High H2O-resistance CaO-MnOx/MSU-H sorbents for hot coal gas desulfurization

• Published in: Journal of hazardous materials 2017-02, Vol.324, p.281-290
• Main Authors: Xia, Hong, Liu, Bingsi
• Format: Article
• Language: English
• Subjects: Ca modified Mn-based sorbents; Desulfurization; H2O-resistance; Oxidation/reduction regeneration; Stable MSU-H
• ISSN: 0304-3894; 1873-3336
• DOI: 10.1016/j.jhazmat.2016.10.058

[Display omitted] •CaO-MnOx/MSU-H exhibited high capacity and endurable regeneration ability.•Utilization of MSU-H improved dispersion of particles and diffusion rate of gas.•Ca species played dual roles for high dispersion of Mn2O3 and effective sorption of H2S/H2O.•90Mn10Ca/MSU-H sorbent presented outstanding H2O-resistance ability. A series of xMnyCa/MSU-H sorbents with various Mn/Ca molar ratio were first designed and synthesized with a sol-gel method. The desulfurization performance of the new sorbent was investigated at 600–800°C in hot coal gas. 90Mn10Ca/MSU-H exhibited better desulfurization performance at 750°C with a breakthrough sulfur capacity (BSC) of 18.69g S/100g sorbent compared to other supported Mn-based sorbents (13.2g S/100g sorbent) in similar desulfurization condition, and strong durability in multiple sulfidation-regeneration cycles using oxidation/reduction regeneration method which resolved the scientific issue of that CaSO4 is hardly decomposed to CaO. The introduction of Ca species effectively promoted the dispersion of active constituents, which improved the desulfurization activity. More importantly, 90Mn10Ca/MSU-H showed excellent H2O-resistance ability due to the fact that CaO enhanced the sorption of H2O. Moreover, the utilization of MSU-H with large pore size and excellent thermal stability effectively assured fast mass-transfer and confined the migration of active particles, which led to long lifetime stability of sorbents.