Recent advances in automotive catalysis for NOx emission control by small-pore microporous materials

被引:809
作者
Beale, A. M. [1 ,2 ]
Gao, F. [3 ]
Lezcano-Gonzalez, I. [1 ,2 ]
Peden, C. H. F. [3 ]
Szanyi, J. [3 ]
机构
[1] UCL, Dept Chem, London WC1H 0AJ, England
[2] Rutherford Appleton Lab, Res Complex Harwell, UK Catalysis Hub, Didcot OX11 0FA, Oxon, England
[3] Pacific NW Natl Lab, Inst Integrated Catalysis, Richland, WA 99352 USA
基金
英国工程与自然科学研究理事会;
关键词
STATE ION-EXCHANGE; IN-SITU DRIFTS; ZEOLITE-BASED CATALYSTS; ISOLATED CU2+ IONS; X-RAY-ABSORPTION; NITRIC-OXIDE; ACTIVE-SITES; CU-SSZ-13; CATALYST; SSZ-13; ZEOLITE; OXIDATION SCO;
D O I
10.1039/c5cs00108k
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The ever increasing demand to develop highly fuel efficient engines coincides with the need to minimize air pollution originating from the exhaust gases of internal combustion engines. Dramatically improved fuel efficiency can be achieved at air-to-fuel ratios much higher than stoichiometric. In the presence of oxygen in large excess, however, traditional three-way catalysts are unable to reduce NOx. Among the number of lean-NOx reduction technologies, selective catalytic reduction (SCR) of NOx by NH3 over Cu-and Fe-ion exchanged zeolite catalysts has been extensively studied over the past 30+ years. Despite the significant advances in developing a viable practical zeolite-based catalyst for lean NOx reduction, the insufficient hydrothermal stabilities of the zeolite structures considered cast doubts about their real-world applicability. During the past decade renewed interest in zeolite-based lean NOx reduction was spurred by the discovery of the very high activity of Cu-SSZ-13 (and the isostructural Cu-SAPO-34) in the NH3-SCR of NOx. These new, small-pore zeolite-based catalysts not only exhibited very high NOx conversion and N-2 selectivity, but also exhibited exceptionally high hydrothermal stability at high temperatures. In this review we summarize the key discoveries of the past similar to 5 years that led to the introduction of these catalysts into practical applications. This review first briefly discusses the structure and preparation of the CHA structure-based zeolite catalysts, and then summarizes the key learnings of the rather extensive (but not complete) characterisation work. Then we summarize the key findings of reaction kinetic studies, and provide some mechanistic details emerging from these investigations. At the end of the review we highlight some of the issues that still need to be addressed in automotive exhaust control catalysis.
引用
收藏
页码:7371 / 7405
页数:35
相关论文
共 196 条
[1]   FTIR investigations of the adsorption and disproportionation of NO on Cu-exchanged silicoaluminophosphate of type 34 [J].
Akolekar, DB ;
Bhargava, SK ;
Foger, K .
JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS, 1998, 94 (01) :155-160
[2]   NO and CO adsorption studies on transition metal-exchanged silico-aluminophosphate of type 34 catalysts [J].
Akolekar, DB ;
Bhargava, SK .
APPLIED CATALYSIS A-GENERAL, 2001, 207 (1-2) :355-365
[3]   Use of different templates on SAPO-34 synthesis: Effect on the acidity and catalytic activity in the MTO reaction [J].
Alvaro-Munoz, Teresa ;
Marquez-Alvarez, Carlos ;
Sastre, Enrique .
CATALYSIS TODAY, 2012, 179 (01) :27-34
[4]   A study of the mechanism of selective conversion of ammonia to nitrogen on Ni/γ-Al2O3 under strongly oxidising conditions [J].
Amblard, M ;
Burch, R ;
Southward, BWL .
CATALYSIS TODAY, 2000, 59 (3-4) :365-371
[5]   Location of Cu2+ in CHA zeolite investigated by X-ray diffraction using the Rietveld/maximum entropy method [J].
Andersen, Casper Welzel ;
Bremholm, Martin ;
Vennestrom, Peter Nicolai Ravnborg ;
Blichfeld, Anders Bank ;
Lundegaard, Lars Fahl ;
Iversen, Bo Brummerstedt .
IUCRJ, 2014, 1 :382-386
[6]  
Andersen P. J., 2011, US Pat., Patent No. [7,998,443B2, 7998443B2]
[7]  
Andersen P.J., 2008, PCT, Patent No. [WO/2008/132452, 2008132452, WO 2008/132452]
[8]  
[Anonymous], 2009, ELECT PARAMAGNETIC R
[9]   Identification of the active Cu site in standard selective catalytic reduction with ammonia on Cu-SSZ-13 [J].
Bates, Shane A. ;
Verma, Anuj A. ;
Paolucci, Christopher ;
Parekh, Atish A. ;
Anggara, Trunojoyo ;
Yezerets, Aleksey ;
Schneider, William F. ;
Miller, Jeffrey T. ;
Delgass, W. Nicholas ;
Ribeiro, Fabio H. .
JOURNAL OF CATALYSIS, 2014, 312 :87-97
[10]   Chemical imaging of the sulfur-induced deactivation of Cu/ZnO catalyst bodies [J].
Beale, Andrew M. ;
Gibson, Emma K. ;
O'Brien, Matthew G. ;
Jacques, Simon D. M. ;
Cernik, Robert J. ;
Di Michiel, Marco ;
Cobden, Paul D. ;
Pirgon-Galin, Ozlem ;
van de Water, Leon ;
Watson, Michael J. ;
Weckhuysen, Bert M. .
JOURNAL OF CATALYSIS, 2014, 314 :94-100