Enhancement of low-temperature activity and sulfur resistance of Fe 0.3 Mn 0.5 Zr 0.2 catalyst for NO removal by NH 3 -SCR

Fang, Ningjie; Guo, Juan; Song, Shaoxian; Luo, Hongdi; Chu, Ying‐Hao; Jian-jun, LI

doi:10.1016/j.cej.2017.05.053

Cited by 148 publications

(44 citation statements)

References 47 publications

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“…NH 3 ‐desoprtion peaks shifted to higher temperature for Mo sample, indicating more and stronger acid sites . This could be owing to the interaction between Mo and MnCe, which led to the increase of the metal–oxygen coordination bond length and surface acidity . It was acknowledged that the peak between 100–400 °C was mainly ascribed to the NH 3 desorption from weak and medium Lewis and Brønsted acid sites, while peaks above 300 °C usually were attributed to Brønsted acid sites .…”

Section: Resultsmentioning

confidence: 97%

“…7(b)). The observed broad peaks were deconvoluted into two sub‐peaks according to previous literatures . The qualitative H 2 consumptions (μmol·g −1 ) were calculated by integrating the peak areas and listed in Table .…”

Section: Resultsmentioning

confidence: 99%

“…Figure 7(d) of O 1 s XPS was deconvoluted into three peaks that the peak centered at 530 eV could be attributed to the lattice oxygen species (O latt , O 2− ), the peak centered at 532 eV was ascribed to the adsorbed oxygen species (O ad , O − and O 2 2− ), and the peak centered at 534 eV for surface adsorbed water (O w , OH − ). The O w peak was so weak (< 2%) that it was not taken into further calculation . The O ad was considered more oxidative because it could not only facilitate NO x oxidation to NO 2 to promote the ‘fast SCR’ (4NH 3 + 2NO + 2NO 2 → 4 N 2 + 6H 2 O), but also easily exchange with gas oxygen and/or the oxygen in the adsorbed molecules to promote reaction .…”

Section: Resultsmentioning

confidence: 99%

“…ZrO 2 has been previously used as SCR catalyst carrier due to its excellent thermal stability, surface acidity, although its redox ability should be neglected in the low temperature SCR because Zr 4+ ions were unreducible below 800 °C. ZrO 2 can interact with the metallic active components which lead to the change of electronic structure and oxidative states of the metallic components and promote NO x conversion …”

Section: Introductionmentioning

confidence: 99%

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Molybdenum modified Montmonrillonite clay as an efficient catalyst for low temperature NH₃‐SCR

Chen

Feng

Sun

et al. 2020

J of Chemical Tech & Biotech

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Background Selective catalytic reduction of nitrogen oxides with ammonia (NH3‐SCR) is an effective method for the nitrogen oxides (NOx) removal. This study aimed to develop a highly efficient NH3‐SCR catalyst using the naturally available Montmonrillonite (Mt) clay as the catalyst support. Results Mt was processed into PILC by Al/Zr intercalations, impregnated with MnCe mixed active components and loaded with transition metals to achieve X‐AlZr‐PILC‐MnCe (X = V, W, Co or Mo) catalysts. The optimized Mo‐AlZr‐PILC‐MnCe showed the best NH3‐SCR performance with a NO conversion rate of nearly 100% in the temperature range of 240–300 °C, and N2 selectivity of above 85% in the range of 140–300 °C. Conclusions The catalysts were characterized by SEM, BET, XRD, XPS, H2‐TPR, NH3‐TPD to define the relationships between structure, chemical properties and catalytic activity. The enhanced catalytic performance of Mo‐AlZr‐PILC‐MnCe was mainly owing to the increased acidity and better redox ability. In situ DRIFT studies indicated the deposition of Mo changed the reaction from the E‐R to the L‐H mechanism. © 2020 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Molybdenum modified Montmonrillonite clay as an efficient catalyst for low temperature NH₃‐SCR

Chen

Feng

Sun

et al. 2020

J of Chemical Tech & Biotech

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“…[32] It was found that the modification with Fe can improve the H 2 O resistance of MnO x À CeO 2 catalysts. Strong interactions occurring among Fe, Mn and Zr of the Fe 0.3 Mn 0.5 Zr 0.2 catalyst result in the strong thermal stability and SO 2 resistance of the catalyst.…”

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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Mno_x Nanoenzyme Armed CAR‐NK Cells Enhance Solid Tumor Immunotherapy by Alleviating the Immunosuppressive Microenvironment

Duan,

Zhao,

Duan

et al. 2024

Adv Healthcare Materials

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Adoptively transferred cells usually suffer from exhaustion, limited expansion, and poor infiltration, partially attributing to the complicated immunosuppressive microenvironment of solid tumors. Therefore, it is necessary to explore more effective strategies to improve the poor tumor microenvironment (TME) to efficaciously deliver and support extrinsic effector cells in vivo. Herein, an intelligent biodegradable hollow manganese dioxide nanoparticle (MnOX) that possesses peroxidase activity to catalyze excess H2O2 in the TME to produce oxygen and relieve the hypoxia of solid tumors is developed. MnOX nanoenzymes modified with CD56 antibody could specifically bind CAR‐NK (chimeric antigen receptor modified natural killer) cells. It is demonstrated that CAR‐NK cells incorporated with MnOX nanoenzymes effectively infiltrate into tumor tissues with an improved TME, which results in superior antitumor activity in solid tumor‐bearing mice. The antibody connection between MnOX nanoenzymes and CAR‐NK endows the lowest efficient dosage of MnOX. This study features a smart synergistic immunotherapy approach for solid tumors using MnOX nanoenzyme‐armed CAR‐NK cells, which would provide a valuable tool for immunocyte therapy in solid tumors.

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Enhancement of low-temperature activity and sulfur resistance of Fe 0.3 Mn 0.5 Zr 0.2 catalyst for NO removal by NH 3 -SCR

Cited by 148 publications

References 47 publications

Molybdenum modified Montmonrillonite clay as an efficient catalyst for low temperature NH₃‐SCR

Molybdenum modified Montmonrillonite clay as an efficient catalyst for low temperature NH₃‐SCR

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

Mno_x Nanoenzyme Armed CAR‐NK Cells Enhance Solid Tumor Immunotherapy by Alleviating the Immunosuppressive Microenvironment

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Enhancement of low-temperature activity and sulfur resistance of Fe 0.3 Mn 0.5 Zr 0.2 catalyst for NO removal by NH 3 -SCR

Cited by 148 publications

References 47 publications

Molybdenum modified Montmonrillonite clay as an efficient catalyst for low temperature NH3‐SCR

Molybdenum modified Montmonrillonite clay as an efficient catalyst for low temperature NH3‐SCR

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

Mnox Nanoenzyme Armed CAR‐NK Cells Enhance Solid Tumor Immunotherapy by Alleviating the Immunosuppressive Microenvironment

Contact Info

Product

Resources

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Molybdenum modified Montmonrillonite clay as an efficient catalyst for low temperature NH₃‐SCR

Molybdenum modified Montmonrillonite clay as an efficient catalyst for low temperature NH₃‐SCR

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

Mno_x Nanoenzyme Armed CAR‐NK Cells Enhance Solid Tumor Immunotherapy by Alleviating the Immunosuppressive Microenvironment