Influence of activated attapulgite on synthesis and pore structure of hierarchical zeolite

Abstract

Hierarchical zeolite was successfully synthesized with activated attapulgite by the template of TEAOH in one pot. The influence of the activated attapulgite on hierarchical pore structure and crystal morphology of products under the different Si/Al ratios was systematically investigated. The results show that there are obvious diversity of the crystal morphology while the different activated palygorskites as precursors; XRD reveal that ZSM-5, ZSM-12 and ZSM-11 molecular sieves are obtained under the same condition when the alkali-roasted and acid-microwaved attapulgite (HM-NC-ATP), acid-microwaved attapulgite (HM-ATP) and acid-hydrothermal attapulgite (HH-ATP) are the precursors, respectively, and the morphology and pore structure of the products are inconsistent at different Si/Al ratios. Moreover, the hierarchy factor (HF) has a good linear dependence on the Si/Al ratio when HM-NC-ATP and HH-ATP are as the precursor; Hierarchical factor of zeolites is 0.105, which are prepared with HM-ATP, exhibiting the mainly mesoporous structure, it shows that the precursor of HM-ATP is beneficial to the formation of mesoporous structure.

Keywords

• activated attapulgite
• tetraethylammonium hydroxide
• hierarchical zeolite
• hierarchical factor