Promotional effects of zirconium doped CeVO 4 for the low-temperature selective catalytic reduction of NO x with NH 3

Zhao, Xin; Huang, Lei; Li, Hongrui; Hu, Hang; Hu, Xiaonan; Shi, Liyi; Zhang, Dengsong

doi:10.1016/j.apcatb.2015.10.052

Cited by 164 publications

(61 citation statements)

References 78 publications

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“…Zhang and Huang et al [333] developed a series of Ce1-xZrxVO4 solid solutions for NH3-SCR of NOx. The introduction of Zr into CeVO4 considerably enhanced the specific surface area, redox property, active oxygen species as well as surface acidity of the catalysts, which were favorable for the improvement of SCR performance.…”

Section: Effect Of Support Compositionmentioning

confidence: 99%

Structure, synthesis, and catalytic properties of nanosize cerium-zirconium-based solid solutions in environmental catalysis

Liu

Zhang

Chen

et al. 2019

Chinese Journal of Catalysis

109

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Section: Effect Of Support Compositionmentioning

confidence: 99%

Structure, synthesis, and catalytic properties of nanosize cerium-zirconium-based solid solutions in environmental catalysis

Liu

Zhang

Chen

et al. 2019

Chinese Journal of Catalysis

109

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“…The samples were outgassed at 120 • C for 4 h under vacuum before the measurement. The specific surface area and average pore diameter were calculated with the Brunauer-Emmett-Teller (BET) theory, while the pore volume was obtained from the N 2 desorption isotherm using Barrett-Joyner-Halenda (BJH) equations [44].…”

Section: Catalyst Characterizationmentioning

confidence: 99%

In Situ DRIFTS Investigation on CeOx Catalyst Supported by Fly-Ash-Made Porous Cordierite Ceramics for Low-Temperature NH3-SCR of NOX

Wang

Chen

et al. 2019

Catalysts

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A series of CeOx catalysts supported by commercial porous cordierite ceramics (CPCC) and synthesized porous cordierite ceramics (SPCC) from fly ash were prepared for selective catalytic reduction of NOx with ammonia (NH3-SCR). A greater than 90% NOx conversion rate was achieved by the SPCC supported catalyst at 250–300 °C when the concentration of loading precursor was 0.6 mol/L (denoted as 0.6Ce/SPCC), which is more advantageous than the CPCC supported ones. The EDS mapping results reveal the existence of evenly distributed impurities on the surface of SPCC, which hence might be able to provide more attachment sites for CeOx particles. Further measurements with temperature programmed reduction by hydrogen (H2-TPR) demonstrate more reducible species on the surface of 0.6Ce/SPCC, thus giving rise to better NH3-SCR performance at a low-temperature range. The X-ray photoelectron spectroscopy (XPS) analyses reveal that the Ce atom ratio is higher in 0.6Ce/SPCC, indicating that a higher concentration of catalytic active sites could be found on the surface of 0.6Ce/SPCC. The in situ diffused reflectance infrared fourier transform spectroscopy (DRIFTS) results indicate that the SCR reactions over 0.6Ce/SPCC follow both Eley-Rideal (E-R) and Langmuir-Hinshelwood (L-H) mechanisms. Hence, the SPCC might be a promising candidate to provide support for NH3-SCR catalysts, which also provide a valuable approach to recycling the fly ash.

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“…[67] The incorporation of zirconium to CeVO 4 also provides excellent SCR performances at low temperature with NO x selectively converted to nitrogen in the temperature range 150-375 8C. [83] The gain observed on the performances was essentially attributed to the promotion of Brønsted acid sites, surface area and improved redox properties of VO x species. This investigation point out the relative high stability to sulfur (200 ppm SO 2 ) poisoning at 190 8C with a reversible deactivation observed in those operating conditions.…”

Section: Thermally Resistant Bulk V-scr Systemsmentioning

confidence: 99%

What News in the Surface Chemistry of Bulk and Supported Vanadia Based SCR‐Catalysts: Improvements in their Resistance to Poisoning and Thermal Sintering

Granger

Siaka

Umbarkar

2018

The Chemical Record

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This paper reports a short review on the impact of poisoning effects and thermal aging on the reactivity of surface vanadate species on benchmark V2O5−WO3/TiO2 Selective‐Catalytic‐Reduction catalysts. A renewed interest of this SCR technology is related to its diversification notably as after‐treatment systems to treat the exhaust from Diesel engines with higher running temperature especially when SCR catalysts are coated on Diesel Particulates Filters. Particular attention is also paid to poisoning effects in conjunction with the progressive replacement of fossil fuels by bio‐fuels containing alkaline contaminants which drastically deactivate the catalyst through neutralization of strong acid sites. Most of the investigations show that better insight into the mechanisms of poisoning and aging processes is needed especially to understand the relative sensibility of various vanadate species. This could provide original guidelines to catalyst preparation and or the developments of more stable bulk systems as exemplified.

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Promotional effects of zirconium doped CeVO 4 for the low-temperature selective catalytic reduction of NO x with NH 3

Cited by 164 publications

References 78 publications

Structure, synthesis, and catalytic properties of nanosize cerium-zirconium-based solid solutions in environmental catalysis

Structure, synthesis, and catalytic properties of nanosize cerium-zirconium-based solid solutions in environmental catalysis

In Situ DRIFTS Investigation on CeOx Catalyst Supported by Fly-Ash-Made Porous Cordierite Ceramics for Low-Temperature NH3-SCR of NOX

What News in the Surface Chemistry of Bulk and Supported Vanadia Based SCR‐Catalysts: Improvements in their Resistance to Poisoning and Thermal Sintering

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