Research progress of Cu-based and Ce-based catalysts for the selective catalytic reduction of NO with CO

Wang, He; Dang, Xiaoqing; Huang, Yu; Wang, Wei; Yan, Dongjie; Yu, Xin; Ren, Yitong; Qu, Jiaxin

doi:10.1016/j.surfin.2024.104310

Cited by 3 publications

(1 citation statement)

References 128 publications

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“…Samples were spread on the mesh plate of the reactor to form a catalyst layer (thickness = 30 mm and diameter = 20 mm), and accurate temperature regulation was realized using a vertical tube furnace. Depending on the practical flue gas composition and concentration of the power station boiler, − the simulated feed gas was established as 200 ppm of NO, 400 ppm of CO, 8 vol % O 2 , 20–200 ppm of SO 2 (if used), 8 vol % H 2 O (if used), and balance gas N 2 . The inlet flow was regulated by electronic flow meters at the flow rate of 2500 mL·min –1 and the gas hourly space velocity (GHSV) of 15915 h –1 .…”

Section: Methodsmentioning

confidence: 99%

Acidified SiO₂ Supported Fe-based Bimetal Oxide Catalyst with Resistance to High-Level Alkali Poisoning for CO Selective Catalytic Reduction of NO Removal of NO_x

Wu,

Li,

Ran

et al. 2024

Ind. Eng. Chem. Res.

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Catalyst deactivation deduced by alkali metals remains an austere challenge for CO selective catalytic reduction of NO (CO-SCR). Herein, the acidified SiO 2 supported Fe-based bimetal oxide catalyst was synthesized after active component screening and carrier acidification. The obtained FeCu-H catalyst exhibited excellent resistance to high-level alkali poisoning, even at low temperatures, with 78% NO conversion and 83% CO conversion achieved under 150 °C and a 1:1 molar ratio of Na to active metals. Characterizations and density functional theory (DFT) simulations revealed that the deactivation mechanism of CO-SCR catalysts by alkali metals can be ascribed to the deteriorated physicochemical properties, including crystallinity, specific surface area and pore structure, proportion of high-valence metals, NO adsorption and activation capacity, formation of oxygen vacancies, quantity of acid sites, and reducibility. Notably, the acidified carrier exhibited remarkable mitigation of these undesirable effects, thereby enhancing the CO-SCR activity. Our findings provide an inspirational strategy for developing reliable alkali-resistant SCR catalysts.

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Section: Methodsmentioning

confidence: 99%

Acidified SiO₂ Supported Fe-based Bimetal Oxide Catalyst with Resistance to High-Level Alkali Poisoning for CO Selective Catalytic Reduction of NO Removal of NO_x

Wu,

Li,

Ran

et al. 2024

Ind. Eng. Chem. Res.

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Calcium-Poison-Resistant Cu/YCeO₂–TiO₂ Catalyst for the Selective Catalytic Reduction of NO with CO and Naphthalene in the Presence of Oxygen

Herrera,

Aguila,

Zhu

et al. 2024

ACS Omega

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The pollution from industrial processes based on biomass combustion is still an ongoing problem. In the present contribution, the selective catalytic reduction of NO with CO and naphthalene is carried out in the presence of 10% oxygen. The accumulation of alkaline and alkaline earth metals during biomass combustion is here simulated by the addition of calcium to a Cu-impregnated YCeO 2 −TiO 2 support. The results show that a high dispersion of copper is obtained, which is resistant to the accumulation of calcium. Full conversion of CO and naphthalene is achieved above 200 °C, whereas NO conversions of 80, 90, and 87% are obtained for the catalysts with Ca loadings of 2.6, 5.2, and 13%, respectively, at 350 °C. It is proposed that the high activity of the catalysts is ascribed to the formation of Cu−O x −Ce species and that the accumulation of Ca acts as a barrier to avoid copper sintering. It was found that different forms of carbonate and nitrite/nitrate species form during reaction, coexisting as adsorbed species during the SCR reaction. The selectivity to N 2 was almost 100% in all cases, due to the small presence of NO 2 in the reactor outlet (no N 2 O was detected in any conditions).

