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本文通过x-射线衍射、差热分析、热失重、比表面积、氦、汞密度、活性及机械强度等测定,研究了在200-300℃范围内干燥和焙烧,对铁铬系中温变换催化剂性能的效应。结果表明、随着干燥(或焙烧)温度的提高,催化剂的比孔容、孔隙率、平均粒子大小,均明显增大,比表面积降低。所得催化剂的耐热后强度,以200℃干燥,300℃焙烧的样品最高。由得到的10gS对T/T_m的线性关系,表明在200-300℃焙烧范围内,催化剂的焙烧烧结机理,为粒子的表面扩散。
In this paper, the properties of Fe-Cr-based mid-temperature shift catalysts were studied by means of x-ray diffraction, differential thermal analysis, thermogravimetry, specific surface area, helium, mercury density, activity and mechanical strength. Effect. The results show that with the increase of drying temperature, the specific pore volume, porosity and average particle size of the catalyst increase obviously, and the specific surface area decreases. The resulting catalyst had a heat-resistant strength of 200 ° C and a maximum of 300 ° C. From the obtained 10gS to T / Tm linear relationship, shows that in the range of 200-300 ℃ calcination sintering catalyst sintering mechanism for the particle surface diffusion.