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Metallic oxides for dry-type simultaneous removal of SO<SUB>x</SUB> and NO<SUB>x</SUB> were investigated. This process is based on the principle that SO<SUB>x</SUB> can be removed by the sulfation of CuO in metallic oxides, and NO<SUB>x</SUB> removed by the catalytic reduction with NH<SUB>3</SUB> over CuSO<SUB>4</SUB> formed. Therefore, the most important point for the practical use of this process is to develop active metallic oxides, and a method to regenerate repeatedly CuSO<SUB>4</SUB> formed to CuO. Various metallic oxides were prepared by the coprecipitation from different compositions of CuSO<SUB>4</SUB>, Al<SUB>2</SUB> (SO<SUB>4</SUB>) 3, Si (OC2H5) 4, TiCl4 aq. etc. with NH<SUB>3</SUB> aq. The experiments were carried out using a flow type packed bed reactor for the reduction of NO<SUB>x</SUB> or the removal of SO<SUB>x</SUB> and NO<SUB>x</SUB>, and a thermo-balance reactor for the basic study on the removal of SO<SUB>x</SUB> under atmospheric pressure at 350°C . The inlet gas was 1000ppm S-500ppm NO-500, 667ppm NH<SUB>3</SUB>-5% O<SUB>2</SUB>-10% H<SUB>2</SUB>O-N<SUB>2</SUB>. The experiments on the regeneration conditions were carried out by the reduction with NH<SUB>3</SUB>/H<SUB>2</SUB>O mixture, and then the oxidation with O<SUB>2</SUB>/H<SUB>2</SUB>O mixture.<BR>The results obtained are as follows:<BR>1) 30 mol% CuO-20 mol% SiO<SUB>2</SUB>-50 mol % TiO<SUB>2</SUB> was found as the most preferable metallic oxides for the simultaneous removal of SO<SUB>x</SUB> and NO<SUB>x</SUB>, in addition to 40 mol % CuO-20 mol% Al<SUB>2</SUB>O3-40 mol% TiO<SUB>2</SUB> found previously.<BR>2) The suitable regeneration conditions are to reduce from CuSO<SUB>4</SUB> to Cu<SUB>3</SUB>N with 5-20% NH<SUB>3</SUB>-1.5-7.4% H<SUB>2</SUB>O-N<SUB>2</SUB> at 400°C, and then to oxidize from Cu3N to CuO with 5% O<SUB>2</SUB>-0-10% H<SUB>2</SUB>O-N<SUB>2</SUB> at 250 to 350°C.
- 一般社団法人 日本エネルギー学会の論文
一般社団法人 日本エネルギー学会 | 論文
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