Core–shell molecular sieves exhibit excellent performance in many catalytic processes due to their adjustable pore distribution and surface structure. This work developed a silicon coating method for molecular sieves and explored the synthesis method of Y/amorphous-silica composite materials. The effects of ultrasound treatment, silicon source addition amount, and template properties on the amorphous silica structure and properties were determined through comparative experiments. The optimal preparation conditions were obtained, achieving adjustable thickness of the molecular sieve shell. Subsequently, based on the optimal preparation conditions of Y/amorphous silica composite materials, a ZSM-5/silicalite-1 composite molecular sieve with core–shell structure was successfully synthesized, and the structural characteristics of the synthesized core–shell molecular sieve were comprehensively analyzed. The amorphous silica core–shell composite materials prepared in this work achieved directional control of shell thickness and pore structure, providing a promising approach for the preparation of core–shell structures.

中文翻译：

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硅涂层法合成核壳分层孔分子筛的制备及结构性能研究


由于其可调节的孔隙分布和表面结构，核壳分子筛在许多催化过程中表现出优异的性能。本工作开发了分子筛的硅涂层方法，并探索了 Y/非晶硅复合材料的合成方法。通过对比实验确定了超声处理、硅源添加量和模板性能对非晶态二氧化硅结构和性能的影响。获得了最佳的制备条件，实现了分子筛壳的厚度可调。随后，基于Y/非晶态二氧化硅复合材料的最佳制备条件，成功合成了具有核壳结构的ZSM-5/硅石-1复合分子筛，并综合分析了所合成的核壳分子筛的结构特性。本工作制备的非晶态二氧化硅核-壳复合材料实现了壳厚度和孔隙结构的定向控制，为核-壳结构的制备提供了一种有前途的方法。