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Impact of Alkali Metals on CeO2-WO3/TiO2 Catalysts for NH3-Selective Catalytic Reduction and Lifetime Prediction of Catalysts

Xu,

Deng,

Gao

et al. 2024

Molecules

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Ce-based catalysts have been widely used in the removal of nitrogen oxides from industrial flue gas because of their good catalytic performance and environmental friendliness. However, the mechanism of alkali metal poisoning in Ce-based catalysts remains to be further studied. This work involves the preparation of the K/Na-poisoned CeWTi catalyst via the impregnation method for assessing its performance in NO removal. Experiments show that both K and Na exhibit detrimental effects on the CeWTi catalyst, and the loading of alkali metal reduces the specific surface area and pore volume of the catalyst. Furthermore, the presence of alkaline metals results in a notable decline in the CeWTi acid concentration, particularly in Lewis acid sites. Concurrently, the levels of Ce3+, oxygen vacancies, and reducing agents on the catalyst surface decrease, leading to diminished reduction capability and eventual catalyst deactivation. The application of a BP neural network for catalyst activity prediction yielded an average relative error of approximately 0.73%, indicating enhanced accuracy in prediction outcomes. This work explored the cause of alkali metal poisoning of the CeWTi catalyst and provided an effective prediction method for the lifetime of CeWTi catalyst, which provided theoretical guidance for the engineering application of Ce-based catalysts.

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Research progress of Cu-based and Ce-based catalysts for the selective catalytic reduction of NO with CO

Cited by 3 publications

References 128 publications

Acidified SiO₂ Supported Fe-based Bimetal Oxide Catalyst with Resistance to High-Level Alkali Poisoning for CO Selective Catalytic Reduction of NO Removal of NO_x

Acidified SiO₂ Supported Fe-based Bimetal Oxide Catalyst with Resistance to High-Level Alkali Poisoning for CO Selective Catalytic Reduction of NO Removal of NO_x

Calcium-Poison-Resistant Cu/YCeO₂–TiO₂ Catalyst for the Selective Catalytic Reduction of NO with CO and Naphthalene in the Presence of Oxygen

Impact of Alkali Metals on CeO2-WO3/TiO2 Catalysts for NH3-Selective Catalytic Reduction and Lifetime Prediction of Catalysts

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Research progress of Cu-based and Ce-based catalysts for the selective catalytic reduction of NO with CO

Cited by 3 publications

References 128 publications

Acidified SiO2 Supported Fe-based Bimetal Oxide Catalyst with Resistance to High-Level Alkali Poisoning for CO Selective Catalytic Reduction of NO Removal of NOx

Acidified SiO2 Supported Fe-based Bimetal Oxide Catalyst with Resistance to High-Level Alkali Poisoning for CO Selective Catalytic Reduction of NO Removal of NOx

Calcium-Poison-Resistant Cu/YCeO2–TiO2 Catalyst for the Selective Catalytic Reduction of NO with CO and Naphthalene in the Presence of Oxygen

Impact of Alkali Metals on CeO2-WO3/TiO2 Catalysts for NH3-Selective Catalytic Reduction and Lifetime Prediction of Catalysts

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Acidified SiO₂ Supported Fe-based Bimetal Oxide Catalyst with Resistance to High-Level Alkali Poisoning for CO Selective Catalytic Reduction of NO Removal of NO_x

Acidified SiO₂ Supported Fe-based Bimetal Oxide Catalyst with Resistance to High-Level Alkali Poisoning for CO Selective Catalytic Reduction of NO Removal of NO_x

Calcium-Poison-Resistant Cu/YCeO₂–TiO₂ Catalyst for the Selective Catalytic Reduction of NO with CO and Naphthalene in the Presence of Oxygen