CHA-type zeolites with high boron content: Synthesis, structure and selective adsorption properties
2014 (English)In: Microporous and Mesoporous Materials, ISSN 1387-1811, Vol. 194, 97-105 p.Article in journal (Refereed) Published
Borosilicate zeolites with CHA-type framework are synthesized hydrothermally by using N,N,N-trimethylcyclohexylammonium hydroxide as structure directing agent. The use of this cation induces an increase of boron content in the CHA-type zeolites, and the Si/B ratios of the as-synthesized samples is in the range of 11.8-6.9. Rietveld refinements of the calcinated samples reveal a contraction of unit cells with the increase of boron content, and the 8-ring opening window of cha cavity becomes narrower. B-11 MAS NMR shows that all the boron atoms are incorporated into the framework as tetrahedral BO4 units in the as-synthesized samples. The thermal stability of these CHA-type borosilicates decreases with the increase of boron content, and the framework can retain up to 800 degrees C. These borosilicates, with the BET surfaces of 583-632 m(2)/g, show a high adsorption capacity for H-2 at 77 K, 900 mmHg and a preferential adsorption for CO2 at 273 K. This selective adsorption property enables CHA-type borosilicates to be potential materials as CO2 adsorbent.
Place, publisher, year, edition, pages
2014. Vol. 194, 97-105 p.
Chabazite, Borosilicate, Adsorption, Structure directing agent
IdentifiersURN: urn:nbn:se:su:diva-106313DOI: 10.1016/j.micromeso.2014.04.002ISI: 000337867300015OAI: oai:DiVA.org:su-106313DiVA: diva2:736167