Enhancement of high-temperature selectivity on Cu-SSZ-13 towards NH3-SCR reaction from highly dispersed ZrO2

Peng, Bo; Rappé, Kenneth G.; Cui, Yue; Gao, Feng; Szanyi, János; Olszta, Matthew J.; Walter, Éric; Wang, Yong; Holladay, Jamie D.; Goffe, Randal A.

doi:10.1016/j.apcatb.2019.118359

Cited by 54 publications

(22 citation statements)

References 28 publications

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“…Over the past years, various novel catalysts for NOx reduction were described in the literature. Among them, zirconia-supported catalysts were found attractive due to the high thermal stability, high low-temperature activity and durability, as well as enhanced resistance to SO 2 and H 2 O [16][17][18][19][20][21]. Cu/ZrO 2 and Cu/ZrO 2 (SO 4 2− ) were found very promising in selective catalytic reduction by n-decane [22][23][24] or propene [25], and finally in NH 3 -SCR [26,27].…”

Section: Introductionmentioning

confidence: 99%

Novel Preparation of Cu and Fe Zirconia Supported Catalysts for Selective Catalytic Reduction of NO with NH3

Świrk

Wang

et al. 2021

Catalysts

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Copper and iron promoted ZrO2 catalysts were prepared by one-pot synthesis using urea. The studied catalysts were characterized by XRD, N2 physisorption, XPS, NH3-TPD, and tested in the selective catalytic reduction of NO with NH3 (NH3-SCR) in the absence and presence of water vapor under the experimental conditions representative of exhaust gases from stationary sources. The influence of SO2 on catalytic performance was also investigated. Among the studied catalysts, the Fe-Zr sample showed the most promising results in NH3-SCR, being active and highly selective to N2. The addition of SO2 markedly improved NO and NH3 conversions during NH3-SCR in the presence of H2O. The improvement in acidic surface properties is believed to be the cause.

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Section: Introductionmentioning

confidence: 99%

Novel Preparation of Cu and Fe Zirconia Supported Catalysts for Selective Catalytic Reduction of NO with NH3

Świrk

Wang

et al. 2021

Catalysts

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“…49 This shows that, when the Cu/Al ratio increases, [Cu(OH)] + in the CHA cage is more likely to aggregate to form CuO x species. 50 Therefore, compared with the peak δ with no obvious change in peak intensity, a decrease in the γ – α peak intensity can be observed. In addition, we also find that in the XPS results, the content of Cu + on the surface of the zeolite has a more obvious decreasing trend as the copper loading increases because Cu + is partly derived from the self-reduction phenomenon caused by the elevated temperature.…”

Section: Resultsmentioning

confidence: 92%

Understanding the superior NH₃-SCR activity of CHA zeolite synthesized via template-free interzeolite transformation

Sun

Wang

et al. 2022

Inorg. Chem. Front.

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“…Zr not only improved the NOx conversion rate over the full temperature range but also widened the temperature window at high conversion rates. The doping of Zr formed ZrO 2 , and it formed a passivated solid solution with CuO, which reduced the damage to the skeleton . The highly dispersed ZrO 2 enhanced the high-temperature activity of the catalyst …”

Section: Results and Discussionmentioning

confidence: 99%

“…The doping of Zr formed ZrO 2 , and it formed a passivated solid solution with CuO, which reduced the damage to the skeleton. 47 The highly dispersed ZrO 2 enhanced the high-temperature activity of the catalyst. 48 4.3.…”

Section: Resultsmentioning

confidence: 99%

Effects of Catalyst Physicochemical Properties on the Catalytic Activity of Cu Zeolite Selective Catalytic Reduction at Different Inlet Gas Conditions

Tan

Yin

et al. 2021

Energy Fuels

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Selective catalytic reduction (SCR) systems are important technical means of mitigating NOx emissions for diesel engines. The major challenge of this technique is to improve the low-temperature activity of the catalyst during engine cold start and the thermal stability on repeated exposure to high-temperature exhaust. A two-stage SCR system with a Cu-SSZ-13 catalyst was analyzed with SCR sample experiments and NH3 oxidation experiments. The effects of copper content, doping metals, structural arrangement, NO2/NOx ratio, and NH3/NOx ratio (ANR) on the NOx conversion reaction at different temperatures were investigated. Furthermore, the Cu-SSZ-13 catalyst activity was characterized by Fourier transform infrared spectroscopy, H2 temperature-programmed reduction, and X-ray diffraction. The results showed that the low-temperature catalytic performance first increased with increasing copper content and decreased with a further increase. The optimal value of copper content was around 3.4%. The thermal stability of Cu-SSZ-13 catalysts decreased with the increase in the copper content. The temperature window of the high NOx conversion rate was widened by doping Zr/Mn/Ce, and the temperature window was widened by 15.1–33.1%. The two-stage SCR system was compared with a single SCR, which showed that the NH3 oxidation rate increased by 46.9–88.7%, the NOx conversion rate increased by 67.7–85.5%, and T90 was optimized by 3.3–13.5% during engine cold start. This made the total NOx conversion rate to maintain a high level above 80% at temperatures over 500 °C. An appropriate NO2/NOx ratio and ANR could improve the NOx conversion rate at a low-temperature range.

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Enhancement of high-temperature selectivity on Cu-SSZ-13 towards NH3-SCR reaction from highly dispersed ZrO2

Cited by 54 publications

References 28 publications

Novel Preparation of Cu and Fe Zirconia Supported Catalysts for Selective Catalytic Reduction of NO with NH3

Novel Preparation of Cu and Fe Zirconia Supported Catalysts for Selective Catalytic Reduction of NO with NH3

Understanding the superior NH₃-SCR activity of CHA zeolite synthesized via template-free interzeolite transformation

Effects of Catalyst Physicochemical Properties on the Catalytic Activity of Cu Zeolite Selective Catalytic Reduction at Different Inlet Gas Conditions

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Enhancement of high-temperature selectivity on Cu-SSZ-13 towards NH3-SCR reaction from highly dispersed ZrO2

Cited by 54 publications

References 28 publications

Novel Preparation of Cu and Fe Zirconia Supported Catalysts for Selective Catalytic Reduction of NO with NH3

Novel Preparation of Cu and Fe Zirconia Supported Catalysts for Selective Catalytic Reduction of NO with NH3

Understanding the superior NH3-SCR activity of CHA zeolite synthesized via template-free interzeolite transformation

Effects of Catalyst Physicochemical Properties on the Catalytic Activity of Cu Zeolite Selective Catalytic Reduction at Different Inlet Gas Conditions

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Understanding the superior NH₃-SCR activity of CHA zeolite synthesized via template-free interzeolite transformation