Ni-Ce-Ti as a superior catalyst for the selective catalytic reduction of NOx with NH3

Liu, Zhiming; Liu, Haiyan; Feng, Xu; Ma, Lingling; Cao, Xingzhong; Wang, Boyu

doi:10.1016/j.mcat.2017.11.028

Cited by 83 publications

(46 citation statements)

References 51 publications

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“…[32] Meanwhile, extra diffraction peaks can also be observed, such as anatase TiO 2 detected at 500°C, rutile TiO 2 and NiTiO 3 found at 600°C. [43] As reported, the formation of rutile TiO 2 were harmful to NH 3 -SCR in consistent with the observed catalytic activities in Figure 3. [44] Moreover, the average crystallite sizes of catalysts were gradually increased ( Table 2), which were calculated by using the reflections at 2θ value of 43°for the (012) crystal face of NiO in XRD based on the Scherrer equation.…”

Section: Characterization Of Ni 4-x Mn X Ti 1 -Ldhssupporting

confidence: 90%

NOx Removal Performance Optimization of NiMnTi Mixed Oxide Catalysts by Tuning the Redox Capability

et al. 2019

ChemCatChem

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A series of Ni4‐xMnxTi1Oy mixed metal oxides (Ni4‐xMnxTi1‐LDO) catalysts originated from layered double hydroxides (LDHs) were fabricated and evaluated in the selective catalytic reduction of NO with NH3 (NH3‐SCR). To optimize the denitrification performance, the redox capability of catalysts was adjusted by calcining the Ni4‐xMnxTi1‐LDHs precursors with different Mn loading at different temperatures. The results revealed that calcination temperature was the secondary factor while the molar ratio of Mn to Ni was the main factor for influencing the redox properties. Among Ni4‐xMnxTi1‐LDO catalysts, the Ni2Mn2Ti1‐LDO catalyst afforded the optimal DeNOx behavior with above 90 % NOx conversion and 95 % selectivity of N2 as well as superior SO2 resistance in the wide temperature region of 150–360 °C. Multiple characterizations indicated that exceptional catalytic performance of Ni2Mn2Ti1‐LDO catalyst was highly dependent on the suitable redox capability resulted from moderate concentration of Ni3+, Mn4+ and chemisorbed oxygen Oβ in catalysts surface.

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Section: Characterization Of Ni 4-x Mn X Ti 1 -Ldhssupporting

confidence: 90%

NOx Removal Performance Optimization of NiMnTi Mixed Oxide Catalysts by Tuning the Redox Capability

et al. 2019

ChemCatChem

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“…In order to exhibit the reaction mechanism, in situ DRIFTS experiments were performed. [62,63] Thus both of Lewis acid sites and Brønsted acid sites were existed on the MnÀ EuÀ Fe(1)-500 catalyst, which was in accordance with the NH 3 -TPD results. As shown in Figure 14, after the adsorption of NH 3 for 30 min, the peaks of 3349, 3234, 3140, 1596, 1445, 1260 and 1174 cm À 1 emerged.…”

Section: Xpssupporting

confidence: 85%

Improved Low‐Temperature Activity and H₂O Resistance of Fe‐Doped Mn−Eu Catalysts for NO Removal by NH₃−SCR

et al. 2019

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Novel MnÀ EuÀ Fe catalysts were prepared via co-precipitation method for NO x removal by selective catalytic reduction with NH 3 (NH 3 À SCR). The MnÀ EuÀ Fe(1)-500 catalyst possessed the highest level of low-temperature activity, giving 98 % NO conversion at 100°C. This catalyst also exhibited excellent H 2 O resistance capacity, even at a high gas hourly space velocity (GHSV) of 75,000 h À 1 . The NO conversion still maintained at approximately 90 % in the presence of 15 % H 2 O at 230°C after 50 h, and the adverse effects of H 2 O could be quickly eliminated after the removal of H 2 O. Detailed characterization and analysis indicated that strong interactions among Mn, Eu and Fe resulted in the excellent low-temperature SCR activity and H 2 O resistance of the MnÀ EuÀ Fe(1)-500 catalyst. The strong interactions lead to larger specific surface area, higher concentrations of Mn 4 + , Fe 3 + and O α ; improved redox properties, increased acid sites and acid strength, and more adsorption amounts of NO/NH 3 in the presence of H 2 O. The MnÀ EuÀ Fe(1)-500 catalyst is a potential future catalyst for low-temperature NO x removal derived from high-H 2 O-content flue gases of natural gas combustion.

