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Structural and compositional studies of crystalline MAPO molecular sieves formed in ionothermal synthesis using imidazolium bromides

Benin, Annabelle I. and Hwang, Son-Jong and Zones, Stacey I. and Xie, Dan and Chaudhuri, Kaustav and Lacheen, Howard (2019) Structural and compositional studies of crystalline MAPO molecular sieves formed in ionothermal synthesis using imidazolium bromides. Microporous and Mesoporous Materials, 274 . pp. 257-265. ISSN 1387-1811. http://resolver.caltech.edu/CaltechAUTHORS:20180803-101939156

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Abstract

In this contribution, we extend some of the explorations in using ionic liquids as both solution media and organic–guest contributors to the eventual crystallizing structure, when attempts are made synthesize MAPO molecular sieves. We synthesize a family of imidazolium bromides for this purpose and demonstrated a trend toward increasing substituent length on the nitrogen sites. These materials are run as reaction systems using 5 inorganic situations: metals Ni, Zn, Co and Mg substituting in part for Al, and then a 5th reaction where there is no metal added. A variety of MAPO products are made and there are some correlati ons for the size of the imidazolium guest and the internal void space of the microporous material. Further analysis of some of the details of the products was carried out using solid state MAS NMR and focusing on Al, P and F nuclei in the products. There are some interesting observations found as to deviation from simple tetrahedral coordination for the Al and P, depending upon the imidazolium guest and the metal incorporated. Then, more attention was also focused on the reactions for Ni where once the guests became large enough the products seemed to be the 12-ring structure AFI which has parallel one dimensional pores. It seemed to be that the Ni is not able to be part of the lattice in these instances, and in fact, AFI is the product for a variety of the larger imidazolium guest molecules in the reaction run without any metal added for substitution.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.micromeso.2018.07.052DOIArticle
ORCID:
AuthorORCID
Hwang, Son-Jong0000-0002-3210-466X
Xie, Dan0000-0003-2467-976X
Additional Information:© 2018 Published by Elsevier Inc. Received 19 May 2018, Revised 29 July 2018, Accepted 31 July 2018, Available online 3 August 2018.
Subject Keywords:MAPO synthesis; Ionic liquids; Imidazolium SDA; MASNMR
Record Number:CaltechAUTHORS:20180803-101939156
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20180803-101939156
Official Citation:Annabelle I. Benin, Son-Jong Hwang, Stacey I. Zones, Dan Xie, Kaustav Chaudhuri, Howard Lacheen, Structural and compositional studies of crystalline MAPO molecular sieves formed in ionothermal synthesis using imidazolium bromides, Microporous and Mesoporous Materials, Volume 274, 2019, Pages 257-265, ISSN 1387-1811, https://doi.org/10.1016/j.micromeso.2018.07.052. (http://www.sciencedirect.com/science/article/pii/S138718111830427X)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:88565
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:03 Aug 2018 17:30
Last Modified:17 Aug 2018 21:41

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