梯度孔分布氧化铝载体的制备工艺研究

RESEARCH ON PREPARATION OF ALUMINA SUPPORT WITH HIERARCHICAL PORE DISTRIBUTION

为优化氧化铝孔径分布,实验采用不同模板剂,通过扩孔的方法制备了具有不同梯度孔分布的氧化铝载体。考察了模板剂类型、模板剂用量、水粉质量比和煅烧温度等工艺条件对氧化铝载体孔径分布的影响,并采用氮气物理吸附法和压汞法分析了载体孔结构。实验结果表明,模板剂组合对孔径分布的影响最显著。实验通过引入3种不同尺寸的炭黑,制备出了具有合理孔径分布的氧化铝载体,优化了其孔道结构,使得在提高负载催化剂的性能方面具有巨大的潜力。

Aluminium oxide is one of the most common catalyst supports,which can improve the performance of the catalyst enormously relying on its reasonable pore structure and suitable pore size distribution.In order to optimize the pore size distribution,different template agents were used in experiments,and aluminium oxide supports with different hierarchical pore distribution were prepared by reaming.The effects of combination modes of template agent,the amount of template agent,water/powder quality ratio and calcination temperature on the pore size distribution of aluminium oxide support were investigated,and aluminium oxide supports were characterized by nitrogen adsorption/desorption isotherms and high pressure mercury porosimetry.The experimental results show that the effect of combination modes of template agent on pore size distribution is the most obvious.Aluminium oxide support with reasonable pore size distribution was prepared by adding three different sizes of carbon black to optimize pore structure,which potentially can be applied for improving the performance of catalysts.