Development of Dry-Type Simultaneous Removal Process for Sulfur Oxides and Nitrogen Oxides:Selection of CuO-Al<SUB>2</SUB>O<SUB>3</SUB>-TiO<SUB>2</SUB> Coprecipitated Oxides
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A dry method to remove simultaneously SO<SUB>x</SUB> and NO<SUB>x</SUB> with CuO-Al<SUB>2</SUB>O<SUB>3</SUB>-TiO<SUB>2</SUB> was investigated. This method is based on the principle that SO<SUB>x</SUB> can be removed by the sulfation with CuO (SO<SUB>2</SUB>+ (1/2) O<SUB>2</SUB>+CuO-CuSO<SUB>4</SUB>, SO<SUB>3</SUB>+CuO→CuSO<SUB>4</SUB>) and NO<SUB>x</SUB> removed by the catalytic reduction with NH<SUB>3</SUB> (NO+NH<SUB>3</SUB>+ (1/4) O<SUB>2</SUB>→N<SUB>2</SUB>+ (3/2) H<SUB>2</SUB>O, NO<SUB>2</SUB>+ (4/3) NH<SUB>3</SUB>→ (7/6) N<SUB>2</SUB>+2H<SUB>2</SUB>O, NO+NO<SUB>2</SUB>+2NH<SUB>3</SUB>→2N<SUB>2</SUB>+3H<SUB>2</SUB>O) over CuSO<SUB>4</SUB> formed. Thus, the most important problem for practical use of this process is to develop a technique to regenerate repeatedly the-catalyst employed. The experiment for removal of SO<SUB>x</SUB> and NO<SUB>x</SUB> was carried out using a flow type packed bed reactor under atmospheric pressure at 350°C. The inlet gas was 1000ppm SO<SUB>2</SUB>-500ppm NO-667ppm NH<SUB>3</SUB>-5%O<SUB>2</SUB>-10%H<SUB>2</SUB>O-N<SUB>2</SUB>. The metal oxides were prepared by the coprecipitation from CuSO<SUB>4</SUB>, TiCl<SUB>4</SUB> aq. etc. with NH<SUB>3</SUB> aq., The examinations for regeneration were carried out by reduction with NH<SUB>3</SUB>, etc. or by thermal decomposition. The third components added to CuO-TiO<SUB>2</SUB> as an improvement agent were Al<SUB>2</SUB>O<SUB>3</SUB>, SiO<SUB>2</SUB>, Fe<SUB>2</SUB>O<SUB>3</SUB> or V<SUB>2</SUB>O<SUB>5</SUB>. The following results were obtained: 1) 40-50mol%CuO-60-50mol%TiO<SUB>2</SUB> was suitable for only a SO<SUB>x</SUB> absorbents. The regeneration of these solids was possible by mild reduction (CuSO<SUB>4</SUB>→Cu<SUB>3</SUB>N) with NH<SUB>3</SUB>-H<SUB>2</SUB>O mixture (1% NH<SUB>3</SUB>-7.4% H<SUB>2</SUB>O-N<SUB>2</SUB>) at 400°C, and then by mild oxidation (Cu<SUB>3</SUB>N-CuO) with O<SUB>2</SUB>-H<SUB>2</SUB>O mixture (5% O<SUB>2</SUB>-10% H<SUB>2</SUB>O-N<SUB>2</SUB>) at 350°C. 2) 40mol%CuO-20mol% Al<SUB>2</SUB>O<SUB>3</SUB>-40mol% TiO<SUB>2</SUB> was the metal oxides of the most preferable composition for the dry simultaneous removal of SO<SUB>x</SUB> and NO<SUB>x</SUB>. This regeneration was carried out sufficiently by the reduction (CuSO<SUB>4</SUB>→Cu<SUB>3</SUB>N) with 20% NH<SUB>3</SUB>-7.4% H<SUB>2</SUB>O-N<SUB>2</SUB> at 400°C, and then by the oxidation (Cu<SUB>3</SUB>N→CuO) with 5% O<SUB>2</SUB>-10% H<SUB>2</SUB>O-N<SUB>2</SUB> at 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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