Influence of textures, oxygen-containing functional groups and metal species on SO 2 and NO removal over Ce-Mn/NAC

Fang, Ningjie; Guo, Juan; Song, Shaoxian; Li, Jianjun; Chu, Ying‐Hao

doi:10.1016/j.fuel.2017.04.035

Cited by 47 publications

(20 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The specific surface area ( S BET ) of AC and modified AC are not significantly different. However, the S BET of the modified AC was significantly reduced by acid modification in several other studies . In this work, the modified AC has a low metal content and the pre‐treatment conditions are mild so that the pore structure of the AC is not significantly destroyed.…”

Section: Results and Disscussionmentioning

confidence: 74%

“…The removal of NO needs to be first adsorbed by AC and later reacted with NH 3 , and the introduction of transition metals can promote the adsorption of NO . The Ce exhibited the best denitrification activity, while V showed the lowest activity, since Ce has highest catalytic activity at the low temperature of 150°C and the optimum reaction temperature of V‐loaded AC is 220°C or higher …”

Section: Results and Disscussionmentioning

confidence: 99%

“…At the same time, nitrogen‐containing groups (pyridine and pyrrole) on the AC surface as a catalyst can promote the selective catalytic reduction (SCR) of NO with NH 3 . However, compared with commercial V 2 O 5 /TiO 2 catalysts with a denitrification efficiency above 90%, activated coke still needs further improvement, as the denitrification efficiency is currently only 40% to 70% …”

Section: Introductionmentioning

confidence: 99%

“…A variety of modification methods are used to improve the denitrification performance of AC . The simplest and most commonly used method is to treat AC with nitric acid .…”

Section: Introductionmentioning

confidence: 99%

“…The oxides of transition metals, such as V, Mn, Fe, Cr, and Ni, impregnated on AC can efficiently promote the removal of NO . The transition metal oxides can highly disperse onto an inert carrier to remove NO as active components and play a dominant role in NO oxidation . Fe and V usually adapt to a reaction temperature higher than 200°C, while Ce and Mn have adequate activity at lower temperatures.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

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

View full text Add to dashboard Cite

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

show abstract

Section: Results and Disscussionmentioning

confidence: 74%

Section: Results and Disscussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…A variety of modification methods are used to improve the denitrification performance of AC . The simplest and most commonly used method is to treat AC with nitric acid .…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations