以飞灰为载体的金属氧化物催化剂脱硝研究

The selective catalytic reduction of NO by ammonia with fly ash catalyst

以飞灰作为催化剂的载体 ,担载Fe、Cu、V、Ni等过渡金属作为活性成分制成脱硝催化剂 .对飞灰作为载体的催化剂进行了各种表征分析 ,考察了催化剂的制备条件对脱硝效率的影响 .利用固定床反应装置进行了催化脱硝实验研究 ,结果发现 ,飞灰作为脱硝催化剂的载体是可行的 ,其中担载Cu作为活性成分时脱硝效率最好 ,在温度为 2 70℃时NO的转化率达90 %以上 .最后 ,对活性炭和页岩灰作载体时的催化脱硝特性进行了对比研究 ,发现飞灰的催化活性仅次于活性炭 ,而页岩灰的活性最差 .

Selective catalytic reduction (SCR) of NO x with NH 3 by using fly ash catalyst was investigated. The catalytically active elements included Fe, Cu, Ni and V. The results indicated that fly ash, after pre-treating, can be reasonably used as the SCR catalyst carrier. It is possible and feasible to use fly ash catalyst to remove NO from flu gas. Active element Cu gives the highest catalytic activity and NO conversion, compared with Fe, Ni and V. In pre-treating process, the temperature of nitric acid treatment and also the temperature of trying for fly ash particle influence lightly on NO conversion. The calcination temperature is an important factor in the process of the catalyst preparation. Finally, active carbon and shale ash were used as the catalyst carrier to compare with fly ash.