硅沸石-1的合成及催化作用

SYNTHESIS AND CATALYTIC PROPERTIES OF SILICALITE1

首次在吸附态模板剂作用下的Ｎａ２ＯＳｉＯ２ＥＤＡ（乙二胺）干粉体系中合成了硅沸石１（ｓｉｌｉｃａｌｉｔｅ１），利用ＸＲＤ、ＳＥＭ、ＩＲ等分析方法对沸石的结构、形貌、骨架振动、稳定性及催化性能进行了表征。结果表明，与水热体系合成的硅沸石１相比，干法合成的沸石样品的晶胞体积出现扩张的趋势。另外，与水热体系及非水体系中得到的ＺＳＭ５沸石相比较，在合成气制备低碳烯烃反应中，干法得到的硅沸石１表现优良的催化性能，其ＣＯ转化率和Ｃ２～Ｃ４烯烃选择性分别为８５．５％和４７．７％。

It was the first time that a silicalite1 was synthezied from a dry powder system of Na 2OSiO 2EDA (ethylenediamine) with template EDA in an adsorbed state The physicochemical properties, including structure, morphology, framework vibration, stability and catalytic properties were characterized by means of XRD, SEM, IR and so on The results showed that the unit cell volume of silicalite1 prepared by dry method was larger than that of silicalite1 synthesized hydrothermally The thermal stability and resistance to acids were satisfying, while its resistance to bases was comparatively poor Compared with zeolite ZSM5 prepared in hydrothermal system or nonaqueous system, the silicalite1 synthesized in dry powder system exhibited better catalytic properties in the synthesis of light olefins from CO hydrogenation, with the CO conversion of 85 5% and C 2￣C 4 olefins selectivity of 47 7%