An X-ray absorption study on copper-containing AlPO4-5 for selective catalytic reduction of NOX by propene

2001 ◽  
Vol 11 (5) ◽  
pp. 1441-1446 ◽  
Author(s):  
Ian D. Burton ◽  
Justin S. J. Hargreaves ◽  
David G. Nicholson ◽  
Merete H. Nilsen ◽  
Michael Stockenhuber
Keyword(s):  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Absorption Study ◽  
X Ray ◽  
Reduction Of Nox ◽  
X Ray Absorption

scholarly journals Cu- and Fe-speciation in a composite zeolite catalyst for selective catalytic reduction of NOx: insights from operando XAS

2021 ◽  
Author(s):  
Ilia A. Pankin ◽  
Houeida Issa Hamoud ◽  
Kirill A. Lomachenko ◽  
Søren Birk Rasmussen ◽  
Andrea Martini ◽  
...  
Keyword(s):  
Selective Catalytic Reduction ◽  
Absorption Spectroscopy ◽  
Zeolite Catalyst ◽  
Catalytic Reduction ◽  
Mechanical Mixture ◽  
X Ray ◽  
Fe Speciation ◽  
Reduction Of Nox ◽  
Operando Xas ◽  
X Ray Absorption

Cu-SAPO-34 (Cu-CZC) and Fe-mordenite (Fe-MOR) and their mechanical mixture (50 : 50) have been exhaustively investigated by means of operando X-ray absorption spectroscopy under NH3-SCR conditions.

Integrated operando X-ray absorption and DFT characterization of Cu–SSZ-13 exchange sites during the selective catalytic reduction of NOx with NH3

2012 ◽  
Vol 184 (1) ◽  
pp. 129-144 ◽  
Author(s):  
J.-S. McEwen ◽  
T. Anggara ◽  
W.F. Schneider ◽  
V.F. Kispersky ◽  
J.T. Miller ◽  
...  
Keyword(s):  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
X Ray ◽  
Reduction Of Nox ◽  
X Ray Absorption

An X-ray absorption study of copper ion exchanged H-mordenite for selective catalytic reduction of NO by ammonia

1991 ◽  
Vol 69 (2) ◽  
pp. 247-258 ◽  
Author(s):  
Young Choi Eun ◽  
Nam In-Sik ◽  
Gul Kim Young ◽  
Shik Chung Jong ◽  
Sung Lee Jae ◽  
...  
Keyword(s):  
Selective Catalytic Reduction ◽  
Catalytic Reduction ◽  
Copper Ion ◽  
Absorption Study ◽  
Reduction Of No ◽  
X Ray ◽  
X Ray Absorption

Insights into sulfur poisoning and regeneration of Cu-SSZ-13 catalysts: In situ Cu and S K-edge XAS studies

2021 ◽  
Author(s):  
Vitaly Mesilov ◽  
Sandra Dahlin ◽  
Susanna Liljegren Bergman ◽  
Peter Sams Hammershøi ◽  
Shibo Xi ◽  
...  
Keyword(s):  
Selective Catalytic Reduction ◽  
Oxidation State ◽  
Absorption Spectroscopy ◽  
Catalytic Reduction ◽  
Sulfur Poisoning ◽  
X Ray ◽  
Scr Catalysts ◽  
X Ray Absorption

In situ Cu and S K-edge X-ray absorption spectroscopy (XAS) was used for the investigation of sulfur-poisoned and regenerated Cu-SSZ-13 selective catalytic reduction (SCR) catalysts. Sulfur in the oxidation state...

