Adsorption / Desorption Performance and NOx Removal Efficiency of BaO Loaded V2O5-WO3/TiO2 Selective Catalytic Reduction Catalyst

Ammonia/urea selective catalytic reduction is an efficient technology to control NOx emission from diesel engines. One of its critical challenges is the performance degradation of selective catalytic reduction catalysts due to the hydrothermal aging experienced in real-world operations during the lifetime. In this study, hydrothermal aging effects on the reduction of ammonia adsorption capacity over a commercial Cu-zeolite selective catalytic reduction catalyst were investigated under actual engine exhaust conditions. Ammonia adsorption site densities of the selective catalytic reduction catalysts aged at two different temperatures of 750°C and 850°C for 25 h with 10% H2O were experimentally measured and compared to that of fresh catalyst on a dynamometer test bench with a heavy-duty diesel engine. The test results revealed that hydrothermal aging significantly decreased the ammonia adsorption capacity of the current commercial Cu-zeolite selective catalytic reduction catalyst. Hydrothermal treatment at 750°C reduced the ammonia adsorption site to 62.5% level of that of fresh catalyst, while hydrothermal treatment at 850°C lowered the adsorption site to 37.0% level of that of fresh catalyst. Also, in this study, numerical simulation and kinetic analysis were carried out to quantify the impact of hydrothermal aging on the reduction of ammonia adsorption capacity by introducing an aging coefficient. The kinetic parameter calibrations based on actual diesel engine tests with a commercial monolith Cu-zeolite selective catalytic reduction catalyst provided a highly realistic kinetic parameter set of ammonia adsorption/desorption and enabled a mathematical description of hydrothermal aging effect.

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Ammonia Storage and Slip in a Urea Selective Catalytic Reduction Catalyst under Steady and Transient Conditions

Industrial & Engineering Chemistry Research ◽

10.1021/ie201045w ◽

2011 ◽

Vol 50 (21) ◽

pp. 11863-11871 ◽

Cited By ~ 29

Author(s):

Yanguang Zhao ◽

Jing Hu ◽

Lun Hua ◽

Shijin Shuai ◽

Jianxin Wang

Keyword(s):

Selective Catalytic Reduction ◽

Catalytic Reduction ◽

Selective Catalytic Reduction Catalyst ◽

Transient Conditions ◽

Ammonia Storage

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Effect of manganese and/or ceria loading on V2O5–MoO3/TiO2 NH3 selective catalytic reduction catalyst

Journal of Rare Earths ◽

10.1016/j.jre.2019.05.017 ◽

2020 ◽

Vol 38 (7) ◽

pp. 725-734 ◽

Cited By ~ 1

Author(s):

Daojun Zhang ◽

Ziran Ma ◽

Baodong Wang ◽

Tao Zhu ◽

Duan Weng ◽

...

Keyword(s):

Selective Catalytic Reduction ◽

Catalytic Reduction ◽

Selective Catalytic Reduction Catalyst

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

Catalysts ◽

10.3390/catal10010052 ◽

2020 ◽

Vol 10 (1) ◽

pp. 52 ◽

Cited By ~ 4

Author(s):

Hyo-Sik Kim ◽

Saravanan Kasipandi ◽

Jihyeon Kim ◽

Suk-Hwan Kang ◽

Jin-Ho Kim ◽

...

Keyword(s):

Air Pollution ◽

Nitrogen Oxides ◽

South Korea ◽

Selective Catalytic Reduction ◽

Catalytic Reduction ◽

Research Trends ◽

Nox Emissions ◽

Nox Removal ◽

National Characteristics ◽

The World

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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