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Ozone catalytic oxidation for ammonia removal from simulated air at room temperature
被引:6
作者:
Liu, Yang
[1
]
Li, Xiao-Song
[1
]
Liu, Jing-Lin
[1
]
Shi, Chuan
[1
]
Zhu, Xiaobing
[1
]
Zhu, Ai-Min
[1
]
Jang, Ben W. -L.
[2
]
机构:
[1] Dalian Univ Technol, Lab Plasma Phys Chem, Dalian 116024, Peoples R China
[2] Texas A&M Univ Commerce, Dept Chem, Commerce, TX 75429 USA
基金:
中国国家自然科学基金;
关键词:
SUPPORTED MANGANESE OXIDES;
FE-EXCHANGED ZEOLITES;
SELECTIVE OXIDATION;
BENZENE OXIDATION;
MNOX/GAMMA-ALUMINA;
TRANSITION-METAL;
CARBON-MONOXIDE;
NITROGEN;
TOLUENE;
NH3;
D O I:
10.1039/c4cy01269k
中图分类号:
O64 [物理化学(理论化学)、化学物理学];
学科分类号:
070304 ;
081704 ;
摘要:
Ozone catalytic oxidation (OZCO) for removing ammonia from simulated air over the AgMn/HZSM-5 (AgMn/HZ) catalyst with high ammonia conversion and high N-2 selectivity at room temperature is reported for the first time. HZ, Ag/HZ, Mn/HZ and AgMn/HZ catalysts were compared in the OZCO reactions of gaseous and adsorbed NH3. In OZCO of gaseous NH3, N-2 was the major product and N2O was the minor product. NH3 conversion dropped quickly with time-on-stream (TOS) over HZ and Ag/HZ catalysts while it remained almost constant at a high level over Mn/HZ and AgMn/HZ catalysts during the entire test. N-2 selectivity of the AgMn/HZ catalyst was higher than that of the Mn/HZ catalyst. When the initial concentration of NH3 was 521 ppmv and the ratio of initial concentration of O-3 to NH3 was 1.73, 99% NH3 conversion with 94% N-2 selectivity was obtained over the AgMn/HZ catalyst at room temperature and 150000 ml g(-1) h(-1) gas hourly space velocity (GHSV). Finally, the pathways for OZCO of NH3 were proposed for the four catalysts based on the comparative investigation of the gaseous products and surface species during OZCO of adsorbed and gaseous NH3.
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页码:2227 / 2237
页数:11
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