Constrained Al sites in FER-type zeolites

Design of a Small Organic Template for the Synthesis of Self-Pillared Pentasil Zeolite Nanosheets

“…It is well known that the pyridine-based cations are efficient for directing zeolite structures such as TON, FER (with pentasil layers), FAU, RTH, CLS-1, SOR, and SOV . Accordingly, novel pyridine-based cations were employed as organic templates for the synthesis of pentasil zeolites with controllable morphologies.…”

Preferential population of Al atoms at the T4 site of ZSM-35 for the carbonylation of dimethyl ether

“…Recently, PXRD refinement evidenced a preferred location of Al atoms on the T1 and/or T3 sites (>80%) for a series of FERs (Si/Al = 11–14) that were hydrothermally synthesized using amines as the SDAs. 13 For the ZSM-35-Diox sample, the dense population of Al atoms at the T4 site (55%) demonstrated the unique role of the oxygen-containing SDA in directing the location of Al atoms in the 8-MR pore.…”

“…ZSM-35 is usually synthesized under hydrothermal conditions using N-containing ammonium salts/amines as structure-directing agents (SDAs). 6–13 Tuning the BAS distribution between the micropores is empirically done by selecting suitable SDAs. Using the tetramethylammonium (TMA) cation and pyrrolidine (Pyrr) as the co-SDA densely populated Al atoms in the 8-MR pore, but combining the TMA cation and 1-benzyl-1-methyl pyrrolidinium (Bmp) resulted in a higher density of Al atoms in the 10-MR pore.…”

Organotemplate-free synthesis of Al-rich ZSM-35 and ZSM-22 zeolites with the addition of ZSM-57 zeolite seeds

“…29–31 The Al-rich feature of S-ZSM-35 zeolite would be helpful in generating more acidic sites, which is beneficial to certain catalytic reactions. 32,33…”