Microporous and Mesoporous Materials ( IF 4.8 ) Pub Date : 2019-02-13 , DOI: 10.1016/j.micromeso.2019.02.021 Lingxue Tang , Kok-Giap Haw , Yiying Zhang , Qianrong Fang , Shilun Qiu , Valentin Valtchev
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Highly crystalline and pure SSZ-13 zeolite is obtained by interzeolite conversion of zeolite Beta and zeolite L. Zeolite Beta is used without preliminary treatment, while zeolite L is subjected to dealumination in order to reach the Si/Al ratio appropriate for the synthesis of SSZ-13. The formation of SSZ-13 from conventional chemicals is also studied. The crystallization from zeolite precursors is much faster and provides pure and highly crystalline SSZ-13. The improved crystal growth kinetics is attributed to the directing effect of the dissolved Si-O-Al fragments from zeolite Beta and zeolite L frameworks. CHA-type zeolites obtained from dealuminated zeolite L crystallized faster, showed higher crystallinity and more defined crystals morphology in respect to those obtained from zeolite Beta. The dealuminated zeolite L was found to be an outstanding starting material for the crystallization of SSZ-13.
中文翻译:
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β-沸石和L-沸石的沸石间转化快速有效地合成SSZ-13
通过沸石β和沸石L的沸石间转化获得高结晶度和纯净的SSZ-13沸石。未经预处理就使用沸石β,同时对沸石L脱铝以达到适合合成SSZ的Si / Al比-13。还研究了由常规化学物质形成SSZ-13的过程。从沸石前体的结晶要快得多,并提供纯净且高度结晶的SSZ-13。改善的晶体生长动力学归因于来自β-沸石骨架和L-沸石骨架的溶解的Si-O-Al片段的导向作用。从脱铝的沸石L获得的CHA型沸石结晶更快,相对于从β-沸石获得的CHA型沸石显示出更高的结晶度和更明确的晶体形态。