Hybrid catalysts for the selective catalytic reduction (SCR) of NO by NH3• On the role of fast SCR in the reaction network

被引：46

作者：

Salazar, Mariam ^{[1
,2
]}

Hoffmann, Stefanie ^{[1
,3
]}

Singer, Vera ^{[1
]}

Becker, Ralf ^{[1
,4
]}

Gruenert, Wolfgang ^{[1
]}

机构：

[1] Ruhr Univ Bochum, Lehrstuhl Tech Chem, POB 102148, D-44780 Bochum, Germany

[2] Oak Ridge Natl Lab, Knoxville, TN USA

[3] Univ Duisburg Essen, Campus Essen, D-45141 Essen, Germany

[4] Huntsman Pigments & Addit Germany GmbH, D-47198 Duisburg, Germany

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2016年 / 199卷

关键词：

Standard SCR; Ammonia; Hybrid catalysts; Reaction network; Fast SCR; NO/NO2; MIXTURES; NITROGEN-OXIDES; ACTIVE-SITES; FE-ZSM-5; ZEOLITES; AMMONIA; SPECTROSCOPY; PERFORMANCE; MECHANISM; NH3;

D O I：

10.1016/j.apcatb.2016.06.043

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：

The SCR of NO by NH3 was studied with hybrid catalysts, in which an oxidation component (Mn-Cu or Ce-Zr mixed oxides) and SCR catalysts of different activities in fast SCR (Fe-ZSM-5 of different Fe content and H-ZSM-5) are combined in physical mixtures. Fast SCR, which is SCR of NO2/NO mixtures, is believed to be the final step of the reaction mechanism causing the synergy and being initiated by NO2 formation over the oxidation component. In our studies, no correlation between fast-SCR activity of the SCR component and the performance of the hybrid was observed. In addition, a hybrid catalyst was found that provided rates of standard SCR significantly exceeding rates in fast SCR achieved by the SCR component alone in a wide temperature range. Therefore, fast SCR is not part of the reaction sequence causing the drastic synergetic effects between the components. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：433 / 438

页数：6

共 16 条

[11] The role of NO2 in the selective catalytic reduction of nitrogen oxides over Fe-ZSM-5 catalysts: Active sites for the conversion of NO and of NO/NO2 mixtures [J].

Schwidder, Michael ;

Heikens, Sascha ;

De Toni, Andrea ;

Geisler, Simone ;

Berndt, Malte ;

Brueckner, Angelika ;

Gruenert, Wolfgang .

JOURNAL OF CATALYSIS, 2008, 259 (01) :96-103

[12] CHARACTERIZATION OF COPPER-EXCHANGED NA-A-ZEOLITES, X-ZEOLITES AND Y-ZEOLITES WITH X-RAY PHOTOELECTRON-SPECTROSCOPY AND TRANSMISSION ELECTRON-MICROSCOPY [J].

SEXTON, BA ;

SMITH, TD ;

SANDERS, JV .

JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA, 1985, 35 (1-2) :27-43

[13] Combined catalytic systems for enhanced low-temperature NOx abatement [J].

Stakheev, A. Yu ;

Mytareva, A. I. ;

Bokarev, D. A. ;

Baeva, G. N. ;

Krivoruchenko, D. S. ;

Kustov, A. L. ;

Grill, M. ;

Thogersen, J. R. .

CATALYSIS TODAY, 2015, 258 :183-189

[14] Integrated DeNO x -DeSoot Catalytic Systems with Improved Low-Temperature Performance [J].

Stakheev, A. Yu ;

Baeva, G. N. ;

Bragina, G. O. ;

Teleguina, N. S. ;

Kustov, A. L. ;

Grill, M. ;

Thogersen, J. R. .

TOPICS IN CATALYSIS, 2013, 56 (1-8) :427-433

[15] Identifying active sites for fast NH3-SCR of NO/NO2 mixtures over Fe-ZSM-5 by operando EPR and UV-vis spectroscopy [J].

Velez, Roxana Perez ;

Ellmers, Inga ;

Huang, Heming ;

Bentrup, Ursula ;

Schuenemann, Volker ;

Gruenert, Wolfgang ;

Brueckner, Angelika .

JOURNAL OF CATALYSIS, 2014, 316 :103-111

[16] Selective catalytic reduction of NOx with NH3 over zeolite H-ZSM-5:: influence of transient ammonia supply [J].

Wallin, M ;

Karlsson, CJ ;

Skoglundh, M ;

Palmqvist, A .

JOURNAL OF CATALYSIS, 2003, 218 (02) :354-364

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