Potential synergic effect between MOR and BEA zeolites in NOx SCR with methane: A dual bed design approach

Mendes‐Faia, Arlete; Matynia, Alexis; Toullec, Alain; Capela, Sandra; Ribeiro, M.F.; Henriques, Carlos; Costa, Patrick Da

doi:10.1016/j.apcata.2015.09.005

Cited by 9 publications

(11 citation statements)

References 35 publications

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“…Other strategies to further develop this catalyst might involve the addition of other metals [8] and combination of different material supports [18].…”

Section: Discussionmentioning

confidence: 99%

Application of PdCe-HMOR Catalyst as NOx CH4-SCR System for Heavy-Duty Vehicles Moved by Natural Gas

Mendes‐Faia

Lauga²,

Capela³

et al. 2016

Top Catal

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In this work a cobalt-free zeolite-based catalyst formulation is proposed for NO x CH 4 -SCR towards a commercial application of after-treatment system for heavy-duty vehicles moved by natural gas (lean-gas burn engines). PdCe-HMOR catalyst was characterised by H 2 -TPR, DRS UV-Vis and TEM/EDS. The effect of [CH 4 ]/ [NO] in the gas feed was studied in order to assess the catalytic performance under simulated dynamic engine conditions. The catalyst was also tested with a representative gas feed of real exhaust gases of a heavy-duty vehicle's engine (lean-burn conditions) powered by natural gas.

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“…Other strategies to further develop this catalyst might involve the addition of other metals [8] and combination of different material supports [18].…”

Section: Discussionmentioning

confidence: 99%

Application of PdCe-HMOR Catalyst as NOx CH4-SCR System for Heavy-Duty Vehicles Moved by Natural Gas

Mendes‐Faia

Lauga²,

Capela³

et al. 2016

Top Catal

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“…Practically, a significant difference is indicated, particularly in the case of the relative contents of zeolite Y in the composites between 0.2 and 0.5. In all cases, a positive synergic effect for NO to N2 conversion is observed over the core-shell composite catalysts [18].…”

Section: Catalytic Activity Studiesmentioning

confidence: 83%

“…In fact, zeolitic composites with different porous structure have shown the special synergic effects in catalysis [15][16][17]. CH 4 -SCR reactivity of the catalysts based on two different zeolite structures (MOR and BEA) containing Pd and Ce was reported [18]. Compared to each individual-zeolite catalyst, the catalytic performance of the zeolite composite was significantly improved because of the synergic effects of the zeolites.…”

Section: Introductionmentioning

confidence: 99%

NO-CH4-SCR Over Core-Shell MnH-Zeolite Composites

Wang

et al. 2019

Applied Sciences

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Selective catalytic reduction of NO with methane (NO-CH4-SCR) in the presence of excess oxygen was investigated over the synthesized MnH-ZZs-n zeolite composite catalysts with FAU (as core) and BEA (as shell) topologies. XRD, SEM, and NH3-TPD technologies were employed to characterize the catalysts. It is found that the topological structure of the zeolite affected the catalytic properties and H2O/SO2 tolerances considerably. MnH-ZZs-n catalysts exhibited much higher NO-CH4-SCR activity than the physical mixture catalysts with comparable relative mass content of Y and Beta zeolites, particularly the ratio of Y and Beta at the range of 0.2–0.5 than the MnH-Beta catalysts with single topology. NH3-TPD results showed that one new type of strong acidic sites formed in H-ZZs-n and remained in MnH-ZZs-n resulted from the interaction between the Lewis and Brönsted acid sites under a particular environment. The special zeolite-zeolite structure with ion-exchanged Mn ions in the core-shell zeolite composite catalysts contributed to the novel NO-CH4-SCR properties.

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“…Except catalyst, these reactions are affected by the concentration of NO and O 2 in the feed gas stream [7][8][9], the temperature of reaction [10,11], water content [12,13], and sulfur, [14,15] etc. In these three technologies, the key step is the decomposition of adsorbed NO to produce adsorbed N 2 O.…”

Section: Introductionmentioning

confidence: 99%

“…Oxygen preferentially oxidizes CO to CO 2 and inhibits CO-NO rection to reduce NO removal efficiency in the CO-SCR process [19,20]. However, in the CH 4 -SCR process, the inhibition of oxygen is different from that of CO-NO reaction; oxygen plays a dual role of positive (promoting adsorption) and negative (suppressing reduction) in the NO reaction process [7,8]. The negative effect of oxygen on NO removal efficiency stems from the competitive reaction of oxygen and NO with respect to CH 4 , and the oxygen in the flue gas is an essential factor for the oxidation of NO to the catalyst surface.…”

Section: Introductionmentioning

confidence: 99%

State-of-Art Review of NO Reduction Technologies by CO, CH4 and H2

et al. 2021

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Removal of nitrogen oxides during coal combustion is a subject of great concerns. The present study reviews the state-of-art catalysts for NO reduction by CO, CH4, and H2. In terms of NO reduction by CO and CH4, it focuses on the preparation methodologies and catalytic properties of noble metal catalysts and non-noble metal catalysts. In the technology of NO removal by H2, the NO removal performance of the noble metal catalyst is mainly discussed from the traditional carrier and the new carrier, such as Al2O3, ZSM-5, OMS-2, MOFs, perovskite oxide, etc. By adopting new preparation methodologies and introducing the secondary metal component, the catalysts supported by a traditional carrier could achieve a much higher activity. New carrier for catalyst design seems a promising aspect for improving the catalyst performance, i.e., catalytic activity and stability, in future. Moreover, mechanisms of catalytic NO reduction by these three agents are discussed in-depth. Through the critical review, it is found that the adsorption of NOx and the decomposition of NO are key steps in NO removal by CO, and the activation of the C-H bond in CH4 and H-H bonds in H2 serves as a rate determining step of the reaction of NO removal by CH4 and H2, respectively.

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Potential synergic effect between MOR and BEA zeolites in NOx SCR with methane: A dual bed design approach

Cited by 9 publications

References 35 publications

Application of PdCe-HMOR Catalyst as NOx CH4-SCR System for Heavy-Duty Vehicles Moved by Natural Gas

Application of PdCe-HMOR Catalyst as NOx CH4-SCR System for Heavy-Duty Vehicles Moved by Natural Gas

NO-CH4-SCR Over Core-Shell MnH-Zeolite Composites

State-of-Art Review of NO Reduction Technologies by CO, CH4 and H2

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