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以纳米多晶β 沸石为壳的核壳Y 型沸石复合物的制备及表征
作者:潘梦 王广帅 郑家军 鲍杰华 李彪 李瑞丰 
单位:太原理工大学能源化工与催化研究中心 太原 030024 
关键词:核壳结构 沸石复合物 纳米多晶β 沸石 附晶生长 
分类号:TQ 426
出版年,卷(期):页码:2015,43(5):685-691
DOI:10.14062/j.issn.0454-5648.2015.05.19
摘要:

 将经过四乙基溴化铵交换后的Y 型沸石加入到已预晶化23~117 h 的β 沸石反应混合物中,经二次水热晶化,将组成及合成条件差异巨大的Y 型沸石和β 沸石成功复合在一起,并得到了以Y 型沸石为核、以纳米多晶β 沸石为壳的核壳沸石复合物(Y@Nano-β)。研究了Y 型沸石的四乙基铵根离子(TEA+)改性、改性Y 沸石(TEA-Y)添加量、预晶化时间以及二次水热晶化时间等对Y@Nano-β 沸石复合物形成的影响,探讨了Y@Nano-β 核@壳沸石复合物的形成和生长机理。结果表明,制备条件对Y@Nano-β 沸石复合物的形成影响较大。在β 沸石合成体系中,NaY 远不及TEA-Y 稳定,为得到核壳沸石复合物Y@Nano-β,需要将NaY 沸石交换成TEA-Y。控制每18 mL β 沸石合成凝胶中加入1 g TEA-Y,β 沸石的预晶化时间为96 h,第二步晶化时间大于75 h 可以制备出以Y 型沸石为核,以晶粒尺寸分布在50~100 nm 之间的纳米多晶β沸石为壳的复合物。

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 A zeolite-zeolite composite composed of Y zeolite cores and a nano-β zeolite polycrystalline shells (i.e., Y@Nano-β) with

different zeolite structures and incompatible framework compositions was synthesized. The factors affecting the formation of the
zeolite-zeolite composite of Y@Nano-β, such as NaY with and without the modification by tetraethylammonium cation (TEA+), the
amount of TEA-Y, the pre-treated time of precursor mixture for yielding β zeolite and the second-crystallization time were
investigated. The formation mechanism of the as-synthesized zeolite-zeolite composite of Y@Nano-β was discussed. The results
show that the preparation conditions play an important role in the formation of the zeolite-zeolite composite of Y@Nano-β. In order to
obtain Y@Nano-β, it is necessary to modify NaY by TEA+ because TEA-Y is more stable than NaY in basic medium of β zeolite. The
zeolite–zeolite composite composed of Y zeolite cores and polycrystalline β zeolite shells can be obtained at the amount of TEA-Y of
1 g (per 18 mL β gel), the pre-treated time of 96 h and the second-crystallization time of more than 75 h.
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基金项目:
国家自然科学基金委-中石化联合基金(重点支持项目:U1463209);国家自然科学基金(21371129;21376157;51272169)资助。
作者简介:
潘 梦(1989—),男,博士研究生。
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