Synergistic removal of NO and N 2 O in low-temperature SCR process with MnO x /Ti based catalyst doped with Ce and V

Niu, Yanqing; Shang, Tong; Suo, Hui; Zhang, Xiaolu; Yu, Lei; Yuan, Liang; Wang, Shui

doi:10.1016/j.fuel.2016.07.122

Cited by 71 publications

(37 citation statements)

References 27 publications

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“…The prepared catalysts were exposed to the gas mixture of 2% NH 3 /N 2 for 20 min and their FT-IR spectra were obtained (Fig. 7) 19,35 In addition, the peaks at 2363 and 2333 cm À1 are assigned to the anti-symmetric stretching vibration of CO 2 , which was adsorbed from the air.…”

Section: Ft-ir Analysismentioning

confidence: 99%

High N₂ selectivity in selective catalytic reduction of NO with NH₃ over Mn/Ti–Zr catalysts

Zhang

Liu

et al. 2018

RSC Adv.

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Section: Ft-ir Analysismentioning

confidence: 99%

High N₂ selectivity in selective catalytic reduction of NO with NH₃ over Mn/Ti–Zr catalysts

Zhang

Liu

et al. 2018

RSC Adv.

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“…Nitrogen oxide (NO x ) emissions from stationary combustion systems, such as coal‐fired power plants, waste incinerators, and industrial ovens, have become a global concern. To reduce NO x emissions during coal combustion, various NO x reduction technologies, including low‐NO x combustion methods such as air staging combustion, fuel staging combustion, and flue gas recirculation (FGR), as well as NO x removal methods, such as selective catalytic reduction (SCR) and selective non‐catalytic reduction (SNCR), have been widely adopted in both commercial and industrial power plants. A schematic of the combined SCR and low‐NO x combustion methods is illustrated in Figure .…”

Section: Introductionmentioning

confidence: 99%

“…However, considering the limited reduction efficiency of low‐NO x combustion methods, where NOx emissions are above 400 mg · m −3 , and restrictions on NO x emissions (100 mg · m −3 in the newly‐released air pollutant emission standards for thermal power plants in China, GB 13223‐2011), SCR of NO x to N 2 using NH 3 as a reductant is considered to be the most effective treatment of stack gas from stationary combustion systems (even though the catalyst and reductant are high‐cost). The reaction is expressed as R1:

4 N O + 4 N {normalH}_{3} + {normalO}_{2} \overset{C a t a l y s t}{\to} 4 {normalN}_{2} + 6 {normalH}_{2} O

…”

Section: Introductionmentioning

confidence: 99%

“…It is necessary to reheat the flue gas to the SCR operating temperature when using traditional V 2 O 5 /TiO 2 catalysts, rendering operation very expensive. Thus, more efforts have focused on low‐temperature catalysts, such as TiO 2 ‐supported catalysts doped with oxides of manganese, cerium, cobalt, and iron …”

Section: Introductionmentioning

confidence: 99%

“…Currently, MnO x /Ti‐based catalysts have been recommended as effective low‐temperature SCR catalysts . Compared to V, Cr, Mn, Fe, Co, Ni, and Cu oxides, Mn supported on anatase TiO 2 performed the best at temperatures as low as 373 K during low‐temperature SCR of NO with NH 3 .…”

Section: Introductionmentioning

confidence: 99%

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Performance of Low‐temperature SCR of NO with NH₃ over MnOx/Ti‐based catalysts

