【摘要】 硅氢加成反应作为合成有机硅产品的最重要的反应类型之一,反应中催化剂的选择和制备一直是研究者关注的热点。合成了一种铂纳米颗粒(Pt NPs),将其固定在沸石咪唑骨架(Zeolitic Imidazolate FrameworksZIFs)中作为光催化剂的复合材料,在紫外光诱导下催化硅氢加成反应。同时还考察了光敏剂萘作为助催化剂对反应转化率的影响,结果表明,随着光敏剂浓度的增加,反应转化率和速率都明显提高;同时还考察了其他因素对反应的影响,如光强和含氢硅油添加量,发现光强的增大对反应转化率也有明显的提升作用,而当含氢硅油添加过量时并不能使反应转化率提高。本工作利用操作简便的方法成功地实现了铂催化剂的制备,为多相铂催化剂的制备提供一种新思路。更多还原

【Abstract】 As one of the most important reaction types for the synthesis of organosilicon products,the selection and preparation of the catalysts in the hydrosilylation has been a hot topic for researchers.In this paper,a composite material with platinum nanoparticles(Pt NPs) immobilized in zeolitic imidazolate frameworks(zeolitic imidazolate frameworks-ZIFs) as a photocatalyst was synthesized and used to induce the hydrosilylation under UV-visible irradiation.The effect of the photosensitizer naphthalene as a co-catalyst on the reaction conversion was also investigated,and the results showed that both the conversion and the rate of the reaction increased significantly with the increase in the concentration of the photosensitizer.Then the effect of other factors on the reaction were also investigated,such as the light intensity and the amount of antrimethylsilyl-terminated polymethylhydrosiloxane(PMHS) added.It found that an increase in the light intensity also had a significant enhancement of the reaction conversion,while the addition of PMHS in excess did not lead to an increase in the reaction conversion.In this work,the preparation of the platinum catalysts is successfully achieved by a simple method,which provides a new idea for the preparation of multiphase platinum catalysts.更多还原