Effect of Structure-Directing Agents on FAU-CHA Interzeolite Conversion and Preparation of High Pervaporation Performance CHA Zeolite Membranes for the Dehydration of Acetic Acid Solution
Effect of Structure-Directing Agents on FAU-CHA Interzeolite Conversion and Preparation of High Pervaporation Performance CHA Zeolite Membranes for the Dehydration of Acetic Acid Solution
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DOI：
10.1246/bcsj.20130189
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发表时间：
2013-11-15
影响因子：
4
通讯作者：
Sano, Tsuneji
中科院分区：
文献类型：
--
作者：
Yamanaka, Naoki;Itakura, Masaya;Sano, Tsuneji
研究了在苄基三甲基氢氧化铵（BTMAOH）和1-金刚烷基三甲基氢氧化铵（AdaTMOH）作为有机结构导向剂（OSDA）存在下FAU-CHA沸石间的转化。AdaTMOH能够很好地将起始的FAU型沸石分解/溶解成局部有序的铝硅酸盐物质（纳米部分）并将它们转化成CHA型沸石。相反，虽然BTMAOH在分解和转化方面没有显示出与AdaTMOH相比如此高的性能，但是所获得的CHA型沸石显示出更高的酸稳定性。接下来，研究了高耐酸CHA型沸石在膜中的应用。通过FAU-CHA沸石间转化在多孔α-氧化铝管外表面制备的CHA沸石膜在乙酸水溶液脱水中表现出优异的渗透汽化性能。一个高渗透通量约。8 kg m（-2）h（-1），分离系数高，约为0.001。在长期（1700 h）试验期间保持2500。
FAU-CHA interzeolite conversions were investigated in the presence of benzyltrimethylammonium hydroxide (BTMAOH) and 1-adamantyltrimethylammonium hydroxide (AdaTMOH) as organic structure-directing agents (OSDAs). AdaTMOH was well able to both decompose/dissolve the starting FAU-type zeolites into locally ordered aluminosilicate species (nanoparts) and transform them into CHA-type zeolites. In contrast, although BTMAOH did not show such high performance in the decomposition and transformation as compared to AdaTMOH, the obtained CHA-type zeolites exhibited higher acid stability. Next, the application of the highly acid-resistant CHA-type zeolites to membranes was investigated. The CHA zeolite membrane prepared on the outer surface of a porous a-alumina tube by FAU-CHA interzeolite conversion demonstrated excellent pervaporation performance in the dehydration of acetic acid aqueous solution. A high permeate flux of ca. 8 kg m(-2) h(-1) with a high separation factor of ca. 2500 was maintained during long-term (1700h) testing.