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Sulfur Resistance of Ba-Pt/γ-Al2O3 Pellets for Carbonyl Sulfide Hydrolysis (Rintangan Sulfur Pelet Ba-Pt/γ- Al2O3 untuk Hidrolisis Karbonil Sulfida)
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DOI：10.17576/jsm-2026-5504-04.png)
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Abstract
En 中文
The catalytic hydrolysis of carbonyl sulfide (COS) was studied using gamma-Al(2)O(3 )pellets promoted with platinum (Pt) and barium (Ba). A series of catalysts, including gamma-Al2O3, 0.1Pt/gamma-Al2O3, and Ba-promoted Pt/gamma-Al2O3 with varying Ba loadings (0.5-3.0 wt%) were evaluated in terms of catalytic activity and sulfur tolerance. Catalyst deactivation after 180 min was quantified and correlated with sulfur retention determined by CHNS analysis. Bare gamma-Al(2)O(3 )resulted in the most severe deactivation (25.56%), whereas the Pt modification markedly improved the catalyst durability, reducing the degree of deactivation to 7.78%. Among the Ba-promoted catalysts, 0.5Ba-0.1Pt/gamma-Al2O3 exhibited the best performance, showing the lowest deactivation (7.73%) and the lowest sulfur retention (0.0427 wt%). In contrast, higher Ba loadings increased sulfur accumulation (up to 0.1259 wt%) and resulted in moderately higher deactivation (9.14-10.04%). TGA/DTG analysis of fresh and spent catalysts further supported the sulfur retention mechanism. This suggests that Pt improves sulfur tolerance by facilitating a more uniform distribution of sulfur species, whereas Ba enhances resistance by stabilizing and trapping sulfur species on the catalyst surface. These findings demonstrate that an appropriate balance of Pt and Ba loading is essential for improving catalyst durability, with 0.5Ba-0.1Pt/gamma-Al2O3 identified as the optimal composition for COS hydrolysis.
Keywords:
Barium promotion
catalyst deactivation
COS hydrolysis
platinum catalyst
sulfur poisoning
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