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负载型钯基催化剂的制备及对Cr(Ⅵ)的液相催化加氢还原研究
Preparation of Supported Palladium-Based Catalysts and Liquid-Phase Catalytic Hydroreduction of Cr(VI)
【摘要】 选择SiO2为载体,合成了负载型钯基催化剂Pd/SiO2和Pd/SiO2-NH2,并将催化剂应用于对Cr(Ⅵ)的催化加氢还原实验。用等离子体发射光谱、透射电子显微镜、X-射线光电子能谱,以及傅里叶变换红外光谱技术对所制备的催化剂进行了详细的表征。结果显示:制备的催化剂均具有很高的稳定性,对比Pd/SiO2,Pd/SiO2-NH2可更有效地分散贵金属钯颗粒,提高活性位点的数量,催化性能更好;Cr(Ⅵ)的催化加氢还原反应符合Langmuir-Hinshelwood模型,在酸性环境中,Cr(Ⅵ)的还原反应会更加显著。研究结果为钯基催化剂有效去除Cr(Ⅵ)提供理论参考。
【Abstract】 In this paper,SiO2 was selected as the carrier to synthesize the supported Pd/SiO2 and Pd/SiO2-NH2,and the catalyst was applied to the catalytic hydroreduction experiment of Cr(Ⅵ).The catalysts were characterized in detail using plasma emission spectroscopy,transmission electron microscopy,X-ray photoelectron spec‐troscopy,and Fourier infrared spectroscopy.The results showed that the prepared catalysts had high stability,and compared with Pd/SiO2,Pd/SiO2-NH2 could more effectively disperse precious metal Pd particles,increase the number of active sites,and have better catalytic performance.The catalytic hydrogenation reduction reaction of Cr(Ⅵ)conforms to the Langmuir-Hinshelwood model,and the reduction reaction of Cr(Ⅵ)will be more significant in an acidic environment.After research,Pd-based catalysts can effectively remove Cr(Ⅵ),which provides an important theoretical basis.
【Key words】 Pd/SiO2-NH2; amination; Cr(Ⅵ); catalytic hydrogenation reduction;
- 【文献出处】 安徽师范大学学报(自然科学版) ,Journal of Anhui Normal University(Natural Science) , 编辑部邮箱 ,2023年03期
- 【分类号】X703;TQ426
- 【下载频次】14