Niu

Zhang

et al. 2019

Can J Chem Eng

Self Cite

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The effects of Mn loadings and precursors, catalyst preparation methods, incineration durations and temperatures, and the addition of Co and Ce on NO-reduction efficiency and selectivity (N 2 O formation) during the preparation of MnOx/Ti-based catalysts were studied by micropore-size analysis (XRD, XPS, SEM, and FTIR), while considering changeable parameters. Meanwhile, the performance of low-temperature SCR of NO with NH 3 over the designed catalysts was tested under various gas hourly space velocities (GHSVs), NH 3 /NO molar ratios, and contents of NO, NH 3 , O 2 , H 2 O, and SO 2 in a lab-scale reactor. Overall, the Mn(0.3)Ce(0.1)/Ti catalyst, which had high NO-reduction efficiency and selectivity (low N 2 O formation), was recommended, with the following preparation methods: ultrasonic impregnation; manganese acetate precursor; and incineration at 500 8C. Appropriate textural properties (high surface area and small pore and crystallite sizes), well-dispersed amorphous manganese (rather than crystalline) on the anatase surface (rather than rutile), abundant active sites, and long residence time are essential for high NO-reduction efficiency. In practice, NO-reduction efficiency decreased with increasing GHSV and the NH 3 and NO contents; however, it initially increased and then became saturated with an increasing NH 3 /NO molar ratio and O 2 content. Water deactivated the catalyst to a recoverable state, whereas SO 2 resulted in unrecoverable deactivation.

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Low‐Temperature De‐NO_x Extruded Monolithic Catalysts Based on Highly Dispersive Mn–Ce Oxide Nanoparticles of Low Ce Content

Jeong

Lee

et al. 2018

Adv Materials Technologies

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A facile strategy to produce low‐temperature De‐NOx extruded monolithic catalysts based on the highly dispersive Mn–Ce oxide nanoparticles of low Ce content is described. The design of the materials is based on dual supports composed of reduced graphene oxide and TiO2, which is made by Mn–Ce oxide nanoparticles well separated on the supports without any agglomeration. Compared to the catalysts with only TiO2 support, the specific surface area of the catalysts is significantly increased by 2.8 times. The temperature‐programmed desorption analysis of NH3 shows that the number of Lewis acid sites increases; thus, the binding strength of the NH3 at the surface of the oxides is also increased. Through the temperature‐programmed reduction of the H2, the rate of the reduction reaction also increases. Thus, the efficiency of the overall De‐NOx reaction increases to 90% with a lower Ce content of 40% at 250 °C and shows good stability at a high temperature of 300 °C. By using the above‐mentioned catalysts, a honeycomb‐type extruded monolithic product with De‐NOx efficiency higher than 90% in the temperature range between 200 and 300 °C is made without any additional binders. This indicates a good formability, enough for the fabrication of the commercialized products.

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Synergistic removal of NO and N 2 O in low-temperature SCR process with MnO x /Ti based catalyst doped with Ce and V

Cited by 71 publications

References 27 publications

High N₂ selectivity in selective catalytic reduction of NO with NH₃ over Mn/Ti–Zr catalysts

High N₂ selectivity in selective catalytic reduction of NO with NH₃ over Mn/Ti–Zr catalysts

Performance of Low‐temperature SCR of NO with NH₃ over MnOx/Ti‐based catalysts

Low‐Temperature De‐NO_x Extruded Monolithic Catalysts Based on Highly Dispersive Mn–Ce Oxide Nanoparticles of Low Ce Content

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Synergistic removal of NO and N 2 O in low-temperature SCR process with MnO x /Ti based catalyst doped with Ce and V

Cited by 71 publications

References 27 publications

High N2 selectivity in selective catalytic reduction of NO with NH3 over Mn/Ti–Zr catalysts

High N2 selectivity in selective catalytic reduction of NO with NH3 over Mn/Ti–Zr catalysts

Performance of Low‐temperature SCR of NO with NH3 over MnOx/Ti‐based catalysts

Low‐Temperature De‐NOx Extruded Monolithic Catalysts Based on Highly Dispersive Mn–Ce Oxide Nanoparticles of Low Ce Content

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High N₂ selectivity in selective catalytic reduction of NO with NH₃ over Mn/Ti–Zr catalysts

High N₂ selectivity in selective catalytic reduction of NO with NH₃ over Mn/Ti–Zr catalysts

Performance of Low‐temperature SCR of NO with NH₃ over MnOx/Ti‐based catalysts

Low‐Temperature De‐NO_x Extruded Monolithic Catalysts Based on Highly Dispersive Mn–Ce Oxide Nanoparticles of Low Ce Content