Low-temperature DeNOx catalyst for reducing ultrafine particle emission – BIOENGINEER.ORG

Recently, there is a growing demand for DeNOx catalysts that can treat nitrogen oxides (NOx) at low temperatures, in order to increase energy efficiency when processing flue gases in industrial combustion plants. NOx is emitted during the combustion of fossil fuels and is the leading cause of ultrafine particles (UFP) formed by chemical reactions in the atmosphere.

Recently, there is a growing demand for DeNOx catalysts that can treat nitrogen oxides (NOx) at low temperatures, in order to increase energy efficiency when processing flue gases in industrial combustion plants. NOx is emitted during the combustion of fossil fuels and is the leading cause of ultrafine particles (UFP) formed by chemical reactions in the atmosphere.

However, existing catalysts have a problem of reduced durability due to poisoning of the active sites of the catalyst due to the formation of ammonium sulfate, when sulfur in the flue gas reacts with the reduced ammonia agent at low temperature (

At the Research Center for Extreme Materials, within the Korean Institute of Science and Technology (KIST), the research team of Dr. Kwon, Dong Wook, and Dr. Ha, Heon Phil announced the development of a high-temperature, low-temperature catalyst material for selective catalytic reduction. ); can reduce NOx to water and nitrogen, which are harmless to the environment and the human body.

The team successfully developed a vanadium oxide-based composite catalyst that significantly limited the formation of toxic ammonium sulfate by suppressing the adsorption reaction between the active sites and sulfur dioxide. A catalyst interface engineering technique was used in which molybdenum and antimony oxide were added to the vanadium-based catalyst.

The developed vanadium oxide-based composite catalyst significantly increased the life of the catalyst when exposed to sulfur dioxide at 220 ° C, with a time to achieve 85% initial efficiency of about seven times delayed compared to that of a conventional catalyst. The developed catalyst is also energy efficient due to increased activity at low temperatures, which significantly reduces the NOx treatment load without reheating the exhaust gas. As a result, it is possible to reduce the costs of air pollutant treatment if the developed catalyst is applied to industrial sites in the future.

After completing a laboratory-scale reactor experiment, the team installed a test demonstration plant at Kumho Petrochemical’s 2nd Energy Cogeneration Power Plant for testing using actual flue gas. The KIST-Kumho petrochemical team aims to establish plants in the plant by 2022 after executing the optimal work plan by estimating and checking the plant variables of the demonstration plant over ten months.

Ko, Young Hoon, head of the Kumho Petrochemical R&D center (vice president), said: “Reducing NOx, which makes up most of the harmful substances in the exhaust gases of our cogeneration plant, is a critical issue for Kumho Petrochemical ESG management.” He added: “We are successfully conducting empirical research by installing pilot equipment for power plants to ensure preventive reduction technology above advanced countries, and we plan to conduct an inspection test of the technology to transform it into high-end low-temperature SCR catalytic commercial technology.”

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The Korean Institute of Science and Technology (KIST), established as the first multidisciplinary government-funded research institute in Korea, has established a national science and technology-based development strategy and distributed a variety of essential industrial technologies. Now, half a century later, KIST is raising Korea’s status in science and technology through the world’s leading core technology R&D. Looking to the future, KIST will continue to strive to be a cutting-edge research institute, striving for a brighter future for people.

This research was supported by the Korean Ministry of Science and ICT as KIST institutional R&D projects and the Ultrafine Particle Technology Development Project linked to the Northeast Asia region. The study was published in the ‘Chemical Engineering Journal’


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