Some observations on the synthesis of fully-dispersible nanocrystalline zeolite ZSM-5

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Title:	Some observations on the synthesis of fully-dispersible nanocrystalline zeolite ZSM-5
Authors:	蔣孝澈;Selvin, Rosilda;Chiang, Anthony S. T.
Contributors:	工學院化學工程與材料工程學系
Keywords:	Agglomeration;Aging;Aluminum;Heating;Nanocrystals;Nanoparticles - chemistry;Nanostructure;Nanotechnology;Particle Size;Synthesis;Zeolites;Zeolites - chemistry
Date:	2014-09-01
Issue Date:	2026-04-21 14:27:45 (UTC+8)
Publisher:	American Scientific Publishers;26650 The Old Road, Suite 208, Valencia, California 91381-0751, USA: American Scientific Publishers
Abstract:	摘要： A facile method for the rapid synthesis of fully-dispersible ZSM-5 (Si/Al = 100) of about 30 nm size in high yield (about 91%) is described. The method comprises three steps, viz., concentration of an initial clear solution, low-temperature (80 °C) ageing of concentrated sol, and high-temperature (175 °C) hydrothermal treatment or microwave heating (175 °C) of aged concentrated sol. A simple vacuum-concentration method was used for the extraction of pure NPs of ZSM-5 in solution. XRD, FT-IR, TGA and ASAP characterizations showed that the NPs were partially crystalline. The concentration step accelerated the aggregation of primary units, which helps in the production of a large number of nucleation centers protected by TPA+ ions against aggregation. During low-temperature ageing, the number of critical sized nuclei increases, growing into zeolite. The high-temperature heating results in the complete growth of unreacted silica, giving high yields. A key factor for generating small non-aggregated zeolite crystals is the amount of water in the synthesis sol. The three-step method presented here produces a target material of small and uniform sized, non-aggregated ZSM-5 of about 30 nm in a short reaction time. The results are significant, as the synthesis method adopted here produces much uniform, non-aggregated nanocrystalline ZSM-5 in a shorter time with high yield. 其他題名： J Nanosci Nanotechnol 出版者： 26650 The Old Road, Suite 208, Valencia, California 91381-0751, USA: American Scientific Publishers 出版日期： 2014-09-01 出處： Journal of nanoscience and nanotechnology, 2014-09, Vol.14 (9), p.7351-7359 識別號： ISSN: 1533-4880 識別號： EISSN: 1533-4899 識別號： DOI: 10.1166/jnn.2014.9239 識別號： PMID: 25924414
Appears in Collections:	[Department of Chemical and Materials Engineering] journal & Dissertation

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