Issue 27, 2014

Structural diversity of lamellar zeolite Nu-6(1)—postsynthesis of delaminated analogues

Abstract

Nu-6(1) zeolite, the lamellar precursor of NSI topology, was firstly synthesized with 4′4-bipyridine as the structure-directing agent (SDA) and then subjected to HCl–EtOH treatment for the purpose of structural modification. Interlayer deconstruction and reconstruction took place alternately in this acid treatment. An intermediate named ECNU-4 was separated at the initial stage of this continuous treatment process, which exhibited a special X-ray diffraction pattern without obvious reflection peaks at low angles. The zeolitic structure in the intralayer sheets was supposed to be well preserved in ECNU-4, whereas the interlayer structure became extremely disordered. The ECNU-4 intermediate showed structural diversity. It was converted into the reconstructed and interlayer expanded zeolite IEZ-NSI without an external silicon source by prolonging the HCl–EtOH treatment to 24 h. Moreover, with a partially delaminated structure, ECNU-4 was easily interlayer swollen at room temperature with cetyltrimethyl ammonium bromide in the presence of tetrapropyl ammonium hydroxide. The swollen material was further sonicated to yield a more deeply delaminated zeolite, Del-Nu-6. ECNU-4 and Del-Nu-6 differed in delamination degree, structural disordering and textural properties, especially surface area.

Graphical abstract: Structural diversity of lamellar zeolite Nu-6(1)—postsynthesis of delaminated analogues

Supplementary files

Article information

Article type
Paper
Submitted
14 1 2014
Accepted
20 2 2014
First published
21 2 2014

Dalton Trans., 2014,43, 10492-10500

Author version available

Structural diversity of lamellar zeolite Nu-6(1)—postsynthesis of delaminated analogues

H. Xu, L. Jia, H. Wu, B. Yang and P. Wu, Dalton Trans., 2014, 43, 10492 DOI: 10.1039/C4DT00120F

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