Effect of metal ions doping (M = Ti4+, Sn4+) on the catalytic performance of MnO /CeO2 catalyst for low temperature selective catalytic reduction of NO with NH3

Xiong, Yan; Tang, Changjin; Yao, Xin‐Kan; Zhang, Lei; Li, Lulu; Wang, Xiaobo; Deng, Yu; Gao, Fei

doi:10.1016/j.apcata.2015.01.038

Cited by 197 publications

(104 citation statements)

References 50 publications

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“…Additionally, the broad peak at 3260 cm −1 was attributed to the N-H stretching vibration of the NH 4+ group [49]. Combining the TG-DTA result with the FT-IR result, the conclusion further confirms that the formation of sulfate species on the surface of the catalyst during the SCR reaction in the presence of SO2 can lead to pore plugging, a decrease in the surface area, and occupation of the active sites, which explain the decline in the SCR activity of the catalyst [18].…”

Section: Ft-ir Analysissupporting

confidence: 63%

“…In addition, the beginning Figure 5 shows the N 2 adsorption-desorption isotherms and pore size distribution of the fresh and poisoned catalysts, in which the isotherms are classical type IV [24]. The H2-type hysteresis loop was observed, which is typical for a wormhole-like mesostructure [18]. In addition, the beginning and end of the adsorption volume shifted in the direction of a large p/p 0 , which shows that there was some smaller pore clogging of the catalyst after poisoning by SO 2 .…”

Section: Bet Sem-eds Mappingmentioning

confidence: 99%

“…The concentration of Ce 3+ was used to evaluate the number of formed oxygen vacancies. The oxygen vacancies were driven by the transition fromCe 4+ to Ce 3+ , which accelerated the transport of active oxygen species [18] and facilitated the reaction. The ratio of Ce 3+ /(Ce 3+ +Ce 4+ ) over the used sample(12.7%) was slightly greater than that of the fresh sample (11.6%) ( Table 1), due to the following reaction [34,35]: 2CeO 2 + 3SO 2 + O 2 →Ce 2 (SO 4 ) 3 .…”

Section: Xpsmentioning

confidence: 99%

“…Researchers have also developed various Mn-based catalysts, such as MnO x /Al 2 O 3 [15], MnO x /TiO 2 [16,17] andMn-Ce-SnO 2 [18]. In addition, small concentrations of SO 2 remain in the flue gases after the desulfurizer, thus requiring consideration of the effect of SO 2 on activity.…”

Section: Introductionmentioning

confidence: 99%

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Poisoning Effect of SO2 on Honeycomb Cordierite-Based Mn–Ce/Al2O3Catalysts for NO Reduction with NH3 at Low Temperature

et al. 2018

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Honeycomb cordierite-based Mn-Ce/Al 2 O 3 catalysts were prepared by the impregnation method and used for low-temperature selective catalytic reduction (SCR) of NO x with NH 3 , with and without SO 2 and/or H 2 O in a homemade fixed-bed tubular reactor. The catalyst reached nearly 80% NO x conversion at 100 • C in the absence of SO 2 . However, SO 2 reduces the catalytic activity (80% to 72%) of the honeycomb cordierite-based Mn-Ce/Al 2 O 3 catalysts under identical conditions. This finding demonstrated that the catalyst exhibited high activity at low temperature and excellent SO 2 resistance in the presence of 50 ppm SO 2 . The fresh and sulfated honeycomb cordierite-based Mn-Ce/Al 2 O 3 catalysts were characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), N 2 adsorption-desorption, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), thermogravimetry and differential thermal analysis (TG-DTA), and Fourier transform infrared (FT-IR) spectroscopy. Characterization results indicated that the deactivation by SO 2 was primarily the result of the deposition of ammonium hydrogen sulfate and sulfated CeO 2 on the catalyst surface during the SCR process. The formed sulfates depressed the catalytic activity via the blocking of pores and the occupation of active sites. Additionally, the competitive adsorption between SO 2 and NH 3 always decreased the catalytic activity.

