N2O formation in the selective catalytic reduction of NOx with NH3 on a CeMoOx catalyst

Wang, Jihui; Cui, Hongli; Dong, Xuesong; Zhao, Huawang; Wang, Yujie; Chen, Hong; Yao, Mingfa; Li, Yongdan

doi:10.1016/j.apcata.2015.07.030

Cited by 26 publications

(23 citation statements)

References 42 publications

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“…(1) At low temperatures below 250 C, Reactions (1)-( 7) are the reaction routes for NO removal. HON from Reaction ( 6) is the intermediate for N2O formation, which is in agreement with earlier reports [7,8]. (2) At high temperatures above 250 C, Reactions ( 5) and ( 8)-( 15) are the reaction routes for NO abatement, and Reaction (15) is the only route for N2O formation.…”

Section: Resultssupporting

confidence: 91%

“…The combination of two formed HON species through Reaction (7) leads to the formation of N2O; simultaneously, HON can also react with H• to generate N2, as described in Reaction (8). Thus, excessive H• species promote Reaction (8), reducing the formation of N2O from Reaction (7); this is in good agreement with the catalytic performance tests under molar ratios of NO/NH3 below 1.5:1, as presented in Figs. 4 and 5.…”

Section: Resultssupporting

confidence: 87%

“…Low-temperature selective catalytic reduction of NO with NH3 (NH3-SCR) was advocated to be a preferential method for the abatement of NOx emitted from the flue gas in steel, cement, glass, and other non-power-plant industries [3][4][5][6]. However, the formation of undesired by-products of N2O during the low-temperature NH3-SCR process is a great constraint because of their greenhouse effect and potential for the destruction of the stratospheric ozone layer [7]. Therefore, detailed knowledge of the mechanism of N2O formation during the NO abatement by low-temperature NH3-SCR is indispensable for the rational design of effective catalysts with good N2 selectivity.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Mechanistic insight into N2O formation during NO reduction by NH3 over Pd/CeO2 catalyst in the absence of O2

Sheng

Chen

et al. 2019

Chinese Journal of Catalysis

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Section: Resultssupporting

confidence: 91%

Section: Resultssupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Mechanistic insight into N2O formation during NO reduction by NH3 over Pd/CeO2 catalyst in the absence of O2

Sheng

Chen

et al. 2019

Chinese Journal of Catalysis

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“…As reported by Wang et al (2015), N 2 O is the major byproduct of the deNO x NH 3 -SCR process, regardless of the type of the catalyst used. In general, there are three main pathways for N 2 O formation during NH 3 -SCR process (Lietti et al 1999;Yates et al 2005;Martín et al 2007):…”

Section: Dual-bed Catalytic Systemmentioning

confidence: 56%

The influence of NOx presence on the catalytic N2O decomposition over the supported double-promoted cobalt spinel catalyst

et al. 2019

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The supported double-promoted cobalt spinel catalyst has been tested for N 2 O decomposition in the model and real gas streams (tail gas) from nitric acid plant. Activity tests carried out in the model gas stream showed a high activity of the developed supported catalyst. However, during catalytic investigations performed under real industrial conditions it was found that this catalyst is very sensitive to NO x poisoning. The negative influence of these oxides is visible even at their low concentration. However, the stability tests performed in real nitric acid plant gas streams showed that the developed catalyst preserves its initial activity for at least 40 days. Therefore, the authors propose to apply it in a dual-bed catalytic system consisting of deNO x and deN 2 O catalyst beds. At the first stage, tail gas is purified from NO x in the NH 3-SCR process in the presence of commercial catalyst and at the second stage, catalytic decomposition of N 2 O into N 2 and O 2 takes place over the developed supported cobalt spinel catalyst. The deNO x catalyst bed applied in the proposed dual-bed catalytic system allowed for the complete conversion of NO x from the tail gases. After installation of the supported cobalt spinel catalyst downstream of the deNO x catalyst bed, a significant increase in deN 2 O catalyst activity in the real tail gas stream was observed. Under optimal conditions, this system (F = 150 L/h; T = 425-450 °C) allowed for the complete reduction of N 2 O emission. It is shown that the proposed catalytic system is robust and allows to obtain high conversions of both NO x and N 2 O.

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“…CeO 2 ‐based materials have been extensively investigated for the various application because of its excellent redox ability due to its easily alternating oxidative state between Ce 3+ and Ce 4+ . [ 30 ] These characteristics facilitate the storage and release of oxygen, increasing the oxygen vacancies (Ce 3+ ‐X, X represent the oxygen vacancy), and the active lattice oxygen (Ce 4+ ‐O*) in CeO 2. [ 31,32 ] Complex chemical reactions were found to occur during the NO adsorption on CeO 2 .…”

Section: Metal Oxide Support Catalystsmentioning

confidence: 99%

Recent advances in catalytic automotive emission control: Passive NO storage at low temperatures

Wang

Yong

Rong

et al. 2020

J Chinese Chemical Soc

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In the practical applications, a high portion of the NO x is emitted without purification in the cold start period of engine because the selective catalytic reduction (SCR) or NO x storage and reduction (NSR) catalysts are not warmed up. Passive NO x absorbers (PNA) were proposed earlier to store the NO x at low temperatures and release the stored NO x during warm-up period when the SCR and NSR catalysts downstream are functional, while this concept just attracted great interests recently to meet the extra stringent requirement of governmental emissions regulations. A plant of PNA catalysts, showing different NO adsorption/release characteristics, was disclosed. This review summarizes the recent progress in the development of PNA catalysts. The characteristics of NO adsorption/release on precious metal (i.e., Pt, Pd) loading Al 2 O 3 support catalysts, CeO 2 support catalysts, and zeolite support catalysts are summarized and compared.

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N2O formation in the selective catalytic reduction of NOx with NH3 on a CeMoOx catalyst

Cited by 26 publications

References 42 publications

Mechanistic insight into N2O formation during NO reduction by NH3 over Pd/CeO2 catalyst in the absence of O2

Mechanistic insight into N2O formation during NO reduction by NH3 over Pd/CeO2 catalyst in the absence of O2

The influence of NOx presence on the catalytic N2O decomposition over the supported double-promoted cobalt spinel catalyst

Recent advances in catalytic automotive emission control: Passive NO storage at low temperatures

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