不同分子筛载体对CO加氢产物分布的影响

EFFECT OF DIFFERENT ZEOLITE SUPPORTS ON THE PRODUCT DISTRIBUTION OF CO HYDROGENATION

研究了几种小孔分子筛ＺＳＭ５，ＨＹ，ＮａＹ及β担载ＺｒＯ２对ＣＯ加氢反应的催化作用，并就产物的分布情况与担载ＺｒＯ２的硅铝中孔分子筛进行了对比研究．其中中孔分子筛分别用季铵盐和一级胺为模板剂，在水热条件和常温常压下合成；并用ＢＥＴ，ＸＲＤ，ＳＥＭ等手段表征了它们的孔道和骨架结构．另外，考察了碱金属Ｋ＋，Ｎａ＋对催化剂催化性能的影响．

Different kinds of zeolites, such as ZSM 5, β, HY, NaY, Al MCM 41, MCM and HMS, were used as catalyst supports for CO hydrogenation. The product distribution over these catalysts was compared. The results show that the performance of different catalysts depends on the characteristics of the supports. The selectivity for i C 0 4 on ZrO 2/ZSM 5, ZrO 2/β and ZrO 2/HY is much higher than that on ZrO 2/MCM, ZrO 2/Al MCM 41 and ZrO 2/HMS, but C = 2～C = 4 produced on the latter catalysts are much higher than those on the formers. The selectivity for i C 0 4 and i C = 4 is sensitive to the acidity of the catalysts. Potassium and sodium influence the reaction selectivity for isobutane and isobutene through changing the acidity of the catalysts. The electronic effect of alkali metals enhances the reaction activity, and their basicity promotes the reaction selectivity for C = 2～C = 4.