The Effect of Ferrierite Zeolites Doped ZSM-23 on the Isomerization Selectivity of n-butene to Isobutene
- 化学化工－已发表论文 
用 ＸＲＤ和氨ＴＰＤ对镁碱沸石合成物（记为 ＦＥＲ（Ｚ），下同）的表征显示，这种合成物掺杂了少量的ＺＳＭ－２３分子筛，与纯的镁碱沸石（记为ＦＥＲ（Ｆ），下同）相比较，具有稍低的正丁烯异构化转化率和较高的异丁烯选择性，其得率稍低于ＦＥＲ（Ｆ）．将ＦＥＲ（ｚ）与γ－Ａｌ２Ｏ３以不同比例混合后，随着 γ－Ａｌ２Ｏ３增加正丁烯异构化的转化率降低，而选择性提高．催化剂失效后，在 ７７３ Ｋ空气流中加热２ ｈ，催化活性能得到部分恢复．这些结果表明，少量ＺＳＭ－２３的掺杂、γ－Ａｌ２Ｏ３沉积以及反应过程中的积炭修饰了镁碱沸石分子筛的孔道结构，从而影响催化剂的正丁烯异构化催化反应性能．The characterization of the synthetics with both XRD and NH3-TPD showed that ferrierite (FER (F) ) was doped by a little amount of ZSM-23. Determiantions of conversion, selectivity and yield for isomerization of n-butene to isobutene on Ferrierite doped a little of ZSM-23 (FER(Z) ) indicated that the conversion on FER(Z) was lower and the selectivity became higher in contrast with that of the FER(F). But the yield was slightly lower than that on the FER(F). The catalytic behavior for isomerization of n-butene to isobutene on the FER(Z) mixed with γAl2O3 in the various ratios were also investigated. The results showed that the conversion of nbutene decreased whereas the selectivity increased as the adding amount of γ-Al2O3 in catalysts increased gradually. The catalytic activity can be partly recovered by oxidation in stream of air at 773 K for 2 h. These results showed that the catalytic activity for isomerization of n-butene over H-FER(Z) or FER(Z)/ γ-Al2O3 is effected by the micropore structure.