Oxidation of ammonia to nitrogen over Pt/Fe/ZSM5 catalyst: Influence of catalyst support on the low temperature activity

Kim, Min Sung; Lee, Dae Won; Chung, Sang Ho; Hong, Yoon Ki; Lee, Seong Ho; Oh, Seong Hoon; Cho, Il-Hyoung; Lee, Kwan Young

doi:10.1016/j.jhazmat.2012.08.026

Cited by 51 publications

(28 citation statements)

References 31 publications

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“…The main problem is related to development of the effective catalysts operating in the temperature of flue gases with high selectivity to dinitrogen. The catalytic systems studied in the process of selective ammonia oxidation [8] are divided into three main groups: (1) noble metals, which are active in relatively low temperatures but are low-selective to dinitrogen [9][10][11];…”

Section: Introductionmentioning

confidence: 99%

Ferrierite and Its Delaminated Forms Modified with Copper as Effective Catalysts for NH3-SCO Process

et al. 2020

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Ferrierites and their delaminated forms (ITQ-6), containing aluminum or titanium in the zeolite framework, were synthetized and modified with copper by an ion-exchange method. The obtained samples were characterized with respect to their chemical composition (ICP-OES), structure (XRD, UV-Vis DRS), textural parameters (N2-sorption), surface acidity (NH3-TPD), form and reducibility of deposited copper species (UV-Vis DRS and H2-TPR). Ferrierites and delaminated ITQ-6 zeolites modified with copper were studied as catalysts for the selective catalytic oxidation of ammonia to dinitrogen (NH3-SCO). It was shown that aggregated copper oxide species, which were preferentially formed on Ti-zeolites, were catalytically active in direct low-temperature ammonia oxidation to NO, while copper introduced into Al-zeolites was present mainly in the form of monomeric copper cations catalytically active in selective reduction of NO by ammonia to dinitrogen. It was postulated that ammonia oxidation in the presence of the studied catalysts proceeds according to the internal-selective catalytic reduction mechanism (i-SCR) and therefore the suitable ratio between aggregated copper oxide species and monomeric copper cations is necessary to obtain active and selective catalysts for the NH3-SCO process. Cu/Al-ITQ-6 presented the best catalytic properties possibly due to the most optimal ratio of these copper species.

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Section: Introductionmentioning

confidence: 99%

Ferrierite and Its Delaminated Forms Modified with Copper as Effective Catalysts for NH3-SCO Process

et al. 2020

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“…The effective SCO catalyst should operate in a relatively low temperature range (180-400°C) in order to reduce the operational costs connected with additional heating of waste streams [1,[7][8][9][10][11]. Moreover, it should selectively direct the reaction to the formation of the main products and should also be stable in the presence of water vapour or other typical components of flue gases such as COx and SOx [1,12].…”

Section: Introductionmentioning

confidence: 99%

Mesoporous Beta zeolite functionalisation with FexCry oligocations; catalytic activity in the NH3SCO process

Rutkowska

Duda

Macina

et al. 2019

Microporous and Mesoporous Materials

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In the presented studies H-Beta zeolite and H-Beta/meso (mesoporous Beta zeolite obtained by mesotemplate-free method) were modified with Fe3, Fe2Cr, FeCr2 and Cr3, triple-metallic aggregates (oligocations) by ion-exchange method (for comparison also modification with Fe isolated cations was done). Successful synthesis of mesoporous Beta zeolite was confirmed by several techniques such as N2-sorption, PXRD, AAS or NH3-TPD. Modified porosity and acidity of Beta zeolite, as well as the used source of metals, influenced the form (coordination and aggregation), content and reducibility of Fe-and Cr-species in the samples (UV-vis-DRS, AAS, H2-TPR). The obtained samples were tested as catalysts in the process of selective catalytic oxidation of ammonia to dinitrogen (NH3-SCO). The highest activity and selectivity

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“…However, despite several studies devoted to catalysts for a selective ammonia oxidation, a catalyst possessing high activity and selectivity over the required temperature range has not been presented yet. Major challenges are associated with the design of a suitable downstream catalyst: (i) the catalyst should exhibit high activity at relatively low temperatures (<400C) in order to avoid the need for additional heating of exhaust gases, (ii) the material has to possess sufficient stability in the presence of high concentrations of water vapour or other components of waste gases (COx, SOx) and (iii) should selectively convert NH3 into N2 [28,36,54]. Additionally, the NH3-SCR process was originally developed for stationary emission sources, mainly power plants, where the temperature of exhaust gases is relatively low and varies only in a narrow range of 250-400°C [55,56].…”

Section: Ammonia Slipstream Treatmentmentioning

confidence: 99%

“…28,79,85,116,186,187]. 37,54,105,142]. Investigations considering the influence of changes of the ammonia to oxygen molar ratio on the catalytic performance were only discussed in a limited number of publications [e.g.…”

Section: Effect Of Oxygen Contentmentioning

confidence: 99%

Copper based catalysts for the selective ammonia oxidation into nitrogen and water vapour—Recent trends and open challenges

Jabłońska

Palkovits

2016

Applied Catalysis B: Environmental

201

172

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Oxidation of ammonia to nitrogen over Pt/Fe/ZSM5 catalyst: Influence of catalyst support on the low temperature activity

Cited by 51 publications

References 31 publications

Ferrierite and Its Delaminated Forms Modified with Copper as Effective Catalysts for NH3-SCO Process

Ferrierite and Its Delaminated Forms Modified with Copper as Effective Catalysts for NH3-SCO Process

Mesoporous Beta zeolite functionalisation with FexCry oligocations; catalytic activity in the NH3SCO process

Copper based catalysts for the selective ammonia oxidation into nitrogen and water vapour—Recent trends and open challenges

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