MFI-type boroaluminosilicate: A comparative study between the direct synthesis and the templating method

Journal Article · Wed Mar 15 00:00:00 EST 2006 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2005.12.013· OSTI ID:20784930

Wei, Zhou ^[1]; Shiyu, Zhang ^[1]; Xiangying, Hao ^[1]; Hao, Guo ^[1]; Cui, Zhang ^[1]; Yinqing, Zhang ^[1]; Shuangxi, Liu ^[1]

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1. Institute of New Catalytic Materials Science, College of Chemistry, Nankai University, Tianjin 300071 (China)

Boroaluminosilicate with MFI zeotype (henceforth B-ZSM-5) was synthesized both via the direct synthesis where ZSM-5 was employed as crystal seed and the templating method by using TPABr as the structure-directing agent (SDA). Characterization based on its structure, bonding, surface acidity, and morphology was performed by powder X-ray diffraction (XRD), {sup 11}B MAS NMR spectrometry, FT-IR spectrometry, pyridine-chemisorption IR spectrometry, and scanning electron microscopy (SEM). The composition of the prepared zeolites was determined by ICP-AES; the zeolite framework stability was investigated by steam treatment. The differences in the physicochemical properties of B-ZSM-5 prepared by the two methods were compared and discussed. In the direct synthesis, increasing initial boron-substitution ratio concomitantly brings about increasing difficulty to prepare pure B-ZSM-5 and, MFI-type borosilicate (free of aluminum) cannot be synthesized; the highest SiO{sub 2}/Al{sub 2}O{sub 3} ratio=70.64 is received. B-ZSM-5 prepared by the templating method shows remarkable hydrothermal stability than its counterpart prepared by the direct synthesis.

• OSTI ID: 20784930
• Journal Information: Journal of Solid State Chemistry, Vol. 179, Issue 3; Other Information: DOI: 10.1016/j.jssc.2005.12.013; PII: S0022-4596(05)00600-6; Copyright (c) 2005 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ALUMINIUM OXIDES
AUGER ELECTRON SPECTROSCOPY
BORON SILICATES
CHEMICAL COMPOSITION
CHEMISORPTION
FOURIER TRANSFORMATION
INFRARED SPECTRA
NUCLEAR MAGNETIC RESONANCE
SCANNING ELECTRON MICROSCOPY
SILICON OXIDES
STABILITY
SYNTHESIS
X-RAY DIFFRACTION
ZEOLITES