La1−Ce MnO3/attapulgite nanocomposites as catalysts for NO reduction with NH3 at low temperature

Li, Xiazhang; Yin, Yu; Yao, Chao; Zuo, Shixiang; Lu, Xiaowang; Luo, Shiping; Ni, Chaoying

doi:10.1016/j.partic.2016.01.003

Cited by 45 publications

(19 citation statements)

References 30 publications

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“…However, the characteristic peak of the quartz phase at 2θ = 26.8° still exists, indicating that the skeleton structure of Pal remains. The peak at 2θ = 32.4° shifts to a lower Bragg angle because the radius of Mg 2+ (0.072 nm) in the Pal framework is larger than that of Fe 3+ (0.064 nm), and Mg 2+ diffusing into the crystal of PrFeO 3 leads to the expansion of the PrFeO 3 crystal lattice, which also suggests that PrFeO 3 has been successfully immobilized on the surface of Pal. , N-CQDs have a wide characteristic peak at 26° from (002) of graphite. No apparent diffraction peaks from N-CQDs can be identified in the N-CQDs/PrFeO 3 /Pal composites due to low loading and low crystallinity of N-CQDs, which is consistent with the results reported by Shi.…”

Section: Resultsmentioning

confidence: 98%

Palygorskite Immobilized Direct Z-Scheme Nitrogen-Doped Carbon Quantum dots/PrFeO₃ for Photo-SCR Removal of NO_x

Shi

Yan

et al. 2018

ACS Sustainable Chem. Eng.

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Photocatalysis-selective catalytic reduction (photo-SCR) of NO x is recognized as a potential approach for the abatement of nitrogen oxides. However, the development of an efficient photocatalyst for photo-SCR is strongly desired. In the current work, nitrogen-doped carbon quantum dots (N-CQDs)-modified PrFeO3 /palygorskite (Pal) was prepared by a sol–gel/impregnation method. Results indicate that Pal nanorod not only exhibits excellent adsorption performance for gas molecules but also behaves as an ideal support for the immobilization of perovskite particles, leading to enhanced charge separation and visible light absorption facilitated by the formation of Z-scheme heterostructure of N-CQDs/PrFeO3, as revealed by the photoluminescence spectra and Mott–Schottky characterizations. The influence of the mass fraction of N-CQDs relative to PrFeO3 (from 1 to 9 wt %) on the NO x conversion and N2 selectivity was investigated under visible light irradiation. The 5 wt % N-CQDs/PrFeO3/Pal is found to display the highest efficiency of 93% and 100% N2 selectivity favored by abundant acid sites and excellent reducibility, as indicated in NH3-TPD and H2-TPR measurements. Additionally, the tolerance to SO2 and H2O shows no obvious deactivation due to the fact that N-CQDs and Pal can benefit the adsorption of SO2 and H2O and prevent NH3 from being sulfated by SO2 and the catalyst from being eroded by H2O, respectively.

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Section: Resultsmentioning

confidence: 98%

Palygorskite Immobilized Direct Z-Scheme Nitrogen-Doped Carbon Quantum dots/PrFeO₃ for Photo-SCR Removal of NO_x

Shi

Yan

et al. 2018

ACS Sustainable Chem. Eng.

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“…However, to our best knowledge, few studies have been devoted to the investigation of Mn incorporation in perovskite CaTiO 3 on NH 3 -SCR. According to our research in LaMnO 3 , the peaks at around 600 °C should be ascribed to the reduction of Mn 3+ or Mn 2+ to Mn 0 . In other words, much more amount of Mn incorporated in CaTiO 3 means more difficult in the reduction of Mn ion in “B” site to Mn 0…”

Section: Resultsmentioning

confidence: 99%

Conversion of CaTi_1–xMn_xO_3–δ-Based Photocatalyst for Photocatalytic Reduction of NO via Structure-Reforming of Ti-Bearing Blast Furnace Slag

Zhang

Lü

et al. 2019

ACS Sustainable Chem. Eng.

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In this work, a novel low-cost and robust approach is developed to covert Ti-bearing blast furnace slag (Ti-slag) to the main feed stock of photoassisted NH3 selective catalytic reduction (Photo NH3-SCR) of NO with high performance. The CaTi1–x Mn x O3−δ catalyst was directly extracted from the Ti-bearing slag with MnO2 in situ modification and Na2CO3 reformation followed by dilute hydrochloric acid leaching and water washing. Various methods were employed to characterize the structure changes of the slag in the preparation processes of MnO2 in situ doping, Na2CO3 reforming, and leaching. Mn element can be incorporated into the perovskite CaTiO3 with 0.16 to 1.79 wt % depending on the amount of MnO2 added in Ti-slag at 1500 °C. It is interesting to note that the amount of Mn incorporated into the perovskite decreases remarkably with increasing the additional amount of MnO2 in the in situ doped modification, which reaches a maximum of 9.54 wt % for the reformed slag of 5 wt % MnO2 addition. Moreover, most of the Si has been transferred to the sodium aluminum oxide instead of diopside, which is easily removed in the following leaching stage. Further semiquant crystalline analysis shows that there is 99 wt % of perovsvkite CaTi1–x Mn x O3−δ with 1 wt % hexamagnesium manganese(IV) oxide in the slag after leaching with 5 wt % MnO2 addition, and the catalyst shows more than 93% NO removal efficiency at 300 °C in photoassisted NH3-SCR performance. The present study proposes a new route for the high value-added recycling of silicate minerals and wastes via structure-reforming with in situ optimization of secondary resources.

