Nkinahamira François, Sun Senlin, Zhu Rongshu
State Key Laboratory of Urban Water Resource and Environment, Shenzhen Key Laboratory of Organic Pollution Prevention and Control, School of Civil and Environmental Engineering, Harbin Institute of Technology Shenzhen, Shenzhen 518055, PR China.
State Key Laboratory of Urban Water Resource and Environment, Shenzhen Key Laboratory of Organic Pollution Prevention and Control, School of Civil and Environmental Engineering, Harbin Institute of Technology Shenzhen, Shenzhen 518055, PR China.
J Hazard Mater. 2025 Apr 5;487:137204. doi: 10.1016/j.jhazmat.2025.137204. Epub 2025 Jan 13.
A series of core-shell In/H-Beta@Ce catalysts were synthesized by encapsulating In/H-Beta within an amorphous CeO shell and then evaluated for the selective catalytic reduction of NO by CH (CH-SCR) under challenging conditions with SO and HO. IB@Ce-2 achieved 57.7 % NO conversion at 625°C, representing a 23.0 % improvement over In/H-Beta (35.0 %) under similar no-optimized conditions. Under optimized conditions, it further achieved 97.5 % NO conversion at 600°C. Durability tests for IB@Ce-2 under optimized conditions showed NO conversion decreased from 97.5 % to 52.7 % over three cycles, while long-term operation maintained over 70 % conversion for 60 minutes. The amorphous CeO shell enhanced SO and HO tolerance by shielding InO active sites, facilitating redox cycling, and limiting sulfate formation. These findings highlight IB@Ce-2 as a durable and efficient candidate for NO abatement in natural gas vehicles and other real-world applications.
通过将In/H-Beta封装在非晶态CeO壳层中来合成一系列核壳结构的In/H-Beta@Ce催化剂，然后在存在SO₂和H₂O的具有挑战性的条件下对其进行CH₄选择性催化还原NO（CH₄-SCR）的评估。IB@Ce-2在625°C时实现了57.7%的NO转化率，在类似的未优化条件下比In/H-Beta（35.0%）提高了23.0%。在优化条件下，它在600°C时进一步实现了97.5%的NO转化率。在优化条件下对IB@Ce-2进行的耐久性测试表明，在三个循环中，NO转化率从97.5%降至52.7%，而长期运行在60分钟内保持转化率超过70%。非晶态CeO壳层通过屏蔽In₂O₃活性位点、促进氧化还原循环和限制硫酸盐形成来提高对SO₂和H₂O的耐受性。这些发现突出了IB@Ce-2作为天然气车辆和其他实际应用中NO减排的耐用且高效候选材料的地位。
