Core-shell In/H-Beta@Ce catalyst with enhanced sulfur and water tolerance for selective catalytic reduction of NOx by CH4

被引：2
作者：
Nkinahamira, Francois [1 ]
Sun, Senlin [1 ]
Zhu, Rongshu [1 ]
机构：
[1] Harbin Inst Technol Shenzhen, Sch Civil & Environm Engn, State Key Lab Urban Water Resource & Environm, Shenzhen Key Lab Organ Pollut Prevent & Control, Shenzhen 518055, Peoples R China
来源：
JOURNAL OF HAZARDOUS MATERIALS | 2025年 / 487卷
关键词：
Core-shell catalyst; Amorphous CeO2; NO x; CH4-SCR; SO2/steam tolerance; NITRIC-OXIDE; METHANE; CERIA; ACIDITY; SURFACE; OXYGEN; REASSIGNMENT; PERFORMANCE; EMISSIONS; HYDROGEN;
D O I：
10.1016/j.jhazmat.2025.137204
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
A series of core-shell In/H-Beta@Ce catalysts were synthesized by encapsulating In/H-Beta within an amorphous CeO2 shell and then evaluated for the selective catalytic reduction of NOx by CH4 (CH4-SCR) under challenging conditions with SO2 and H2O. IB@Ce-2 achieved 57.7 % NOx conversion at 625 degrees 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 % NOx conversion at 600 degrees C. Durability tests for IB@Ce-2 under optimized conditions showed NOx conversion decreased from 97.5 % to 52.7 % over three cycles, while long-term operation maintained over 70 % conversion for 60 minutes. The amorphous CeO2 shell enhanced SO2 and H2O 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 NOx abatement in natural gas vehicles and other real-world applications.
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页数：15
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