CALCINATION OF LARGE MFI-TYPE SINGLE-CRYSTALS .2. CRACK FORMATION AND THERMOMECHANICAL PROPERTIES IN VIEW OF THE PREPARATION OF ZEOLITE MEMBRANES

被引：92

作者：

GEUS, ER

VANBEKKUM, H

机构：

[1] Delft University of Technology, Department of Organic Chemistry and Catalysis, 2628 BL Delft

来源：

ZEOLITES | 1995年 / 15卷 / 04期

关键词：

SILICALITE (MFI); CALCINATION; MICROSCOPE FTIR SPECTROSCOPY; X-RAY POWDER DIFFRACTION; ZEOLITE MEMBRANES;

D O I：

10.1016/0144-2449(94)00034-P

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The calcination in air of large, tetrapropylammonium (TPA)-templated silicalite (MFl) crystals has been studied with special attention to the development of cracks. Crystal cracking on activation of TPA-templated MFl crystalline material arranged in a membrane configuration adversely affects the molecular sieve characteristics desired. Techniques used are visible light microscopy, microscope FTi.r. spectroscopy, and thermogravimetry. Differently prepared silicalite crystals have been found to exhibit deviating crystal cracking. Temperature-programmed X-ray powder diffraction has been performed to assess the thermal expansion/contraction behavior of both as-synthesized (TPA-containing) MFl on calcination and activated MFl material when subjected to thermal cycling. The observations from the calcination study assisted in determining a ''safe'' calcination procedure for supported, polycrystalline silicalite/MFl-type membranes, prepared via in situ growth.

引用

页码：333 / 341

页数：9

共 37 条

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