In situ DRIFTS investigation on the SCR of NO with NH3 over V2O5 catalyst supported by activated semi-coke

Wang, Jinping; Zheng, Yan; Liu, Huan; Chen, Yan; Zhang, Zuotai; Wang, Xidong

doi:10.1016/j.apsusc.2014.06.043

Cited by 151 publications

(73 citation statements)

References 70 publications

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“…Produced CO 2 /oxidized CO Note: Equations (1-4) are for the catalytic activity test in fixed bed and equations (5)(6)(7)(8)(9)(10)(11)(12)(13)(14) are applied for simulated rotary reactor. showing an enhanced NO reduction efficiency at higher temperature.…”

Section: Co Slippingmentioning

confidence: 99%

Nitrogen oxides reduction by carbon monoxide over semi-coke supported catalysts in a simulated rotary reactor: reaction performance under dry conditions

et al. 2016

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A novel rotary reactor was proposed for nitrogen oxides (NO x ) reduction by carbon monoxides (CO) in order to avoid the oxygen inhibition effect. NO x adsorption and reduction were separated into two different zones in the proposed rotary reactor. NO x in the flue gas was adsorbed onto the catalyst surface in the adsorption zone and then reduced by the reducing gas in the reduction zone. The performance of the proposed reaction process was investigated in a simulated rotary reactor. The catalysts used were lab synthesized, Fe and Co co-impregnated over activated semi-coke. The results showed an excellent NO x removal efficiency at 200 and 250℃. However, the NO x reduction efficiencies were always much lower than the removal efficiency. Most of the removed NO x was simply passed from the flue gas to the reducing gas. It is very important to feed great excess CO in the reduction zone, since CO tended to be firstly consumed by residue oxygen in the reduction zone and then be involved in the NO+CO reaction. In an in situ DRIFTs study of the dynamic NO x adsorptionreduction process, it was found that poor reduction and desorption behavior of the store nitrates was the bottleneck of the NO x adsorption-reduction process.

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Section: Co Slippingmentioning

confidence: 99%

Nitrogen oxides reduction by carbon monoxide over semi-coke supported catalysts in a simulated rotary reactor: reaction performance under dry conditions

et al. 2016

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“…Catalytic oxidation of NO plays a decisive role in NO x storage and reduction (NSR) [4][5][6], continuously regenerating trap (CRT) [7] and selective catalytic reduction (SCR) [8][9][10], which are the main technologies for NO x removing. The key of the oxidation is NO to NO 2 , and if the ratio of NO/NO x equals to about 60%, the removal effect will be the optimum [11].…”

Section: Introductionmentioning

confidence: 99%

Solvent effects during the synthesis of Cr/Ce0.2Zr0.8O2 catalysts and their activities in NO oxidation

Cai

Zhong

Ding

et al. 2015

Chemical Engineering Journal

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“…It is generally believed that the introduction of transition metals in AC promotes the oxidation of NO, which is the first step of Langmuir‐Hinshelwood (L‐H) mechanism. The reaction mechanism follows L‐H mechanism: 2 NO + O 2( g ) ( over AC sites ) → 2 NO 2( a ) (R5) NH 3( g ) ( over Lewis acid sites ) → NH 3( a ) (R6) NO 2( a ) + 2 NH 3( a ) → NO 2 ( NH 3 ) 2 (R7) NO 2 ( NH 3 ) 2 + NO → 2 N 2 + 3 H 2 O (R8) …”

Section: Results and Disscussionmentioning

confidence: 99%

Enhancement of the denitrification efficiency over low‐rank activated coke by doping with transition metal oxides

Meng

Cheng

et al. 2020

Can J Chem Eng

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Low-rank activated coke (AC) is widely used for industrial flue gas purification due to its multipollutant cooperative removal capability. To enhance the denitrification capacity of AC for the selective catalytic reduction (SCR) of NO with NH 3 , several transition metal (Fe, Mn, Ce, V) oxides were uniformly loaded into AC by solvent impregnation. Compared to untreated AC, modified AC showed excellent denitrification efficiency above 90%. N 2 adsorptiondesorption and Raman spectroscopy techniques were used to characterize the pore size distribution and crystal structure of AC samples. The introduction of transition metal oxides had little effect on the pore structure of AC but increased the nitrogen-containing functional groups, which facilitated NO removal. Moreover, x-ray photoelectron spectroscopy (XPS) was used to analyze the valence changes of metal elements before and after denitrification.After the reaction, the content increase of the low-valence metal oxides indicated that the transition metal oxides were involved in the reaction of NO with NH 3 . High-valence metal oxides oxidized NO to NO 2 , which reacts more easily with NH 3 , thereby increasing the denitrification efficiency. Importantly, in the presence of SO 2 , modified AC still presented high denitrification performance.This transition metal oxides doping method can effectively improve the ability of low-rank AC to remove NO in multi-contaminant flue gas. K E Y W O R D Sactivated coke, denitrification, flue gas, SCR, transition metal oxides

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In situ DRIFTS investigation on the SCR of NO with NH3 over V2O5 catalyst supported by activated semi-coke

Cited by 151 publications

References 70 publications

Nitrogen oxides reduction by carbon monoxide over semi-coke supported catalysts in a simulated rotary reactor: reaction performance under dry conditions

Nitrogen oxides reduction by carbon monoxide over semi-coke supported catalysts in a simulated rotary reactor: reaction performance under dry conditions

Solvent effects during the synthesis of Cr/Ce0.2Zr0.8O2 catalysts and their activities in NO oxidation

Enhancement of the denitrification efficiency over low‐rank activated coke by doping with transition metal oxides

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