、物相结构、还原和碳化行为的影响.在n(H2)/n(CO)=2.0,t=260oC,p=1.5MPa和GHSV=2000h-1的条件下,采用固定床反应器考察了Ru,Cu助剂对Fe基催化剂费托合成反应性能的影响.采用低温N2物理吸附、X射线衍射、穆斯堡尔谱和程序升温还原技术对催化剂进行了详细表征.结果发现,Ru或Cu的添加均提高了铁氧化物的分散度,不同程度地促进了催化剂的还原和碳化,Cu的作用更为显著.反应结果表明,Ru或Cu的添加均提高了催化剂上F-T合成反应活性,其中Cu的添加降低了CH4选择性,促进了C5+的生成;而Ru的作用则相反.The effects of Ru and Cu promoters on the textural properties, phase composition, reduction and carburization behavior, and catalytic performance of Fe-based Fischer-Tropsch synthesis （FTS） catalysts without K promoter were investigated. The catalysts were characterized by N2 physical adsorption, X-ray diffraction, H2 and CO temperature-programmed reduction, MOssbauer effect spectroscopy. The FTS performance of the catalysts was tested in a fixed-bed reactor under the conditions ofn（H2）/n（CO） -- 2.0, t = 260 ℃, p = 1.5 MPa and GHSV = 2000 h-1. The results indicated that both Ru and Cu enhance the dispersion of iron oxides and facilitate the reduction and carburization of the catalysts, which was more obvious for the Cu promoter. Ru and Cu both increase the activity of the catalysts to some extent. Besides, the Cu promoter increased the C5＋ selectivity and hindered the CH4 formation while Ru exhibited the opposite trend.

关 键 词：费托合成 钌 铜 助剂 铁基催化剂 固定床反应器 

分 类 号：O643.36[理学—物理化学]