Synthesis and Characterization of CIT-13, a Germanosilicate Molecular Sieve with Extra-Large Pore Openings
Number of Authors: 6
2016 (English)In: Chemistry of Materials, ISSN 0897-4756, E-ISSN 1520-5002, Vol. 28, no 17, 6250-6259 p.Article in journal (Refereed) Published
The synthesis of the germanosilicate CIT-13, a molecular sieve that is the first to have a two-dimensional (2D) pore system possessing pores that are bounded by 14- and 10-rings, is accomplished using a family of monoquaternary, benzyl-imidazolium organic structure-directing agents (OSDAs) in aqueous media containing fluoride. CIT-13 is prepared using either hydrogen fluoride (HF) or ammonium fluoride (NH4F). The structure refinement suggests that most of the Ge atoms are located in the d4r(double-4-rings) units, and that there are framework disorders in the arrangement of those d4r units. Other characterizations of CIT-13 such as Si-29 MAS NMR spectra, Ar-adsorption isotherms, and so forth are presented and compared to those of IM-12 (UTL), a previously reported germanosilicate with 14- and 12-ring pores.
Place, publisher, year, edition, pages
2016. Vol. 28, no 17, 6250-6259 p.
Chemical Sciences Materials Engineering
IdentifiersURN: urn:nbn:se:su:diva-135191DOI: 10.1021/acs.chemmater.6b02468ISI: 000383318500029OAI: oai:DiVA.org:su-135191DiVA: diva2:1047300