Redistributing Cu species in Cu-SSZ-13 zeolite as NH3-SCR catalyst via a simple ion-exchange

Liu, Ben; Lv, Nangui; Wang, Chan; Zhang, Hongwei; Yue, Yuanyuan; Xu, Jiaming; Bi, Xiaotao; Bao, Xiaojun

doi:10.1016/j.cjche.2021.10.027

Cited by 23 publications

(9 citation statements)

References 58 publications

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“…Concerning the copper content in the two materials, the average value obtained was approximately 2 wt.%, indicating the correct incorporation of the element in mass percentage in relation to the starting value of the precursor gel previously calculated. [21,41,45,46]. In addition, the particle size presented a uniform value between 3 and 4 nm in the two investigated samples.…”

Section: Characterizationmentioning

confidence: 77%

“…In order to study and better understand the dispersion and distribution of copper in the sample, HR-TEM images and EDX mapping were recorded and are displayed in Figure 3. In all samples, the typical shape of chabazite-type zeolites was observed with a slight difference between 2Cu-SAPO-34 (Figure 3a) and 2Cu-SSZ-13 (Figure 3b) [21,41,45,46]. In addition, the particle size presented a uniform value between 3 and 4 nm in the two investigated samples.…”

Section: Characterizationmentioning

confidence: 79%

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Comparison of Cu-CHA-Zeolites in the Hybrid NSR-SCR Catalytic System for NOx Abatement in Mobile Sources

et al. 2023

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DeNOx activity in a NSR–SCR hybrid system of two copper-containing chabazite-type zeolitic catalysts was addressed. A Pt-Ba-K/Al2O3 model catalyst was used as the NSR (NOx storage and reduction) catalyst. For the SCR (selective catalytic reduction) system, two Cu-CHA zeolites were synthesized employing a single hydrothermal synthesis method assisted with ultrasound and incorporating Cu in a 2 wt.%, 2Cu-SAPO-34 and 2Cu-SSZ-13. The prepared catalysts were characterized, and the crystallinity, surface area, pore size, HR-TEM and EDX mapping, coordination of Cu ions and acidity were compared. The NH3 storage capacity of the SCR catalysts was 1890 and 837 μmol NH3·gcat−1 for 2Cu-SAPO-34 and 2Cu-SSZ-13, respectively. DeNOx activity was evaluated for the single NSR system and the double-bed NSR–SCR by employing alternating lean (3%O2) and rich (1%H2) cycles, maintaining a concentration of 600 ppm NO, 1.5% H2O and 0.3% CO2 between 200 and 350 °C. The addition of the SCR system downstream of the NSR catalyst significantly improved NOx conversion mainly at low temperature, maintaining the selectivity to N2 above 80% and reaching values above 90% at 250 °C when the 2Cu-SSZ-13 catalyst was located. The total reduction in the production of NH3 and ~2% of N2O was observed when comparing the NSR–SCR configuration with the single NSR catalyst.

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Section: Characterizationmentioning

confidence: 77%

Section: Characterizationmentioning

confidence: 79%

Comparison of Cu-CHA-Zeolites in the Hybrid NSR-SCR Catalytic System for NOx Abatement in Mobile Sources

et al. 2023

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“…This post-treatment procedure removed a part of Cu 2+ ions, and simultaneously relocalized the reserved ones from the large cages to 6 MR sites to prevent the formation of bulk CuO, which enhanced the SCR activity and the hydrothermal stability of the Cu-SSZ-13 catalyst. The post-treatment with HNO 3 ( Xie et al, 2015 ; Jiang H. et al, 2020 ; Liu B. et al, 2022 ) and HNO 3 -NH 4 NO 3 ( Shan et al, 2020 ) could also optimize the Cu species distribution and avoid the aggregation of isolated Cu 2+ ions into CuO x clusters to achieve a wide active temperature window, high hydrothermal stability, and enhanced anti-poisoning performance of Cu-SSZ-13 catalyst. Moreover, the post-treatment with ammonium hexafluorosilicate (AHFS) guaranteed the improved hydrothermal stability of Cu-SSZ-13 catalyst due to the inhibition of dealumination and structural collapse and the formation of Si(OSi) 3 (OAl) and Si(OSi) 4 structures with better hydrothermal stability ( Zhang et al, 2015 ).…”

Section: Modifying the Cu Active Sitesmentioning

confidence: 99%

Recent progress in performance optimization of Cu-SSZ-13 catalyst for selective catalytic reduction of NOx

Xin

Zhang

et al. 2022

Front. Chem.

