TY - JOUR
T1 - CHA-type zeolites with high boron content
T2 - Synthesis, structure and selective adsorption properties
AU - Liang, Jie
AU - Su, Jie
AU - Wang, Yingxia
AU - Lin, Zhongjun
AU - Mu, Weijun
AU - Zheng, Haoquan
AU - Zou, Ruqiang
AU - Liao, Fuhui
AU - Lin, Jianhua
PY - 2014/8
Y1 - 2014/8
N2 - 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. 11B MAS NMR shows that all the boron atoms are incorporated into the framework as tetrahedral BO 4 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 °C. These borosilicates, with the BET surfaces of 583-632 m2/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.
AB - 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. 11B MAS NMR shows that all the boron atoms are incorporated into the framework as tetrahedral BO 4 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 °C. These borosilicates, with the BET surfaces of 583-632 m2/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.
KW - Adsorption
KW - Borosilicate
KW - Chabazite
KW - Structure directing agent
UR - https://www.scopus.com/pages/publications/84899454687
U2 - 10.1016/j.micromeso.2014.04.002
DO - 10.1016/j.micromeso.2014.04.002
M3 - 文章
AN - SCOPUS:84899454687
SN - 1387-1811
VL - 194
SP - 97
EP - 105
JO - Microporous and Mesoporous Materials
JF - Microporous and Mesoporous Materials
ER -