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CHA-type zeolites w...
CHA-type zeolites with high boron content : Synthesis, structure and selective adsorption properties
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Liang, Jie (författare)
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- Su, Jie (författare)
- Stockholms universitet,Institutionen för material- och miljökemi (MMK)
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Wang, Yingxia (författare)
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Lin, Zhongjun (författare)
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Mu, Weijun (författare)
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- Zheng, Haoquan (författare)
- Stockholms universitet,Institutionen för material- och miljökemi (MMK)
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Zou, Ruqiang (författare)
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Liao, Fuhui (författare)
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Lin, Jianhua (författare)
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(creator_code:org_t)
- Elsevier BV, 2014
- 2014
- Engelska.
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Ingår i: Microporous and Mesoporous Materials. - : Elsevier BV. - 1387-1811 .- 1873-3093. ; 194, s. 97-105
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
Nyckelord
- Chabazite
- Borosilicate
- Adsorption
- Structure directing agent
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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