CAJ | 학술논문

在SiO2-Al2 O3-K2 O-DAH-H2 O（1，6-己二胺，DAH）体系中，研究水热合成条件对ZSM-22沸石相对结晶度和相纯度的影响。采用X射线衍射（XRD）和电感耦合等离子体（ICP）技术表征合成产物的结构、物相及化学组成。结果表明，合成胶 n（SiO2）/n（Al2 O3）在80～110，n（OH -）/n（SiO2）在0．33～0．35和433～438 K条件下，合成出系列相纯度较高的ZSM-22沸石。产物相对结晶度和相纯度依赖于合成胶硅铝物质的量比、碱度和晶化温度。适当升高晶化温度有利于提高产物的相纯度和相对结晶度；n（SiO2）/n（Al2 O3）在80～110之外，合成胶硅铝物质的量比的降低或提高分别导致ZSM-5或方石英相分率的逐渐增加。此外，纯ZSM-22骨架 n（Si）/n（Al）分布于41．8～53．4；与 n（SiO2）/n（Al2 O3）关联可知，n（Si）/n（Al）比值向该区间中心呈收敛趋势。
재SiO2-Al2 O3-K2 O-DAH-H2 O（1，6-기이알，DAH）체계중，연구수열합성조건대ZSM-22비석상대결정도화상순도적영향。채용X사선연사（XRD）화전감우합등리자체（ICP）기술표정합성산물적결구、물상급화학조성。결과표명，합성효 n（SiO2）/n（Al2 O3）재80～110，n（OH -）/n（SiO2）재0．33～0．35화433～438 K조건하，합성출계렬상순도교고적ZSM-22비석。산물상대결정도화상순도의뢰우합성효규려물질적량비、감도화정화온도。괄당승고정화온도유리우제고산물적상순도화상대결정도；n（SiO2）/n（Al2 O3）재80～110지외，합성효규려물질적량비적강저혹제고분별도치ZSM-5혹방석영상분솔적축점증가。차외，순ZSM-22골가 n（Si）/n（Al）분포우41．8～53．4；여 n（SiO2）/n（Al2 O3）관련가지，n（Si）/n（Al）비치향해구간중심정수렴추세。
The effect of hydrothermal synthesis conditions on both relative crystallinity and phase purity of ZSM-22 zeolites was investigated in SiO2-Al2 O3-K2 O-DAH-H2 O system , hereby DAH referring to 1 ,6-diaminohexane as template . The resulting samples were characterized by powder X-ray diffraction (XRD) and inductively coupled plasma (ICP) analyses in order to examine the structure ,XRD phase ,and chemical composition .As a result ,several ZSM-22 zeolites with the higher phase purity were synthesized at respective temperatures from 433 K up to 438 K by use of the different gels which involved SiO2/Al2 O3 molar ratios of 80~100 and OH - /SiO2 molar ratios of 0 .33~0 .35 .It is found that the relative crystallinity and phase purity of ZSM-22 zeolites markedly varied as a function of crystallization temperature ,SiO 2/Al2 O3 and OH - /SiO2 molar ratios . In fact , an adequate increase in crystallization temperature improves on ZSM-22 phase purity , followed a significant enhancement of relative crystallinity .Although the ZSM-5 crystal growth takes place predominantly in the solid phase ,the decrease in the range of SiO2/Al2 O3 ratio less than 80 leads to a gradual increase in the ZSM-5 phase fraction while the increase in SiO2/Al2 O3 ratio larger than 110 also enhances the phase fraction of cristobalite .Furthermore ,Si/Al atomic ratios in ZSM-22 framework located the range of 41 .8~53 .4 ,and by correlating the Si/Al ratio of ZSM-22 framework with the SiO2/Al2 O3 ratio of alumino-silicate gels ,it is noted that the nominal ratios in ZSM-22 framework tended to shift towards the center of the Si/Al ratio interval mentioned above .