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Section: Ft-ir Analysissupporting

confidence: 63%

Section: Bet Sem-eds Mappingmentioning

confidence: 99%

Section: Xpsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Poisoning Effect of SO2 on Honeycomb Cordierite-Based Mn–Ce/Al2O3Catalysts for NO Reduction with NH3 at Low Temperature

et al. 2018

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“…Moreover, the peak area in the profile of MnAl-LDO (FNP) catalyst was larger than that in the profile of MnAl-LDO (CP) catalyst. The enhancement was mainly due to the synergistic effect between the Mn and Al, which can create oxygen defects and oxygen vacancies, which suggested that the mobility of surface oxygen was enhanced and beneficial to the SCR reaction [44]. Meanwhile, the strong reduction performance of MnAl-LDO (FNP) catalyst offered richer active sites on the surface.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Oxygen Vacancies in a Two-Dimensional MnAl-Layered Double Oxide Prepared via Flash Nanoprecipitation Offers High Selective Catalytic Reduction of NOx with NH3

Zhao

Wang

et al. 2018

Nanomaterials

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A two-dimensional MnAl-layered double oxide (LDO) was obtained by flash nanoprecipitation method (FNP) and used for the selective catalytic reduction of NOx with NH3. The MnAl-LDO (FNP) catalyst formed a particle size of 114.9 nm. Further characterization exhibited rich oxygen vacancies and strong redox property to promote the catalytic activity at low temperature. The MnAl-LDO (FNP) catalyst performed excellent NO conversion above 80% at the temperature range of 100–400 °C, and N2 selectivity above 90% below 200 °C, with a gas hourly space velocity (GHSV) of 60,000 h−1, and a NO concentration of 500 ppm. The maximum NO conversion is 100% at 200 °C; when the temperature in 150–250 °C, the NO conversion can also reach 95%. The remarkable low-temperature catalytic performance of the MnAl-LDO (FNP) catalyst presented potential applications for controlling NO emissions on the account of the presentation of oxygen vacancies.

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Nanoscale Precursor Distribution by Microfluidization for Scalable Production of Highly Efficient Thermocatalysts

Kim,

Lee,

Kim

et al. 2024

Adv Funct Materials

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The preparation of two‐dimensional (2D) materials often requires complicated exfoliation procedures having low yields. The exfoliated nanosheets are prone to thermal aggregation and unsuitable for thermocatalysis. Herein, a scalable approach produces 2D catalyst precursors well‐distributed and mixed at the nanoscale. Using continuous microfluidization and single‐layer layered double hydroxide (LDH) synthesis, the prepared suspension contained exfoliated hexagonal boron nitride (h‐BN) nanosheets and single‐layer LDHs. The increased contact area between h‐BN and LDHs enables the formation of highly dispersed MnCoAl mixed metal oxide nanoparticles anchored on h‐BN nanosheets after calcination. In the selective catalytic reduction of NOx with NH3 (NH3‐SCR, a representative thermocatalytic application), this nanocomposite demonstrates a record turnover frequency of 0.772 h−1 among reported Mn‐based NH3‐SCR catalysts, with high NOx conversion and high N2 selectivity at low temperatures. By creating 2D precursors mixed at the nanoscale, this new synthetic approach can realize the scalable production of highly efficient thermocatalysts.

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Effect of metal ions doping (M = Ti4+, Sn4+) on the catalytic performance of MnO /CeO2 catalyst for low temperature selective catalytic reduction of NO with NH3

Cited by 197 publications

References 50 publications

Poisoning Effect of SO2 on Honeycomb Cordierite-Based Mn–Ce/Al2O3Catalysts for NO Reduction with NH3 at Low Temperature

Poisoning Effect of SO2 on Honeycomb Cordierite-Based Mn–Ce/Al2O3Catalysts for NO Reduction with NH3 at Low Temperature

Enhanced Oxygen Vacancies in a Two-Dimensional MnAl-Layered Double Oxide Prepared via Flash Nanoprecipitation Offers High Selective Catalytic Reduction of NOx with NH3

Nanoscale Precursor Distribution by Microfluidization for Scalable Production of Highly Efficient Thermocatalysts

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