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题名: In situ FT-IR investigation on the selective catalytic reduction of NO with CH4 over Pd/sulfated alumina catalyst
作者: Zhang, Hongyan1, 2;  Li, Lin1;  Li, Ning1;  Wang, Aiqin1;  Wang, Xiaodong1;  Zhang, Tao1
关键词: Adsorption ;  NO-O-2 co-adsorption ;  In situ FT-IR ;  Nitrates ;  deNO(x) ;  CH4 ;  SCR ;  Pd
刊名: APPLIED CATALYSIS B-ENVIRONMENTAL
发表日期: 2011-11-02
DOI: 10.1016/j.apcatb.2011.08.040
卷: 110, 页:171-177
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Engineering, Environmental ;  Engineering, Chemical
研究领域[WOS]: Chemistry ;  Engineering
英文摘要: In situ Fourier Transform Infrared (FT-IR) spectroscopy was applied to study the mechanism of the selective catalytic reduction (SCR) of NO with methane over 0.1 wt% Pd/sulfated alumina (SA) catalyst. Here, CO adsorption, NO adsorption, NO-O-2 co-adsorption and interaction of the intermediates after NO-O-2 adsorption with methane or methane/oxygen were investigated. The FT-IR results show that the Pd supported on Al2O3 mainly exists as oxide, such as PdO cluster. While, the Pd supported on SA mainly exists as isolated Pd2+ ions. The addition of Pd can promote the formation of nitro/nitrito and nitrate species on Al2O3 or SA at room temperature. At the same time, Pd also promotes the nitrates decomposition at high temperatures. Support sulfation further decreases the total concentration of the nitrates adsorbed on the surface of catalysts and lowers their thermal stability. Moreover, support sulfation can also stabilize isolated Pd2+ ions, which could catalyze the reaction between nitrate species and methane. Upon co-adsorption of NO and O-2 on 0.1 wt% Pd/SA catalyst, the intermediate Pd2+-NO was produced. This intermediate could readily react with CH4 and O-2, but almost not react with CH4 over 350 degrees C. (C) 2011 Elsevier B.V. All rights reserved.
关键词[WOS]: PROMOTED TUNGSTATED ZIRCONIA ;  SULFATED ZIRCONIA ;  NITRIC-OXIDE ;  EXCESS O-2 ;  WATER-VAPOR ;  SPECTROSCOPIC CHARACTERIZATION ;  PALLADIUM CATALYSTS ;  SURFACE-REACTION ;  CARBON-MONOXIDE ;  NITROGEN-OXIDES
语种: 英语
WOS记录号: WOS:000297093500021
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/142609
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China

Recommended Citation:
Zhang, Hongyan,Li, Lin,Li, Ning,et al. In situ FT-IR investigation on the selective catalytic reduction of NO with CH4 over Pd/sulfated alumina catalyst[J]. APPLIED CATALYSIS B-ENVIRONMENTAL,2011,110:171-177.
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