Potential reaction intermediates of NOx reduction with propane over Cu/ZSM-5

Beutel, T.; Adelman, Brad; Lei, G.D.; Sachtler, W. M. H.

doi:10.1007/bf00806103

Cited by 66 publications

(23 citation statements)

References 15 publications

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“…Li and Armor [15] and Li et al [16] and Lukyanov et al [17] provided strong evidence that the role of oxygen was to convert NO into NO 2 , and it was NO 2 that reacted with CH 4 . The important role of the adsorbed NO x in the SCR was further confirmed by Beutel et al [18], Bethke et al [28], and Yokoyama and Misono [29,30]. In Section 3.3, the assumption about the participation of adsorbed NO x in the reaction scheme is further studied through NO x -TPD and -TPR measurements.…”

Section: Effect Of Feed Gas Compositionsmentioning

confidence: 68%

“…In the oxidizing atmosphere, CH 4 selectively reacts with NO x instead of being completely combusted with O 2 over H-ZSM-5 containing Co, Mn, Ga, In, and Pd catalysts [1][2][3][4][5][6][7][8][9][10]. NO 2 formation on the catalyst surfaces is thought to be a necessary step in the SCR, and the presence of O 2 is needed to form this active NO x species [15][16][17][18]. Such conclusions are supported by the lower rate of NO/hydrocarbon reaction and a similar rate of NO 2 /hydrocarbon reaction as compared with the NO/O 2 /hydrocarbon reaction.…”

Section: Introductionmentioning

confidence: 99%

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On the selectively catalytic reduction of NOx with methane over Ag-ZSM-5 catalysts

Shi

Cheng

et al. 2002

Applied Catalysis B: Environmental

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Section: Effect Of Feed Gas Compositionsmentioning

confidence: 68%

Section: Introductionmentioning

confidence: 99%

On the selectively catalytic reduction of NOx with methane over Ag-ZSM-5 catalysts

Shi

Cheng

et al. 2002

Applied Catalysis B: Environmental

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“…Many studies suggest that lean-NO x SCR proceeds via oxidation of NO to NO 2 by oxygen, followed by the reaction of the NO 2 with hydrocarbons [3][4][5][6][7][8][9][10][11][12][13]. On catalysts that are not very effective in catalyzing the equilibration of NO+O 2 and NO 2 , the rate of N 2 formation is substantially higher when the input NO x is NO 2 instead of NO.…”

Section: Significance Of No 2 In Lean-no X Scrmentioning

confidence: 99%

“…The metastable oxygen atom, O( 1 D), will react with H 2 O to also produce OH radicals via reaction (6). These OH radicals will decompose the hydrocarbons, for example via reactions (12) and (13), and produce hydrocarbon radicals that convert NO to NO 2 in the presence of O 2 .…”

Section: Plasma Processmentioning

confidence: 99%

Plasma-Assisted Catalytic Reduction of NOx

Penetrante

Brusasco

Merritt

et al. 1998

SAE Technical Paper Series

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August 24, 1998This is a preprint of a paper intended for publication in a journal or proceedings. Since changes may be made before publication, this preprint is made available with the understanding that it will not be cited or reproduced without the permission of the author. PREPRINTThis paper was prepared for submittal to the DISCLAIMER This document was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor the University of California nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or the University of California. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or the University of California, and shall not be used for advertising or product endorsement purposes. ABSTRACTMany studies suggest that lean-NO x SCR proceeds via oxidation of NO to NO 2 by oxygen, followed by the reaction of the NO 2 with hydrocarbons. On catalysts that are not very effective in catalyzing the equilibration of NO+O 2 and NO 2 , the rate of N 2 formation is substantially higher when the input NO x is NO 2 instead of NO. The apparent bifunctional mechanism in the SCR of NO x has prompted the use of mechanically mixed catalyst components, in which one component is used to accelerate the oxidation of NO to NO 2 , and another component catalyzes the reaction between NO 2 and the hydrocarbon. Catalysts that previously were regarded as inactive for NO x reduction could therefore become efficient when mixed with an oxidation catalyst. Preconverting NO to NO 2 opens the opportunity for a wider range of SCR catalysts and perhaps improves the durability of these catalysts. This paper describes the use of a non-thermal plasma as an efficient means for selective partial oxidation of NO to NO 2 . When combined with some types of SCR catalyst, the plasma can greatly enhance the NO x reduction and eliminate some of the deficiencies encountered in an entirely catalyst-based approach.

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“…While dearth of appreciable catalytic activity in reactions of (NO + H 2 + CO + O 2 ) is typical for SCR catalysts [1,2,38,43,44], they are usually highly active for the oxidation of NO to NO 2 which is believed to be a major reaction step in the SCR process over most catalysts [2,19,20,[45][46][47][48][49][50][51][52]. Data in Table 1 demonstrate that the In-SMMC is only slightly active for the oxidation of NO even in the presence of a large excess of O 2 .…”

Section: Reaction Of No and Omentioning

confidence: 99%

Mechanistic Studies and Design of Highly Active Cuprate Catalysts for the Direct Decomposition and Selective Reduction of Nitric Oxide and Hydrocarbons to Nitrogen for Abatement of Stack Emissions

1998

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A flow trough type catalytic reactor system was adequately modified for NO related catalytic and adsorption measurements, including the on-line connection of a digital chemiluminescent NO-NO x analyzer to the reactor outlet system. Moreover, we have largely completed the installation of an FTIR coupled catalytic system containing a HTEC cell for high temperature DRIFT studies. Three different barium cuprate samples, Ba 2 CuO 3 , BaCuO 2 , and Ba 2 Cu 3 O 5 were synthesized and characterized by powder XRD for catalytic tests. Prior to catalytic studies over these cuprates, a new, liquid indium based supported molten metal catalyst (In-SMMC) was tested in the reduction of NO by various reductants. In the presence of excess O 2 and H 2 O, the In-SMMC proved to be more active for the selective catalytic reduction (SCR) of NO to N 2 by ethanol than most other catalysts. Using C 1 -C 3 alcohols as reductants, self sustained periodic oscillations observed in the NO x concentrations of reactor effluents indicated the first time that radical intermediates can be involved in the SCR of NO by alcohols. Further, In-SMMC is the only effective and water tolerant SCR catalyst reported thus far which contains SiO 2 support. Thus, this novel catalyst opens up a promising new alternative for developing an effective and durable catalyst for NO x abatement in stack emission.

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Potential reaction intermediates of NOx reduction with propane over Cu/ZSM-5

Cited by 66 publications

References 15 publications

On the selectively catalytic reduction of NOx with methane over Ag-ZSM-5 catalysts

On the selectively catalytic reduction of NOx with methane over Ag-ZSM-5 catalysts

Plasma-Assisted Catalytic Reduction of NOx

Mechanistic Studies and Design of Highly Active Cuprate Catalysts for the Direct Decomposition and Selective Reduction of Nitric Oxide and Hydrocarbons to Nitrogen for Abatement of Stack Emissions

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