Abstract
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.
Highlights
Climate change as a result of the promotion of industrialization and urbanization through economic growth around the world has increased awareness of the atmosphere
Since a is series of advantageous in terms of reactivity and efficiency, this technique could be applied in the future processes such as thermal decomposition and hydrolysis are not required in low-temperature areas, The characteristics of NO reduction rate, reaction rate, and ammonia slip of ammonia gas injection which is advantageous in termsx of reactivity and efficiency, this technique could be applied in the system were evaluated by Jung et al via preparing ammonia gas injection system, which can replace futurethe existing urea-selective catalytic reduction (SCR), using low temperature Cu-ZSM-5 catalyst
The 5 wt% VT having V=O bonds that showed stronger sulfur having V–O–V bonds that lost their activity more severely than the former. They summarized resistance, but 5 wt% VT (DT-51) having V–O–V bonds that lost their activity more severely than the former. They summarized that the different vanadium species on the pore structure of TiO2 have a significant effect on the sulfur poisoning during SCR reaction [75]
Summary
Climate change as a result of the promotion of industrialization and urbanization through economic growth around the world has increased awareness of the atmosphere. The SCR catalytic technologies for NOx removal in South Korea and research directions are discussed. The SCR process is one of catalytic reactions, where single mixed metal oxides and supported metal oxides, and pure or metal-exchanged zeolites catalysts are metal oxide, mixed metal oxides and supported metal oxides, and pure or metal-exchanged zeolites generally used to convert nitrogen oxides (NOx ) into nitrogen molecule (N2 ) and water (H2 O), which catalysts are generally used to convert nitrogen oxides (NOx) into nitrogen molecule (N2) and water are harmless to human being and the environment, by using suitable reducing agents (H2O), which are harmless to human being and the environment, by using suitable such as ammonia, urea, hydrocarbon and hydrogen [9].
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