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Synthesis and characterization of nano-sized copper-silicate with mel structure

Studies in Surface Science and Catalysis(2004)

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Abstract
Nano-sized copper silicalite with MEL structure has been hydrothermally synthesized for the first time under static conditions. The physicochemical property of this novel material was characterized by means of XRD, TEM, FT-IR, ESR, TG-DTA and NH3-TPD techniques. The results revealed that the as-syntliesized copper silicalite was highly thermally stable owing to its siliceous nature. This monophased crystalline material was quite uniform in size around 1 x 10(-8) m. Cupric ions were highly dispersed and mainly resided in distorted tetrahedral and square pyramidal environments before and after calcination. However, most of the incorporated copper ions left from the framework upon calcination and NH4Ac extraction, which resulted in a high density of lattice defect in the framework. Incorporation of cupric ions into the silicalite framework during crystallization also resulted in a weak acidity on this material.
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Key words
copper silicalite-2,heteroatom molecular sieve,hydrothermal synthesis,characterization MEL
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