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“…Li et al [34] prepared a series of perovskite La 1−x Ce x MnO 3 (x = 0-0.2) nanocomposites by sol-gel method and studied the effect of a Ce 4+ doping ratio on NO conversion. The results showed that the catalytic activity of active perovskite species was improved by adding the appropriate amount of Ce 4+ to the La 3+ site.…”

Section: Effect Of Dopantsmentioning

confidence: 99%

“…Figure 5 compares the NO decomposition catalytic activity of some LaMO 3 -based perovskite [30][31][32][33][34][35][36][37][38][39][40][41][42][43].…”

Section: Effect Of Dopantsmentioning

confidence: 99%

“…It is ge believed that La 3+ mainly fixes the crystal structure of the catalyst, and the main ca effect is controlled by B-site ions. Yokoi and Uchida [39] studied the reactivity of di B-site cations to NO decomposition directly in LaMO3 (M = Cr, Mn, Fe, Co, and Ni Figure 5 compares the NO decomposition catalytic activity of some LaMO perovskite [30][31][32][33][34][35][36][37][38][39][40][41][42][43]. For BaMnO3-based perovskite oxides, Iwakuni et al [37] studied the effect of d on NO direct decomposition activity.…”

Section: Effect Of Dopantsmentioning

confidence: 99%

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A Review on the Catalytic Decomposition of NO by Perovskite-Type Oxides

Shen

Dong

et al. 2021

Catalysts

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Direct catalytic decomposition of NO has the advantages of being a simple process, producing no secondary pollution, and being good for the economy, which has attracted extensive research in recent years. Perovskite-type mixed oxides, with an ABO3 or A2BO4 structure, are promising materials as catalysts for NO decomposition due to their low cost, high thermal stability, and, of course, their good catalytic performances. In this review, the influence factors, such as A-site substitution, B-site substitution and reaction conditions on the catalytic performance of catalysts have been expounded. The reaction mechanisms of direct NO decomposition are also discussed. Finally, major conclusions are drawn and some research challenges are highlighted.

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La1−Ce MnO3/attapulgite nanocomposites as catalysts for NO reduction with NH3 at low temperature

Cited by 45 publications

References 30 publications

Palygorskite Immobilized Direct Z-Scheme Nitrogen-Doped Carbon Quantum dots/PrFeO₃ for Photo-SCR Removal of NO_x

Palygorskite Immobilized Direct Z-Scheme Nitrogen-Doped Carbon Quantum dots/PrFeO₃ for Photo-SCR Removal of NO_x

Conversion of CaTi_1–xMn_xO_3–δ-Based Photocatalyst for Photocatalytic Reduction of NO via Structure-Reforming of Ti-Bearing Blast Furnace Slag

A Review on the Catalytic Decomposition of NO by Perovskite-Type Oxides

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La1−Ce MnO3/attapulgite nanocomposites as catalysts for NO reduction with NH3 at low temperature

Cited by 45 publications

References 30 publications

Palygorskite Immobilized Direct Z-Scheme Nitrogen-Doped Carbon Quantum dots/PrFeO3 for Photo-SCR Removal of NOx

Palygorskite Immobilized Direct Z-Scheme Nitrogen-Doped Carbon Quantum dots/PrFeO3 for Photo-SCR Removal of NOx

Conversion of CaTi1–xMnxO3–δ-Based Photocatalyst for Photocatalytic Reduction of NO via Structure-Reforming of Ti-Bearing Blast Furnace Slag

A Review on the Catalytic Decomposition of NO by Perovskite-Type Oxides

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Palygorskite Immobilized Direct Z-Scheme Nitrogen-Doped Carbon Quantum dots/PrFeO₃ for Photo-SCR Removal of NO_x

Palygorskite Immobilized Direct Z-Scheme Nitrogen-Doped Carbon Quantum dots/PrFeO₃ for Photo-SCR Removal of NO_x

Conversion of CaTi_1–xMn_xO_3–δ-Based Photocatalyst for Photocatalytic Reduction of NO via Structure-Reforming of Ti-Bearing Blast Furnace Slag