NO reduction by CO over a Fe-based catalyst in FCC regenerator conditions

Li, Jun; Wang, Shan; Zhou, Li; Li, Guohua; Wei, Fei

doi:10.1016/j.cej.2014.06.015

Cited by 57 publications

(24 citation statements)

References 45 publications

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“…The SCR catalysts with good adsorption capacity and reduction of NO x are important for ICFB reactor. Fe-containing catalysts have attracted much attention for NO-SCR [13][14][15][16] and NO x storage/reduction (NSR) [17], due to the low production of N 2 O [13] and high adsorption capacity of NO x [16]. In our previous study [18], Fe/ZSM-5 (Albemarle) exhibited unsatisfactory performance for NO x adsorption and catalytic reduction, although the adsorption capacity of the fine Fe/ZSM-5 (Albemarle) catalyst is 11.4 times that of fine Fe/ZSM-5 (PUC) at the same operating conditions.…”

Section: Introductionmentioning

confidence: 99%

NOx adsorption and reduction with C3H6 over Fe/zeolite catalysts: Effect of catalyst support

Pan

Guo

2015

Chemical Engineering Journal

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Section: Introductionmentioning

confidence: 99%

NOx adsorption and reduction with C3H6 over Fe/zeolite catalysts: Effect of catalyst support

Pan

Guo

2015

Chemical Engineering Journal

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“…Researchers have focused on the development of substitute technologies to avoid these disadvantages. One potential process is NO removal by CO because carbon monoxide is cheap, readily available, and does not generate carbon deposits in the CO+NO reaction . Furthermore, this process exhibits remarkable denitration (deNO x ) activity in the absence of O 2 .…”

Section: Introductionmentioning

confidence: 99%

NO reduction by CO over iron‐based catalysts supported by activated semi‐coke

et al. 2016

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Activated semi‐coke was developed and loaded by iron species and other assistant metals (Co, La, and Ce) using a hydrothermal method to obtain the abatement of NOx emissions from power plants and then used for NO removal by CO. These catalysts were systematically characterized by N2 physisorption, scanning electron microscopy, X‐ray diffraction, X‐ray photoelectron spectroscopy, in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), and the activity of NOx reduction. The results showed that the activated semi‐coke that was loaded by Fe species could achieve an excellent NOx conversion of 96.5 % at 350 °C with 0.2 g/g (20 wt%) of the precursor content (catalyst denoted as Fe20/ASC). This was ascribed to higher amounts of surface Fe3+ and chemisorbed oxygen. Furthermore, Co was the best promoter among Co, La, and Ce. This enhancement was attributed to the increase of the specific surface area and chemisorbed oxygen, as well as the formation of CoFe2O4. The synergistic effect between Fe and Co species was beneficial for the formation of oxygen vacancies, which could promote the adsorption and dissociation of NO. The in situ DRIFTS results indicated that the reaction for NOx removal by CO over activated semi‐coke supported catalysts mainly occurred between coordinated nitrates/nitryls and the adsorbed COx species.

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“…In presence of oxygen, the NO-CO reaction will not happen until the oxygen concentration is below a threshold value due to the stronger adsorption ability of oxygen than NO [19]. The reduction of NO by CO is promoted by the increase of CO concentration, but it is limited by the increase of oxygen concentration.…”

Section: Effect Of New Carriersmentioning

confidence: 99%

“…Oxygen in the flue gas plays an important role in NOx removal by CO-SCR, CH 4 -SCR, and H 2 -SCR. 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].…”

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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NO reduction by CO over a Fe-based catalyst in FCC regenerator conditions

Cited by 57 publications

References 45 publications

NOx adsorption and reduction with C3H6 over Fe/zeolite catalysts: Effect of catalyst support

NOx adsorption and reduction with C3H6 over Fe/zeolite catalysts: Effect of catalyst support

NO reduction by CO over iron‐based catalysts supported by activated semi‐coke

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

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