A study of NOx performance for Cu-chabazite SCR catalysts by Sulfur poisoning and desulfation

Nam, Jeong-Gil

doi:10.5916/jkosme.2013.37.8.855

Cited by 7 publications

(3 citation statements)

References 6 publications

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“…Using the Cu-chabazite SCR catalyst, Nam investigated the effect of reducing nitrogen oxides by SO 2 poisoning at low temperatures between 150 and 300 • C. The researcher was able to measure NO x reduction for two hours at 150 • C, and then again at the same temperature for another two hours. Although the reduction rate of NO x was reduced by 50% compared to the new one, it was reported that the higher temperature near to 300 • C, the effect of sulfur poisoning was almost eliminated [73].…”

Section: Marine Enginesmentioning

confidence: 82%

Current Catalyst Technology of Selective Catalytic Reduction (SCR) for NOx Removal in South Korea

et al. 2020

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Recently, air pollution has worsened throughout the world, and as regulations on nitrogen oxides (NOx) are gradually tightened many researchers and industrialists are seeking technologies to cope with them. In order to meet the stringent regulations, research is being actively conducted worldwide to reduce NOx-causing pollution. However, different countries tend to have different research trends because of their regional and industrial environments. In this paper, the results of recent catalyst studies on NOx removal by selective catalytic reduction are reviewed with the sources and regulations applied according to the national characteristics of South Korea. Specifically, we emphasized the three major NOx emissions sources in South Korea such as plant, automobile, and ship industries and the catalyst technologies used.

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Section: Marine Enginesmentioning

confidence: 82%

Current Catalyst Technology of Selective Catalytic Reduction (SCR) for NOx Removal in South Korea

et al. 2020

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“…However, recent studies have shown that the capacity of SCR catalysts to significantly improve NO x reduction ability is limited because of the degradation of catalyst performance due to sulfur poisoning. Additional research on catalyst life is needed in the future [8].…”

Section: Introductionmentioning

confidence: 99%

Exploring the Impact of Palladium Loading on Pd-Based Three-Way Catalyst Performance and Propane Reactivity for Emission Reduction in Liquefied Petroleum Gas Engines

Kim

2023

JMSE

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To reduce air pollution worldwide, regulations on exhaust gas emissions from ships are becoming increasingly stringent. One fuel that is being considered as an alternative to replace the heavy fuel oil used in existing ship engines and thereby reduce harmful emissions, such as NOx, SOx, and greenhouse gases, is sulfur-free liquefied petroleum gas (LPG). To assess the viability of this alternative, it is necessary to understand propane reactivity, the main component of LPG, and develop after-treatment devices applicable to LPG engines. This research evaluated the performance of three prototype Pd-based three-way catalysts (TWCs) with varying Pd loadings (6.5, 4.1, and 1.4 g/L), focusing on their effectiveness concerning propane reactivity in LPG engines. For the fresh samples, catalysts with 4.1 g/L Pd demonstrated performance that was comparable to, or even surpassed, those containing 6.5 g/L Pd. Notably, the temperature of 50% conversion (T50) for NO and C3H8 in the fresh Pd-4.1 was lower by 14 °C and 10 °C, respectively, compared to the fresh Pd-6.5 sample, despite having 37% less precious-metal loading. However, after hydrothermal aging at 900 °C for 100 h, the performance of the 4.1 g/L Pd catalyst significantly deteriorated, exhibiting lower efficiency than the 6.5 g/L Pd catalyst. The study also delved into various probe reactions, including the water–gas shift and propane steam reforming. Advanced analytical techniques, such as N2 physisorption and scanning transmission electron microscopy, were employed to elucidate the texture and structural characteristics of the catalyst, providing a comprehensive understanding of its behavior and potential applications. Through this research, within the efforts of the maritime sector to address challenges posed by emission regulations and rising costs associated with precious metals, this study has the potential to contribute to the development of cost-effective emission control solutions.

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“…Aiming to satisfy the nitrogen oxides (NOx) regulations of marine diesel engines, some studies have examined exhaust gas after-treatment systems. [10][11][12][13][14][15] Presently, to reduce NOx emissions from large marine diesel engines, two methods are used most frequently: selective catalytic reduction (SCR) and exhaust gas recirculation (EGR) systems. EGR supplies engine exhaust gas inside the engine cylinder and reduces NOx output by lowering the combustion temperature inside the cylinder.…”

Section: Introductionmentioning

confidence: 99%

Installation and characteristics of urea-selective catalytic reduction systems for nitrogen oxide reduction in marine diesel engine

Ryu

Kim

Cho³

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part M:

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Since 1 January 2016, the International Maritime Organization Tier III regulations concerning nitrogen oxides took effect. International Maritime Organization Tier III targets new ships weighing over 400 ton engaged in international sailing, especially those entering and leaving emission control areas. The number of emission control areas, including sulfur emission control areas, is forecasted to increase in Japanese seas and elsewhere; thus, all new ships intended for international sailing purposes must consider appropriate responses to these regulations. Currently, urea-selective catalytic reduction systems are frequently used to satisfy International Maritime Organization Tier III regulations in marine diesel engines, but these decrease ship engine performance due to increased engine exhaust gas pressure. Thus, following a study by Ryu et al., this research compares engine exhaust gas pressures at different engine loads (25%, 30%, 35%, 40%, 45%, and 50%) with the application of a thinner metal catalyst to a selective catalytic reduction reactor; metal catalyst thickness was reduced by 30% or more from the original sheet thickness of 0.1 t. Furthermore, 40% urea was injected into the exhaust gas line to conduct a comparative analysis of nitrogen oxide reduction. By changing the metal catalyst's sheet thickness, nitrogen oxide was reduced by more than 80%, while the engine exhaust gas pressure was lowered by approximately 13%-28%.

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A study of NOx performance for Cu-chabazite SCR catalysts by Sulfur poisoning and desulfation

Cited by 7 publications

References 6 publications

Current Catalyst Technology of Selective Catalytic Reduction (SCR) for NOx Removal in South Korea

Current Catalyst Technology of Selective Catalytic Reduction (SCR) for NOx Removal in South Korea

Exploring the Impact of Palladium Loading on Pd-Based Three-Way Catalyst Performance and Propane Reactivity for Emission Reduction in Liquefied Petroleum Gas Engines

Installation and characteristics of urea-selective catalytic reduction systems for nitrogen oxide reduction in marine diesel engine

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