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Nitrogen oxides (NOx), which are the major gaseous pollutants emitted by mobile sources, especially diesel engines, contribute to many environmental issues and harm human health. Selective catalytic reduction of NOx with NH3 (NH3-SCR) is proved to be one of the most efficient techniques for reducing NOx emission. Recently, Cu-SSZ-13 catalyst has been recognized as a promising candidate for NH3-SCR catalyst for reducing diesel engine NOx emissions due to its wide active temperature window and excellent hydrothermal stability. Despite being commercialized as an advanced selective catalytic reduction catalyst, Cu-SSZ-13 catalyst still confronts the challenges of low-temperature activity and hydrothermal aging to meet the increasing demands on catalytic performance and lifetime. Therefore, numerous studies have been dedicated to the improvement of NH3-SCR performance for Cu-SSZ-13 catalyst. In this review, the recent progress in NH3-SCR performance optimization of Cu-SSZ-13 catalysts is summarized following three aspects: 1) modifying the Cu active sites; 2) introducing the heteroatoms or metal oxides; 3) regulating the morphology. Meanwhile, future perspectives and opportunities of Cu-SSZ-13 catalysts in reducing diesel engine NOx emissions are discussed.

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“…[1][2][3][4] Nowadays, selective catalytic reduction with NH 3 (NH 3 -SCR) has been proven to be the most effective technology. [5][6][7][8] Catalysts plays a key role in the practical application of NH 3 -SCR. In recent years, iron oxide catalysts have received much attention due to their environmentally benign character, good thermal stability and their excellent NH 3 -SCR activity and N 2 selectivity at medium or high temperatures.…”

Section: Introductionmentioning

confidence: 99%

“…Nitrogen oxides (NO x ) have given rise to a variety of increasingly harmful impacts on the environment [1–4] . Nowadays, selective catalytic reduction with NH 3 (NH 3 ‐SCR) has been proven to be the most effective technology [5–8] . Catalysts plays a key role in the practical application of NH 3 ‐SCR.…”

Section: Introductionmentioning

confidence: 99%

Low‐Temperature NH₃ Selective Catalytic Reduction Performance Enhancement of Fe‐Based Oxides by Employing Carbon Nanotubes to Decorate the MgFe‐LDH

Liu

et al. 2023

ChemistrySelect

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In this study, a series of Mg3Fe1‐layered double oxide/xcarbon nanotubes (Mg3Fe1‐LDO/xCNTs) catalysts were constructed from the topological shift of Mg3Fe1‐layered double hydroxide (Mg3Fe1‐LDH) precursor. The as‐prepared catalysts were innovatively evaluated as potential candidates for low temperature selective catalytic reduction of NO with NH3 (NH3‐SCR). It was found that Mg3Fe1/10CNTs catalyst exhibited superb NH3‐SCR activity, with NOx conversion exceeding 80 % at low temperatures (180–270 °C). Moreover, excellent durability and stability towards SO2 was obtained. Such high catalytic efficiency can be attributed to the proper surface acidity and redox capacity of the catalyst, which might be correlated with higher dispersion and more appropriate valence distribution of Fe species caused by the moderate CNTs doping content. This work provides a fundamental understanding on Fe3+/Fe2+ synergistic effect of NH3‐SCR, which is propitious for the rational design and optimization of Fe‐based oxide low‐temperature denitrification (de‐NOx) catalysts.

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Redistributing Cu species in Cu-SSZ-13 zeolite as NH3-SCR catalyst via a simple ion-exchange

Cited by 23 publications

References 58 publications

Comparison of Cu-CHA-Zeolites in the Hybrid NSR-SCR Catalytic System for NOx Abatement in Mobile Sources

Comparison of Cu-CHA-Zeolites in the Hybrid NSR-SCR Catalytic System for NOx Abatement in Mobile Sources

Recent progress in performance optimization of Cu-SSZ-13 catalyst for selective catalytic reduction of NOx

Low‐Temperature NH₃ Selective Catalytic Reduction Performance Enhancement of Fe‐Based Oxides by Employing Carbon Nanotubes to Decorate the MgFe‐LDH

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Redistributing Cu species in Cu-SSZ-13 zeolite as NH3-SCR catalyst via a simple ion-exchange

Cited by 23 publications

References 58 publications

Comparison of Cu-CHA-Zeolites in the Hybrid NSR-SCR Catalytic System for NOx Abatement in Mobile Sources

Comparison of Cu-CHA-Zeolites in the Hybrid NSR-SCR Catalytic System for NOx Abatement in Mobile Sources

Recent progress in performance optimization of Cu-SSZ-13 catalyst for selective catalytic reduction of NOx

Low‐Temperature NH3 Selective Catalytic Reduction Performance Enhancement of Fe‐Based Oxides by Employing Carbon Nanotubes to Decorate the MgFe‐LDH

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Product

Resources

About

Low‐Temperature NH₃ Selective Catalytic Reduction Performance Enhancement of Fe‐Based Oxides by Employing Carbon Nanotubes to Decorate the MgFe‐LDH