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Title: Broadening the Scope for Fluoride‐Free Synthesis of Siliceous Zeolites

Journal Article · · Angewandte Chemie (International Edition)
ORCiD logo [1];  [1];  [2];  [3]; ORCiD logo [1]
  1. Department of Chemical Engineering University of Massachusetts Amherst 686 N Pleasant St Amherst MA 01003 USA
  2. Department of Polymer Science &, Engineering University of Massachusetts Amherst 120 Governor's Dr Amherst MA 01003 USA
  3. Department of Chemical Engineering University of Massachusetts Amherst 686 N Pleasant St Amherst MA 01003 USA, School of Chemical Engineering Northwest University Xi'an Shanxi 710069 China
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Abstract Siliceous zeolites are ideally suited for emerging applications in gas separations, sensors, and the next generation of low‐ k dielectric materials, but the use of fluoride in the synthesis significantly hinders their commercialization. Herein, we show that the dry gel conversion (DGC) technique can overcome this problem. Fluoride‐free synthesis of two siliceous zeolites—AMH‐4 (CHA‐type) and AMH‐5 (STT‐type), has been achieved for the first time using the method. Siliceous *BEA‐, MFI‐, and *MRE‐type zeolites have also been synthesized to obtain insights into the crystallization process. Charge‐balancing interactions between the inorganic cation, organic structure‐directing agent (OSDA), and Si−O − defects are found to be an essential aspect. We quantify this factor in terms of the “OSDA charge/silica ratio” of the as‐made zeolites and demonstrate that the DGC technique is broadly applicable and opens up new avenues for fluoride‐free siliceous zeolite synthesis.

Sponsoring Organization:
USDOE
OSTI ID:
1422019
Journal Information:
Angewandte Chemie (International Edition), Journal Name: Angewandte Chemie (International Edition) Vol. 57 Journal Issue: 14; ISSN 1433-7851
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English
Citation Metrics:
Cited by: 52 works
Citation information provided by
Web of Science

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