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“…Especially, nickel species possess abundant surface Up to now, a lot of reports have found that introducing other active ingredients (e.g., titanium oxides [12], manganese oxides [13], or tungsten oxides [2]) is an effective way to promote the denitration (DeNOx) performance of iron-based catalysts. Especially, nickel species possess abundant surface acidity sites [14] and a favorable ability to increase the N2 selectivity of NH3-SCR reactions [15,16], which was expected to be introduced into the iron-based catalytic system [17]. Furthermore, nickel oxides are considered as valuable materials to induce a synergistic effect with other active species, such as NiMnOx [18,19] and NiTiOx [20], which are very sensitive to the synthesis process.…”

Section: Introductionmentioning

confidence: 99%

NOx Removal by Selective Catalytic Reduction with Ammonia over a Hydrotalcite-Derived NiFe Mixed Oxide

Wang

Zou

et al. 2018

Catalysts

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A series of NiFe mixed oxide catalysts were prepared via calcining hydrotalcite-like precursors for the selective catalytic reduction of nitrogen oxides (NOx) with NH3 (NH3-SCR). Multiple characterizations revealed that catalytic performance was highly dependent on the phase composition, which was vulnerable to the calcination temperature. The MOx phase (M = Ni or Fe) formed at a lower calcination temperature would induce more favorable contents of Fe2+ and Ni3+ and as a result contribute to the better redox capacity and low-temperature activity. In comparison, NiFe2O4 phase emerged at a higher calcination temperature, which was expected to generate more Fe species on the surface and lead to a stable structure, better high-temperature activity, preferable SO2 resistance, and catalytic stability. The optimum NiFe-500 catalyst incorporated the above virtues and afforded excellent denitration (DeNOx) activity (over 85% NOx conversion with nearly 98% N2 selectivity in the region of 210–360 °C), superior SO2 resistance, and catalytic stability.

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Ni-Ce-Ti as a superior catalyst for the selective catalytic reduction of NOx with NH3

Cited by 83 publications

References 51 publications

NOx Removal Performance Optimization of NiMnTi Mixed Oxide Catalysts by Tuning the Redox Capability

NOx Removal Performance Optimization of NiMnTi Mixed Oxide Catalysts by Tuning the Redox Capability

Improved Low‐Temperature Activity and H₂O Resistance of Fe‐Doped Mn−Eu Catalysts for NO Removal by NH₃−SCR

NOx Removal by Selective Catalytic Reduction with Ammonia over a Hydrotalcite-Derived NiFe Mixed Oxide

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Ni-Ce-Ti as a superior catalyst for the selective catalytic reduction of NOx with NH3

Cited by 83 publications

References 51 publications

NOx Removal Performance Optimization of NiMnTi Mixed Oxide Catalysts by Tuning the Redox Capability

NOx Removal Performance Optimization of NiMnTi Mixed Oxide Catalysts by Tuning the Redox Capability

Improved Low‐Temperature Activity and H2O Resistance of Fe‐Doped Mn−Eu Catalysts for NO Removal by NH3−SCR

NOx Removal by Selective Catalytic Reduction with Ammonia over a Hydrotalcite-Derived NiFe Mixed Oxide

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Improved Low‐Temperature Activity and H₂O Resistance of Fe‐Doped Mn−Eu Catalysts for NO Removal by NH₃−SCR