含氟体系优化合成Al-Beta分子筛膜

摘要

采用两步法在α-Al₂O₃载体上合成了致密连续的beta分子筛膜。首先，晶种层在无氟碱性体系中生长并交联形成致密的beta膜；然后，在含氟的近中性体系中再次生长形成具有（h0l）取向的分子筛膜，膜厚度约为3 μm。在450℃高温脱除模板剂以后，将膜进行单组分渗透蒸发实验。实验结果表明采用两步法合成的beta分子筛膜几乎无缺陷。

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	陈涛
	刘秀凤
	张宝泉

关键词： beta分子筛膜；渗透分离；两步法

Abstract：

An improved two-step method was introduced to prepare zeolite beta membranes, by which the seeding layer was firstly spin-coated on α-Al₂O₃ support and then it was crystallization in synthesis gel without fluoride and flowed with fluoride at 140℃ for 7 days successively. The beta zeolite membrane with thickness of about 3 μm is smooth and continuous, prefering to (h0l) orientation, covering the support completely and grasping the support firmly. After removing the organic template under 450℃, the quality of the membranes was evaluated by means of pervaporation tests. The experiments suggested that the membranes almost had no defects.

Keywords： beta zeolite membrane； pervaporation； two-step method

Received 2014-04-29;

Fund:

国家自然科学基金重点项目（21136008）。

Corresponding Authors: 刘秀凤,E-mail:xfliu@tju.edu.cn。 Email: xfliu@tju.edu.cn

About author: 陈涛(1987-),男,硕士,主要从事先进功能材料与过程强化方向研究。

引用本文:

陈涛, 刘秀凤, 张宝泉.含氟体系优化合成Al-Beta分子筛膜[J]. 化学工业与工程, 2016,33(4): 38-41,48

Chen Tao, Liu Xiufeng, Zhang Baoquan.Synthesis of Al-Beta Zeolite Membranes with an Improved Method in Fluoride Media[J]. Chemcial Industry and Engineering, 2016,33(4): 38-41,48

[1] Newsam J M, Treacy M M J, Koetsier W T, et al. Structural characterization of zeolite beta[J]. Proceedings of the Royal Society of London, A. Mathematical and Physical Sciences, 1988, 420(1 859): 375-405
[2] Corma A, Nemeth L T, Renz M, et al. Sn-Zeolite beta as a heterogeneous chemoselective catalyst for Baeyer-Villiger oxidations[J]. Nature, 2001, 412(6 845): 423-425
[3] Maloncy M L, Van Den Berg A W C, Gora L, et al. Preparation of zeolite beta membranes and their pervaporation performance in separating di-from mono-branched alkanes[J]. Microporous and Mesoporous Materials, 2005, 85(1): 96-103
[4] Mitra A, Cao T, Wang H, et al. Synthesis and evaluation of pure-silica-zeolite BEA as low dielectric constant material for microprocessors[J]. Industrial & Engineering Chemistry Research, 2004, 43(12): 2 946-2 949
[5] Tosheva L, Hölzl M, Metzger T H, et al. Zeolite beta films synthesized from basic and near-neutral precursor solutions and gels[J]. Materials Science and Engineering: C, 2005, 25(5): 570-576
[6] Larlus O, Valtchev V P. Control of the morphology of all-silica BEA-type zeolite synthesized in basic media[J]. Chemistry of Materials, 2005, 17(4): 881-886
[7] Lu B, Jon H, Kanai T, et al. Synthesis and characterization of large beta zeolite crystals using ammonium fluoride[J]. Journal of Materials Science, 2006, 41(6): 1 861-1 864
[8] Pham T C T, Kim H S, Yoon K B. Growth of uniformly oriented silica MFI and BEA zeolite films on substrates [J]. Science, 2011, 334(6 062): 1 533-1 538
[9] Jansen J C, Kashchiev D, Erdem-Senatalar A. Preparation of coatings of molecular sieve crystals for catalysis and separation[J]. Studies in Surface Science and Catalysis, 1994, 85: 215-250
[10] Jakob A, Valtchev V, Soulard M, et al. Syntheses of zeolite beta films in fluoride media and investigation of their sorption properties [J]. Langmuir, 2009, 25(6): 3 549-3 555
[11] Chen Y, Zhu G, Peng Y, et al. Synthesis and characterization of (h0l) oriented high-silica zeolite beta membrane[J]. Microporous and Mesoporous Materials, 2009, 124(1): 8-14
[12] Hong S B, Camblor M A, Davis M E. Host-Guest interactions in pure-silica and aluminosilicate sodalites containing ethylene glycol as a guest molecule [J]. Journal of the American Chemical Society, 1997, 119(4): 761-770
[13] Yang W, Zhang B, Liu X. Synthesis and characterization of SAPO-5 membranes on porous α-Al₂O₃ substrates [J]. Microporous and Mesoporous Materials, 2009, 117(1): 391-394