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Reduction of nitric oxide over magnesium oxide and dolomite at fludised bed conditions

Artikel i vetenskaplig tidskrift
Författare Birgitta Olanders
Dan Strömberg
Publicerad i Energy and Fuels
Volym 9
Nummer/häfte 4
Sidor 680-684
ISSN 1520-5029
Publiceringsår 1995
Publicerad vid Institutionen för miljövetenskap och kulturvård
Sidor 680-684
Språk en
Länkar pubs.acs.org.ezproxy.ub.gu.se/doi/p...
Ämnesord nitric oxide, reduction, surface, lime, dolomite, carbon monoxide
Ämneskategorier Ytor och mellanytor, Oorganisk kemi, Miljökemi

Sammanfattning

The reduction of nitric oxide over lime and char at fluidized bed conditions has been studied by many authors, but less attention has been paid to other surfaces existing in the boiler. This investigation concerns the reduction of nitric oxide by carbon monoxide, with or without oxygen present, and also the effect of small amounts of water, The reactions were studied in a fixed-bed quartz reactor with quartz, magnesium oxide, magnesium hydroxide, and dolomite as bed materials in the temperature interval 600-950 “C. The residence time and the concentrations of nitric oxide, carbon monoxide, and oxygen were varied. Magnesium oxide formed from heated magnesium hydroxide and calcined dolomite were more active than magnesium oxide of analytical grade, which indicates that the origin of the surface is important for the reaction. The reaction between nitric oxide and carbon monoxide is very sensitive to the presence of oxygen. When oxygen was present the reduction of NO almost ceased. However, if the gases were thoroughly dried, the effect of oxygen addition was not that severe.

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