Effects of SiO2/Al2O3 ratio, reaction atmosphere and metal additive on de-NOx performance of HC-SCR over Cu-based ZSM-5

Lee, Kyung-Seok; Choi, Byungchul; Lee, Chun-Beom; Oh, Kwang Chul

doi:10.1016/j.jiec.2020.07.005

Cited by 25 publications

(10 citation statements)

References 81 publications

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“…9(b) , the O 1s could be divided into chemisorbed oxygen (O α , 531.2 eV) and lattice oxygen (O β , 529.6 eV). 42–44 Similar to the change of the Ti 2p, the addition of citric acid monohydrate caused the shift of the O 1s. Compared with WZ/T, the chemisorbed oxygen concentrations of 5C-WZ/T, 10C-WZ/T and 15C-WZ/T decreased obviously.…”

Section: Resultsmentioning

confidence: 91%

Selective catalytic reduction of NO over W–Zr-O_x/TiO₂: performance study of hierarchical pore structure

Jin

et al. 2021

RSC Adv.

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Section: Resultsmentioning

confidence: 91%

Selective catalytic reduction of NO over W–Zr-O_x/TiO₂: performance study of hierarchical pore structure

Jin

et al. 2021

RSC Adv.

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“…However, according to the results of textural properties of the catalysts summarized in Table , after In 2 O 3 doping, the BET surface area of HZSM-5 increased from 343.85 to 426.03 m 2 g –1 , while the pore volumes are similar, indicating that the dispersion of In 2 O 3 particles onto HZSM-5 has been successfully made without disrupting the original textural structures of HZSM-5. Moreover, after In 2 O 3 impregnation, the BET surface area of HZSM-5 was increased due to the elimination of impurities. , …”

Section: Resultsmentioning

confidence: 98%

“…Moreover, after In 2 O 3 impregnation, the BET surface area of HZSM-5 was increased due to the elimination of impurities. 23,24 Figure 5 shows the NH 3 -TPD patterns of the supports and fresh catalysts. The results showed that the pure silica Q-10 In general, we can classify the acid site strength as weak, moderate, and strong by the temperature of desorption of ammonia gas.…”

Section: Characterization Of the Catalystsmentioning

confidence: 99%

Highly Efficient Conversion of Glycerol to Acetaldehyde Over In₂O₃/HZSM-5 Catalysts

Atchimarungsri

Gao

et al. 2022

ACS Sustainable Chem. Eng.

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The dehydration of glycerol, a major byproduct from biodiesel production, is a key step for the production of acetaldehyde. However, the selectivity toward acetaldehyde is presently not satisfactory. In the present work, In 2 O 3 supported on the HZSM-5 zeolite was prepared by a simple impregnation method and applied as a tandem catalyst for glycerol dehydration. Surprisingly, the 3%In 2 O 3 /HZSM-5(500) catalyst exhibits a high selectivity to acetaldehyde of 80% with a glycerol conversion of 100% at a reaction temperature of 340 °C. The characterization results showed that the amount of total acidity and Brønsted acid sites decreased, while the amount of Lewis acid sites increased, after the introduction of In 2 O 3 into the HZSM-5(500) zeolite, which is responsible for the high selectivity to acetaldehyde.

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“…Lee et al 52 studied the effects of zeolite types (SSZ-13, ZSM-5, and BEA) and Cu content (1−10 wt %) on the catalytic activity of C 4 H 10 -SCR, and activities from high to low are 2Cu/ZSM-5, 10Cu/Beat, and 1Cu/SSZ-13, with the NO conversion rates being 74, 58, and 38%, respectively. Choi et al 62 improved the HC-SCR activity of Cu−ZSM-5 by changing the silicon/ aluminum ratio, the reaction gas composition, and doping with metal additives. The study found that the best silicon/ aluminum ratio is 90, followed by 75 and 30, the reaction atmosphere is achieved by adding CO and H 2 , and the doped metals are Pt, Ce, Sn, and Mn.…”

Section: Study Of De-no X Methodsmentioning

confidence: 99%

Advances in De-NO_x Methods and Catalysts for Direct Catalytic Decomposition of NO: A Review

2021

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China is the country with the most coal-power generation and the most diesel vehicles in the world; it is of great significance to research the reduction of NO emissions. This paper summarizes five de-NO x methods, including adsorption, storage reduction, selective catalytic reduction, selective non-catalytic reduction, and direct catalytic decomposition, and explores the current research state and problems existing in actual application of each method. The direct catalytic decomposition method is focused especially, and research progresses of six major catalysts used in this method are summarized, including noble metals, metal oxides, perovskite-type composite oxide, hydrotalcite materials, heteropoly acid, and Cu–ZSM-5. The activity and O2 tolerance of each catalyst are compared, and future research directions are given. Cu–ZSM-5 is studied in detail as a result of its high activity and O2 tolerance and reviewed from three aspects, including the influence of preparation and reaction conditions on activity, the mechanism of catalytic decomposition, and doping modification. Finally, the future research directions of NO decomposition are discussed.

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Effects of SiO2/Al2O3 ratio, reaction atmosphere and metal additive on de-NOx performance of HC-SCR over Cu-based ZSM-5

Cited by 25 publications

References 81 publications

Selective catalytic reduction of NO over W–Zr-O_x/TiO₂: performance study of hierarchical pore structure

Selective catalytic reduction of NO over W–Zr-O_x/TiO₂: performance study of hierarchical pore structure

Highly Efficient Conversion of Glycerol to Acetaldehyde Over In₂O₃/HZSM-5 Catalysts

Advances in De-NO_x Methods and Catalysts for Direct Catalytic Decomposition of NO: A Review

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Effects of SiO2/Al2O3 ratio, reaction atmosphere and metal additive on de-NOx performance of HC-SCR over Cu-based ZSM-5

Cited by 25 publications

References 81 publications

Selective catalytic reduction of NO over W–Zr-Ox/TiO2: performance study of hierarchical pore structure

Selective catalytic reduction of NO over W–Zr-Ox/TiO2: performance study of hierarchical pore structure

Highly Efficient Conversion of Glycerol to Acetaldehyde Over In2O3/HZSM-5 Catalysts

Advances in De-NOx Methods and Catalysts for Direct Catalytic Decomposition of NO: A Review

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Selective catalytic reduction of NO over W–Zr-O_x/TiO₂: performance study of hierarchical pore structure

Selective catalytic reduction of NO over W–Zr-O_x/TiO₂: performance study of hierarchical pore structure

Highly Efficient Conversion of Glycerol to Acetaldehyde Over In₂O₃/HZSM-5 Catalysts

Advances in De-NO_x Methods and Catalysts for Direct Catalytic Decomposition of NO: A Review