Lee, Joong Kee Park, Tae-Jin Park, Dalkeun Park, Sunwon 2024-01-21T22:16:10Z 2024-01-21T22:16:10Z 2021-09-02 1993-09 0888-5885 https://pubs.kist.re.kr/handle/201004/145996 Three kinds of char catalysts were prepared by fluidized bed pyrolysis at the temperature range between 500 and 800 °C from lignite, subbituminous, and bituminous coal, and tested for their catalytic activities in the selective catalytic reduction of NO by NH3 at 150 °C. Effects of pyrolysis temperature and oxygen presence in pyrolysis on the catalytic activity of char were investigated. The catalytic activity of NO reduction was found to be closely related to the surface area and the amount of oxygen functional groups. In the experimental range studied, higher catalytic activities were exhibited in accordance with higher surface area and larger amount of oxygen functional groups. The highest catalytic activity was observed in the lignite char and then followed by those of subbituminous and bituminous chars. The amount of oxygen functional groups of char decreased with pyrolysis temperature, while the surface area increased with it. Therefore, the maximum catalytic activity was observed for the char prepared at intermediate pyrolysis temperature of 600-700 °C. English Ammonia Carbon Catalyst activity Coal Fluidized beds Nitrogen oxides Oxygen Pyrolysis Reduction Surface properties Synthesis (chemical) Thermal effects Chars Fluidized bed pyrolysis Nitric oxide Catalysts Catalytic activity of chars prepared by fluidized bed pyrolysis for the reduction of nitric oxide with ammonia Article 10.1021/ie00021a011 1 Industrial and Engineering Chemistry Research, v.32, no.9, pp.1882 - 1887 Industrial and Engineering Chemistry Research 32 9 1882 1887 scopus 2-s2.0-0027662959 Article Ammonia Carbon Catalyst activity Coal Fluidized beds Nitrogen oxides Oxygen Pyrolysis Reduction Surface properties Synthesis (chemical) Thermal effects Chars Fluidized bed pyrolysis Nitric oxide Catalysts catalytic activity fluidized bed pyrolysis SCR deNOx activated char