催化剂用载体硅胶孔隙特性分析

Pore Structure Analysis of Silica Gel as Carrier Used for Catalyst

关键词:  气体吸附法  扫描电镜法  载体硅胶  孔隙结构  表面形貌  等温曲线  孔径分布

Key words:  gas adsorption  scanning electron microscope  silica gel as carrier  pore structure  surface morphology  adsorption-desorption isotherms  pore size distribution

摘要:

结合气体吸附法和扫描电镜法研究载体硅胶的孔隙结构和表面形貌,对4种催化剂用载体硅胶进行了分析。4种硅胶的吸附-脱附等温曲线及其迟滞回线的形态表明,它们的孔隙均含有大量两端开放均匀的圆柱状且孔径分布较窄的中孔;LSG-1硅胶和955硅胶的比表面最为接近,且4种硅胶的总孔容均大于1.550cm3/g,平均孔径均大于21.00nm;4种硅胶的孔径分布曲线均近似为正态分布且孔径分布相似;4种硅胶粒子的球形度均较好,表面呈现出明显的凹凸不平,粗糙且存在裂纹。

Abstract:

Analyzing the pore structure and surface morphology of silica gels as carrier by gas adsorption and scanning electron microscope,four kinds of silica gels as carriers used for catalyst were measured.The result shows that all four kinds of silica gels contain a large quantity of cylindrical mesopores which open uniformly at both ends and mesopores with narrow pore size distribution;the specific surface of silica gel LSG-1 is close with silica gel 955,the total pore volume of all four kinds of silica gels is more than 1.550 cm3/g and the average pore size is more than 21.00 nm;the pore size distribution of all are similar and approximate to Gaussian distribution;all silica gel particles have good sphericity,and exhibit uneven and rough surface with crack.