A study on the catalytic performance of the ZrO2@γ-Al2O3 hollow sphere catalyst for COS hydrolysis

• Published in: New journal of chemistry Vol. 47; no. 15; pp. 7070 - 7083
• Main Authors: Zhang, Lei, Wang Hengliang, Yang, Jia, Wang, Qi
• Format: Journal Article
• Language: English
• Published: Cambridge Royal Society of Chemistry 22.03.2023
• Subjects: Alkalinity; Aluminum oxide; Blast furnace gas; Carbon; Catalysts; Catalytic activity; Catalytic converters; Efficiency; Energy consumption; Hydrolysis; Pore size; Transitional aluminas; Zirconium dioxide
• ISSN: 1144-0546; 1369-9261
• DOI: 10.1039/d2nj04970h

In order to achieve the catalytic removal of COS gas from blast furnace gas by hydrolysis, it is necessary to obtain a hydrolysis catalyst with excellent performance. A hollow sphere hydrolysis catalyst with low catalytic energy consumption, long catalytic life and high conversion COS efficiency was prepared by using carbon spheres as a template and urea as a precipitant to increase the alkalinity of the impregnating solution to overcome the shortcomings of limited adsorption of a carbon sphere template. The structural characteristics of the prepared Al2O3 hollow sphere hydrolysis catalyst were first analyzed; then different proportions of zirconium nitrate were loaded onto the surface of the Al2O3 hollow spheres to investigate the effect of the formed ZrO2@γ-Al2O3 hollow sphere hydrolysis catalyst on the catalytic performance of COS hydrolysis. The results showed that the average pore size, total pore volume and specific surface area of the ZrO2@γ-Al2O3 hollow sphere hydrolysis catalyst roasted at 500 °C reached the maximum, with 12.921 nm, 0.177 cm3 g−1 and 52.969 m2 g−1, respectively. The hydrolytic catalytic efficiency of COS was highest when the roasting temperature was 500 °C. After 70 min of reaction, the hydrolytic conversion efficiency of COS remained at about 82% with a conversion of 158 mg m−3. The key problems of low catalytic activity and short catalytic life of hydrolysis catalysts can be effectively solved when using hydrolysis catalysis for the removal of COS.