Synthesis of Hierarchical SAPO-11 using Phosphoric Acid-treated Aluminosilicate Zeolite as Precursor

摘要

Hierarchical SAPO-11 was synthesized using phosphoric acid-treated alum inosilicate zeolite as precursor without additional mesoscale templates. The sample was characterized by XRD, nitrogen adsorption-desorption, SEM, TEM, and MAS NMR. The results showed that the alum inosilicate zeolite was decomposed and transformed into hierarchical SAPO-11 after the treatment of phosphoric acid and hydrothermal crystallization. The obtained sample exhibited irregular aggregation of small crystals with rough surface and mesoporous structure. The formation mechanism of the mesoporous in this process was proposed based on analysis results.