TNU-9, a new zeolite for the selective catalytic reduction of NO: An in situ X-ray absorption spectroscopy study

2012 ◽  
Vol 295 ◽  
pp. 22-30 ◽  
Author(s):  
Cristina Franch-Martí ◽  
Cristina Alonso-Escobar ◽  
Jose L. Jorda ◽  
Inma Peral ◽  
Juan Hernández-Fenollosa ◽  
...  
Keyword(s):  
Selective Catalytic Reduction ◽  
Absorption Spectroscopy ◽  
Catalytic Reduction ◽  
Spectroscopy Study ◽  
Reduction Of No ◽  
X Ray ◽  
X Ray Absorption

scholarly journals Effect of SO2 on the Selective Catalytic Reduction of NOx over V2O5-CeO2/TiO2-ZrO2 Catalysts

Materials ◽  
2019 ◽  
Vol 12 (16) ◽  
pp. 2534
Author(s):  
Yaping Zhang ◽  
Peng Wu ◽  
Ke Zhuang ◽  
Kai Shen ◽  
Sheng Wang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Selective Catalytic Reduction ◽  
Volume Fraction ◽  
Catalytic Reduction ◽  
Surface Measurement ◽  
X Ray ◽  
Nox Conversion ◽  
Nh3 Adsorption ◽  
Reduction Of Nox

The effect of SO2 on the selective catalytic reduction of NOx by NH3 over V2O5-0.2CeO2/TiO2-ZrO2 catalysts was studied through catalytic activity tests and various characterization methods, like Brunner−Emmet−Teller (BET) surface measurement, X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray fluorescence (XRF), hydrogen temperature-programmed desorption (H2-TPR), X-ray photoelectron spectroscopy (XPS) and in situ diffused reflectance infrared Fourier transform spectroscopy (DRIFTS). The results showed that the catalyst exhibited superior SO2 resistance when the volume fraction of SO2 was below 0.02%. As the SO2 concentration further increased, the NOx conversion exhibited some degree of decline but could restore to the original level when stopping feeding SO2. The deactivation of the catalyst caused by water in the flue gas was reversible. However, when 10% H2O was introduced together with 0.06% SO2, the NOx conversion was rapidly reduced and became unrecoverable. Characterizations indicated that the specific surface area of the deactivated catalyst was significantly reduced and the redox ability was weakened, which was highly responsible for the decrease of the catalytic activity. XPS results showed that more Ce3+ was generated in the case of reacting with SO2. In situ DRIFTS results confirmed that the adsorption capacity of SO2 was enhanced obviously in the presence of O2, while the SO2 considerably refrained the adsorption of NH3. The adsorption of NOx was strengthened by SO2 to some extent. In addition, NH3 adsorption was improved after pre-adsorbed by SO2 + O2, indicating that the Ce3+ and more oxygen vacancy were produced.

scholarly journals Ion Exchange of One-Pot Synthesized Cu-SAPO-44 with NH4NO3 to Promote Cu Dispersion and Activity for Selective Catalytic Reduction of NOx with NH3

Catalysts ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 882 ◽  
Author(s):  
Nana Zhang ◽  
Ying Xin ◽  
Qian Li ◽  
Xicheng Ma ◽  
Yongxin Qi ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Ion Exchange ◽  
Selective Catalytic Reduction ◽  
Inductively Coupled Plasma ◽  
Catalytic Reduction ◽  
One Pot ◽  
X Ray ◽  
Inductively Coupled ◽  
Nh3 Scr ◽  
Reduction Of Nox

Cu-containing CHA type (Cu-CHA) zeolites have been widely investigated owing to their excellent low-temperature activity and high hydrothermal stability in selective catalytic reduction of NOx with NH3 (NH3-SCR). Herein, a series of Cu-SAPO-44 zeolites were prepared by one-pot method with dual-amine templates and the subsequent ion exchange (IE) with NH4NO3. The effect of NH4NO3 treatment on Cu species was investigated by X-ray powder diffraction (XRD), N2 adsorption-desorption isotherm, inductively coupled plasma (ICP); field-emission scanning electron microscope (FE-SEM), high-resolution transmission electron microscope (HRTEM), X-ray absorption fine structure (XAFS), and H2-temperature-programmed reduction (H2-TPR). The results indicated that—besides the main SAPO-44 structure—the CuO phase was detected by XRD in original samples. After IE with NH4NO3, the Cu contents decreased greatly from ICP analysis. The removal of CuO agglomerations and the presence of highly dispersed CuO nanoparticles (~2.36 nm) were confirmed by SEM, TEM and H2-TPR. Furthermore, a significant increase in the proportion of isolated Cu2+ was derived from XAFS. As a result, the activity at higher temperature (≥350 °C) was improved a lot.

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