The crystal quality and structure of AM-6

Rumeysa Tekin, Juliusz Warzywoda, Albert Sacco

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Microporous vanadosilicate AM-6, is ostructural with titanosilicate ETS-10, is a novel promising material in the traditional zeolite applications such as catalysis, photocatalysis, gas separation, sorption and the monatomic -O-V-O-V-O chains have shown potential for use in quantum wire application. High purity vanadosilicate AM-6 products with different crystal quality (disorder, or average length of the V-O-V chains in the AM-6 framework) and sizes in the range of ∼50 nm to ∼6 μm were hydrothermally synthesized at 448-503 K using tetramethylammonium (TMA+) io n s. The combined SEM, EDX, XRD, Raman, TGA, XPS, and nitrogen adsorption isotherm data showed that by treating these as-synthesized materials in gaseous ammonia at 673 Kit is possible to completely remove TMA+ ions from the AM-6 pores without adversely affecting product crystallinity and the micropore structure of AM-6, and with only minimal degradation of crystal quality of the resulting products. However, the success in a complete removal of TMA+ ions without affecting other crystalochemical characteristics of the product depended on its init ial crystal qualit y. TMA+ ions could not be completely remo ved from the lowest crystal quality product (FWHM=20.3 cm-1) without completely decomposing the V-O-V chains. The intermediate crystal quality product (FWHM=15.0 cm-1) could be successfully ammonia-treated only at 673 K to remove TMA+ ions, but higher temperatures resulted in a complete decomposition of the V-O-V chains. The highest crystal quality product (FWHM=12.7 cm-1) retained the integrity of V-O-V chains as well as the long range order and the micropore structure when ammonia-treated up to 748 K.

Original languageEnglish
Title of host publicationMeet the Faculty Candidate Poster Session 2017 � Sponsored by the Education Division - Topical Conference at the 2017 AIChE Annual Meeting
PublisherAIChE
Pages149-151
Number of pages3
ISBN (Electronic)9781510857773
StatePublished - 2017
EventMeet the Faculty Candidate Poster Session 2017 � Sponsored by the Education Division - Topical Conference at the 2017 AIChE Annual Meeting - Minneapolis, United States
Duration: Oct 29 2017Nov 3 2017

Publication series

NameMeet the Faculty Candidate Poster Session 2017 � Sponsored by the Education Division - Topical Conference at the 2017 AIChE Annual Meeting
Volume2017-October

Conference

ConferenceMeet the Faculty Candidate Poster Session 2017 � Sponsored by the Education Division - Topical Conference at the 2017 AIChE Annual Meeting
CountryUnited States
CityMinneapolis
Period10/29/1711/3/17

Keywords

  • AM-6
  • Crystal quality
  • Gaseous ammonia treatment
  • Hydrothermal synthesis
  • Vanadosilicates

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  • Cite this

    Tekin, R., Warzywoda, J., & Sacco, A. (2017). The crystal quality and structure of AM-6. In Meet the Faculty Candidate Poster Session 2017 � Sponsored by the Education Division - Topical Conference at the 2017 AIChE Annual Meeting (pp. 149-151). (Meet the Faculty Candidate Poster Session 2017 � Sponsored by the Education Division - Topical Conference at the 2017 AIChE Annual Meeting; Vol. 2017-October). AIChE.