摘要
本文研究了ZSM-12沸石的合成晶化过程。在不同的投料组成及合成条件下考察了晶化过程中的物相变化。并通过研究晶化过程中固相物质的物相变化规律,探讨了ZSM-12沸石的合成机理。测定了ZSM-12沸石的物理化学性质,并考察了它的催化性质。
The synthesis of ZSM-12 with methyltriethylammonium iodide(MTEAI), tetraethylammonium hydroxide (TEAOH) or tetraethylammonium iodide (TEAI) as organic template and with silica sol as silica source has been systematically studied.The results indicate that the SiO_2/Al_2O_3 tool ratio of starting composition is in the range of 80 to 100 for silica sol——MTEAI system which is broader than that for silica sol TEAOH system (SiO_2/Al_2O_3>100).So is the alkalinity of starting material.In the above synthesis systems, all optinum alkalinity range exists for ZSM-12 synthesis, which is closely related to SiO_2/Al_2O_3 ratio of starting composition.When SiO_2/Al_2O_3 ratio is decreased, higher alkalinity and much more MTEAI (or TEAI) are required for ZSM-12 crystallization.Moreover, the results demonstrated that, with mixed propylene/butylene as feed, H-ZSM-12 catalyst mainly polymerized butylenes.Its activity is lower than that of H-ZSM-5 catalyst, but its selectivity is better.Furthermore, several techniques are used in combination to elucidate the mechanism of ZSM-12 crystallization in silica sol——MTEAI (or TEAOH) system.It is observed that both solid hydrogel transformation and liquid-phase ion migration occur during crystallization.
出处
《石油学报（石油加工）》
EI
CAS
CSCD
北大核心
1992年第1期44-52,共9页
Acta Petrolei Sinica(Petroleum Processing Section)
