NH3-SCR performance improvement of mesoporous Sn modified Cr-MnOx catalysts at low temperatures

Qiu, Mingying; Zhan, Sihui; Zhu, Dandan; H, Yu; Shi, Qiang

doi:10.1016/j.cattod.2015.03.049

Cited by 55 publications

(28 citation statements)

References 54 publications

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“…Various transition-metal oxides have been proved to be active for the NH 3 -SCR at low-temperature. However, the catalytic performance on single transition metal oxide is far from satisfactory due to their low specific surface area and thermal instability [38][39][40][41]. The addition of dopants is a common method to improve the drawbacks associated with pure transition metal oxide.…”

Section: Binary Transition Metal-based Catalystsmentioning

confidence: 99%

A Review of Low Temperature NH3-SCR for Removal of NOx

et al. 2019

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The importance of the low-temperature selective catalytic reduction (LT-SCR) of NOx by NH3 is increasing due to the recent severe pollution regulations being imposed around the world. Supported and mixed transition metal oxides have been widely investigated for LT-SCR technology. However, these catalytic materials have some drawbacks, especially in terms of catalyst poisoning by H2O or/and SO2. Hence, the development of catalysts for the LT-SCR process is still under active investigation throughout seeking better performance. Extensive research efforts have been made to develop new advanced materials for this technology. This article critically reviews the recent research progress on supported transition and mixed transition metal oxide catalysts for the LT-SCR reaction. The review covered the description of the influence of operating conditions and promoters on the LT-SCR performance. The reaction mechanism, reaction intermediates, and active sites are also discussed in detail using isotopic labelling and in situ FT-IR studies.

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Section: Binary Transition Metal-based Catalystsmentioning

confidence: 99%

A Review of Low Temperature NH3-SCR for Removal of NOx

et al. 2019

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“…All of the spectra show two main peaks of Cr2p 1/2 (573–580 eV) and Cr2p 3/2 (585–588 eV). The Cr2p1/2 is deconvoluted to three components at 575.6, 576.6 and 578.2 eV, corresponding to Cr 2+ , Cr 3+ and Cr 6+ , respectively . At the same time, the Cr2p3/2 is fitted by three peaks at 585.2, 586.3 and 587.2 eV, corresponding to Cr 2+ , Cr 3+ and Cr 6+ , respectively.…”

Section: Resultsmentioning

confidence: 99%

“…The Cr2p1/2 is deconvoluted to three components at 575.6, 576.6 and 578.2 eV, corresponding to Cr 2+ , Cr 3+ and Cr 6+ , respectively. [25][26][27] At the same Table 3. As shown in Table 3, the Cr 6+ :Cr species molar ratio of catalysts decreased with increasing Cr loadings; thus, the Cr(1)/ZP (36.74%) exhibits the largest amount of Cr 6+ species over the surface of catalysts.…”

Section: Aciditymentioning

confidence: 88%

Catalytic oxidation of tricholoethylene over Cr/ZSM‐5/PSSF zeolite membrane catalysts prepared by chemical vapor deposition

Zhang

Yan

2019

J of Chemical Tech & Biotech

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BACKGROUND Chemical vapor deposition (CVD) is a promising catalyst preparation method owing to high dispersion and small particles of metallic oxides. Besides, the ZSM‐5 zeolite membrane is used to treat volatile organic compounds (VOCs) due to relatively high contact efficiency, lower bed pressure drop and mass transfer resistance than granular ZSM‐5, giving good stability of the metal catalysts. However, Cr modified ZSM‐5 zeolite membrane prepared by CVD for trichloroethylene (TCE) catalytic oxidation was still not well‐studied. In the present study, a series of Cr(x)/ZSM‐5/PSSF (x = 1, 3, 5 and 7) catalysts with different Cr loadings was prepared by CVD and further characterized by nitrogen gas (N2) adsorption and desorption, X‐ray diffraction (XRD), scanning electron microscopy (SEM), ammonia temperature‐programmed desorption (NH3‐TPD) and X‐ray photoelectron spectroscopy (XPS), as well as catalytic performance for TCE oxidation. RESULTS The results showed that the Cr2O3 species were uniformly dispersed on the surface of ZSM‐5/PSSF, and that the Cr(1)/ZP catalyst exhibited the best catalytic activity for TCE oxidation owing to more Cr6+ species and adsorbed oxygen. It also demonstrated that the Cr(1)/ZP catalyst shows superior catalytic performance for TCE oxidation, giving a T90 that is about 62 °C (c.15%) lower than 1% Cr/ZSM‐5 particle catalyst. Furthermore, it exhibited an excellent stability after online testing at 440 °C for 30 h, and then dropped from 91% to 62% after 95 h, finally remaining at 62% after 120 h. CONCLUSION The study demonstrated that Cr/ZSM‐5 zoelite membrane catalysts prepared by CVD show better catalytic behavior and stability for catalytic oxidation of TCE than Cr/ZSM‐5 zoelite catalysts. © 2019 Society of Chemical Industry

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“…In addition, vanadium species are toxic and can cause secondary pollution to the environment. [9,10] Most catalysts currently studied have significantly improved lowtemperature activity. However, such catalysts cannot be used in practical applications owing to the drawbacks of H 2 O and SO 2 poisoning at low temperatures, which is the bottleneck of SCR technology at low temperatures.…”

Section: Introductionmentioning

confidence: 99%

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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NH3-SCR performance improvement of mesoporous Sn modified Cr-MnOx catalysts at low temperatures

Cited by 55 publications

References 54 publications

A Review of Low Temperature NH3-SCR for Removal of NOx

A Review of Low Temperature NH3-SCR for Removal of NOx

Catalytic oxidation of tricholoethylene over Cr/ZSM‐5/PSSF zeolite membrane catalysts prepared by chemical vapor deposition

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

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NH3-SCR performance improvement of mesoporous Sn modified Cr-MnOx catalysts at low temperatures

Cited by 55 publications

References 54 publications

A Review of Low Temperature NH3-SCR for Removal of NOx

A Review of Low Temperature NH3-SCR for Removal of NOx

Catalytic oxidation of tricholoethylene over Cr/ZSM‐5/PSSF zeolite membrane catalysts prepared by chemical vapor deposition

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

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