Deactivation Mechanism of Potassium on the V2O5/CeO2 Catalysts for SCR Reaction: Acidity, Reducibility and Adsorbed-NOx

被引：154
作者：
Peng, Yue [1 ]
Li, Junhua [1 ,2 ]
Huang, Xu [1 ]
Li, Xiang [1 ]
Su, Wenkang [1 ]
Sun, Xiaoxu [1 ]
Wang, Dezhi [3 ]
Hao, Jiming [1 ,2 ]
机构：
[1] Tsinghua Univ, Sch Environm, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100084, Peoples R China
[2] Tsinghua Univ, State Environm Protect Key Lab Sources & Control, Beijing 100084, Peoples R China
[3] Beijing Guodian Longyuan Environm Engn Co LTD, Beijing 100084, Peoples R China
来源：
ENVIRONMENTAL SCIENCE & TECHNOLOGY | 2014年 / 48卷 / 08期
基金：
中国国家自然科学基金;
关键词：
DEFINED SURFACE PLANES; CHEMICAL DEACTIVATION; RAMAN-SPECTROSCOPY; CEO2; NANOCRYSTALS; LUBRICATION OILS; UREA SOLUTION; NITRIC-OXIDE; REDUCTION; AMMONIA; ALKALI;
D O I：
10.1021/es405602a
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 V2O5/CeO2 catalysts with different potassium loadings were prepared to investigate alkali deactivations for selective catalytic reduction of NOx with NH3. An alkali poisoning mechanism could be attributed to surface acidity, reducibility, and NOx adsorption/desorption behaviors. The detailed factors are as follows: (1) decrease of surface acidity suppresses NH3 adsorption by strong bonding of alkali to vanadia (major factor); (2) low reducibility prohibits NH3 activation and NO oxidation by formation bonding of alkali to vanadia and ceria (important factor); (3) active NOx- species at low temperature diminish because of coverage of alkali on the surfaces (minor factor); and (4) stable, inactive nitrate species at high temperature increase by generating new basic sites (important factor).
引用
收藏
页码：4515 / 4520
页数：6
相关论文
共 27 条
[1]   Chemical and mechanistic aspects of the selective catalytic reduction of NOx by ammonia over oxide catalysts:: A review [J].
Busca, G ;
Lietti, L ;
Ramis, G ;
Berti, F .
APPLIED CATALYSIS B-ENVIRONMENTAL, 1998, 18 (1-2) :1-36
[2]   Effect of alkali doping on a V2O5/TiO2 catalyst from periodic DFT calculations [J].
Calatayud, M. ;
Minot, C. .
JOURNAL OF PHYSICAL CHEMISTRY C, 2007, 111 (17) :6411-6417
[3]   A "Nitrate Route'' for the low temperature "Fast SCR'' reaction over a V2O5-WO3/TiO2 commercial catalyst [J].
Ciardelli, C ;
Nova, I ;
Tronconi, E ;
Chatterjee, D ;
Bandl-Konrad, B .
CHEMICAL COMMUNICATIONS, 2004, (23) :2718-2719
[4]   New "Enhanced NH3-SCR" Reaction for NOx Emission Control [J].
Forzatti, Pio ;
Nova, Isabella ;
Tronconi, Enrico .
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 2010, 49 (21) :10386-10391
[5]   Molecular structure and catalytic activity of V2O5/TiO2 catalysts for the SCR of NO by NH3:: In situ Raman spectra in the presence of O2, NH3, NO, H2, H2O, and SO2 [J].
Giakoumelou, I ;
Fountzoula, C ;
Kordulis, C ;
Boghosian, S .
JOURNAL OF CATALYSIS, 2006, 239 (01) :1-12
[6]   Structural Investigation of Activated Lattice Oxygen in Ce1-xSnxO2 and Ce1-x-ySnxPdyO2-δ by EXAFS and DFT calculation [J].
Gupta, Asha ;
Hegde, M. S. ;
Priolkar, K. R. ;
Waghmare, U. V. ;
Sarode, P. R. ;
Emura, S. .
CHEMISTRY OF MATERIALS, 2009, 21 (24) :5836-5847
[7]   Identification of neutral and charged NxOy surface species by IR spectroscopy [J].
Hadjiivanov, KI .
CATALYSIS REVIEWS-SCIENCE AND ENGINEERING, 2000, 42 (1-2) :71-144
[8]   The role of K2O in the selective reduction of NO with NH3 over a V2O5(WO3)/TiO2 commercial selective catalytic reduction catalyst [J].
Kamata, H ;
Takahashi, K ;
Odenbrand, CUI .
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL, 1999, 139 (2-3) :189-198
[9]   Chemical deactivation of V2O5/WO3-TiO2 SCR catalysts by additives and impurities from fuels, lubrication oils, and urea solution -: I.: Catalytic studies [J].
Kroecher, Oliver ;
Elsener, Martin .
APPLIED CATALYSIS B-ENVIRONMENTAL, 2008, 77 (3-4) :215-227
[10]   POTASSIUM DOPING OF VANADIA/TITANIA DE-NO(X)ING CATALYSTS - SURFACE CHARACTERIZATION AND REACTIVITY STUDY [J].
LIETTI, L ;
FORZATTI, P ;
RAMIS, G ;
BUSCA, G ;
BREGANI, F .
APPLIED CATALYSIS B-ENVIRONMENTAL, 1993, 3 (01) :13-35
123