助催化剂对Fe_(1-x)O基费-托合成催化剂性能的影响  

Effect of promoters on reaction performance of Fischer-Tropsch synthesis over Fe_(1-x)O-based fused iron catalyst

作　　者：蔡丽萍[1] 刘化章[1] 唐浩东[1] 胡樟能[1] 郑遗凡[1] 黄文宏[1] 杨霞珍[1] 

机构地区：[1]绿色化学合成技术国家重点实验室浙江工业大学工业催化研究所,浙江杭州310014

出　　处：《工业催化》2006年第11期12-16,共5页Industrial Catalysis

摘　　要：考察了助催化剂对Fe（1-x）O基合成熔铁催化剂反应性能的影响，并通过XRD和TPD对催化剂进行表征。结果表明，MnO可以使产物中甲烷选择性降低，低碳烯烃的选择性增加，（CO＋H2）转化率下降。稀土氧化物M2O3（M=La、Nd、Pu等）的加入，产物中甲烷的选择性降低，低碳烯烃的选择性增加，C5^＋选择性增加。对于熔铁催化剂，较少量M2O3（质量分数为0．5％～1．0％）的加入可以使甲烷选择性由21．1％降到14．84％，低碳烯烃收率由31．20g·m^-3升高到40．91g·m^3，C5^＋收率由45．52g·m^-3升高到59．61g·m^-3，但是较多量M2O3（质量分数为1．5％）的加入，（CO＋H2）转化率大幅下降，（CO＋H2）转化率仅为30．29％。XRD结果表明，加入MnO，Mn2^＋部分取代了较大离子半径的Fe^2＋的位置，晶胞参数变大；M2O3的加入，形成了新的晶相。TPD结果表明，低温脱附峰的面积在添加MnO或M22O3后明显减少，催化剂表面活性中心数目减少。The effects of MnO and M2O3 promoters on Fischer-Tropsch synthesis behaviors over Fe（1-x）O-Based fused iron catalyst was investigated by means of CO hydrogenation, XRD and CO-TPD techniques. The results showed that selectivity to methane decreased, CO ＋H2 conversion decreased, and selectivity to light olefins increased with the addition of MnO. Selectivity to methane decreased from 21.18% to 18.84%, light olefins yield remarkably inctwsed from 31.20 g·m^-3 to 40.91 g·m^-3, and C5^＋ yield increased from 45.52 g·m^-3 to 59.61 g·m^-3 with the addition of 0.5% - 1.0wt% rare earth oxide of M203（M= La, Nd, Pu, etc）. However, CO ＋ H2 conversion declined to 30.29% with the addition of 1.5wt% M2O3. XRD results indicated that, with the addition of MnO, Mn^2＋ replaced Fe^2＋ in the lattice of Fe（1- x）O, and lattice parameter of Fe（1-x）O increased. New crystalline phase formed with the addition of M2O3. CO-TPD results indicated that the area of desorption peak observably decreased with the addition of M2O3 or MnO.

关 键 词：F-T合成 氧化锰 稀土氧化物 Fe(1-x)O基熔铁催化剂 

分 类 号：TE665.5[石油与天然气工程—油气加工工程] TQ426.64[化学工程]