Exceptionally Small Colloidal Zeolites Templated by Pd and Pt Amines
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- 作者：Johann Kecht ; Svetlana Mintova ; Thomas Bein
- 刊名：Langmuir
- 出版年：2008
- 出版时间：April 15, 2008
- 年：2008
- 卷：24
- 期：8
- 页码：4310 - 4315
- 全文大小：420K
- 年卷期：v.24,no.8(April 15, 2008)
- ISSN：1520-5827
文摘
Monomodal colloidal suspensions containing EDI-type zeolite nanocrystals with sizes below 20 nm were preparedvia a palladium and platinum amine templating approach. The role of the metal complexes in zeolite crystallizationis elucidated using spectroscopic and microscopic characterization techniques in a series of samples containing purePd, Pt, and Cu amine complexes as well as mixtures of two compounds. The crystallization process of colloidal zeolitesin precursor suspensions containing both [Pd(NH3)4]2+ and [Pt(NH3)4]2+ proceeds faster than in [Cu(NH3)4]2+ systems.The Pd and Pt complexes lead to a faster and enhanced nucleation rate in the precursor aluminosilicate suspensionsin comparison to the copper amine complex. The latter explains both the smaller particle size and the higher monodispersityin the samples templated by Pd and Pt as compared to pure Cu-containing samples. Precursor systems containing mixedmetal templates were used to control further the particle size and degree of metal loadings in the colloidal molecularsieves.