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Sains Malaysiana 55(4)(2026): 634-644
http://doi.org/10.17576/jsm-2026-5504-04
Sulfur Resistance
of Ba-Pt/γ-Al2O3 Pellets for Carbonyl Sulfide
Hydrolysis
(Rintangan Sulfur Pelet Ba-Pt/γ- Al2O3 untuk Hidrolisis Karbonil Sulfida)
KANNAPORN NIMTHUPHARIYHA1,2, PUNYAPHAT JINJO3,
SARTTRAWUT TULAPHOL4, NURAK GRISDANURAK3,* & PUMMARIN KHAMDAHSAG5
1International
Program in Hazardous Substance and Environmental Management, Graduate School,
Chulalongkorn University, Bangkok 10330, Thailand
2Center
of Excellence on Hazardous Substance Material (HSM), Chulalongkorn University,
Bangkok 10330, Thailand
3Center
of Excellence in Environmental Catalysis and Adsorption, Faculty of
Engineering, Thammasat University, Pathum Thani 12121, Thailand
4Sustainable
Polymer & Innovative Composite Materials Research Group, Department of
Chemistry, Faculty of Science, King Mongkut’s University of Technology Thonburi
Bangkok 10140, Thailand
5Sustainable
Environment Research Institute, Chulalongkorn University, Bangkok 10330,
Thailand
Received: 17
September 2025/Accepted: 31 March 2026
Abstract
The
catalytic hydrolysis of carbonyl sulfide (COS) was studied using γ-Al2O3 pellets promoted with platinum (Pt) and barium (Ba). A series of catalysts,
including γ-Al2O3, 0.1Pt/γ-Al2O3,
and Ba-promoted Pt/γ-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 γ-Al2O3resulted 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/γ-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/γ-Al2O3 identified as the optimal
composition for COS hydrolysis.
Keywords:
Barium promotion; catalyst deactivation; COS hydrolysis; platinum catalyst;
sulfur poisoning; γ-Al2O3 pellets
Abstrak
Hidrolisis pemangkin karbonil sulfida (COS) telah dikaji menggunakan pelet γ-Al2O3 yang dipromosikan dengan platinum (Pt)
dan barium (Ba). Satu siri pemangkin, termasuk γ-Al2O3,
0.1Pt/γ-Al2O3 dan Pt/γ-Al2O3 yang dipromosikan oleh Ba dengan pelbagai beban Ba (0.5-3.0 wt%) telah dinilai dari segi aktiviti pemangkin dan toleransi sulfur. Penyahaktifan pemangkin selepas 180 minit telah diukur dan dikaitkan dengan pengekalan sulfur yang ditentukan oleh analisis CHNS. γ-Al2O3 kosong menghasilkan penyahaktifan yang paling teruk (25.56%), manakala pengubahsuaian Pt telah meningkatkan ketahanan pemangkin dengan ketara, mengurangkan tahap penyahaktifan kepada 7.78%.
Antara mangkin yang digalakkan oleh Ba, 0.5Ba-0.1Pt/γ-Al2O3 mempamerkan prestasi terbaik, menunjukkan penyahaktifan terendah (7.73%) dan pengekalan sulfur terendah (0.0427 wt%). Sebaliknya, pemuatan Ba
yang lebih tinggi meningkatkan pengumpulan sulfur (sehingga 0.1259 wt%)
dan mengakibatkan penyahaktifan yang agak tinggi (9.14-10.04%). Analisis TGA/DTG bagi mangkin segar dan terpakai menyokong lagi mekanisme pengekalan sulfur. Ini menunjukkan bahawa Pt meningkatkan toleransi sulfur dengan memudahkan taburan spesies sulfur yang lebih seragam, manakala Ba meningkatkan rintangan dengan menstabilkan dan memerangkap spesies sulfur pada permukaan mangkin. Penemuan ini menunjukkan bahawa keseimbangan pemuatan Pt dan Ba yang sesuai adalah penting untuk meningkatkan ketahanan mangkin dengan 0.5Ba-0.1Pt/γ-Al2O3 dikenal pasti sebagai komposisi optimum untuk hidrolisis COS.
Kata kunci: Hidrolisis COS; keracunan sulfur; mangkin platinum; pelet γ-Al2O3; penyahaktifan mangkin; promosi Barium
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*Corresponding
author; email: gnurak@engr.tu.ac.th
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