알루미나에 담지된 플라티늄을 이용한 NOX의 전환반응에 미치는 요인 분석

• 영문명: Analysis of NOX Conversion Reaction using Platinum supported on Alumina
• 발행기관: 한국응용과학기술학회 (구.한국유화학회)
• 저자명: 안범수(Ahn BeomShu)
• 간행물 정보: 『한국응용과학기술학회지』한국유화학회지 제22권 제2호, 168~174쪽, 전체 7쪽
• 주제분류: 공학 > 화학공학
• 파일형태: PDF
• 발행일자: 2005.06.30

영문 초록

Aluminum tri-butoxide was mixed with the water/ethanol solution and then chloroplatinic acid was added to the solution. The solution was dried at 100^{circ}C for 15hrs to remove the solvent and water then it was calcined at 500^{circ}C. The catalyst was activated with a gas mixture. During the activation, the temperature was increased from 150^{circ}C to 500^{circ}C. The necessary amount of urea was dissolved in 50mL water and injected. Aqueous urea solution was then mixed with the feed gas stream. At low temperatures, nitrogen containing compounds of urea decomposition are used as reductants in the reducton of NOX. However at high temperatures the nitrogen containing compounds are oxidized to NO and NO2 by oxygen instead of being used in the reduction. The activity of the catalyst was dependent on urea concentration in the feed stream when there was not adequate water vapor in the feed. The maximum conversion was shifted from 250^{circ}C to 150^{circ}C when water concentration was increased from 2 to 17%. It seems that the maximum temperature shifts to lower temperatures because the hydrolysis rate of HNCO increases with water, resulting in higher amounts of NH3.

키워드

maximum conversion urea decomposition reductant chloroplatinic acid