摘要
在络合脱硝反应中,Fe(Ⅱ)EDTA络合脱硝液的还原再生是应用难点之一,而甲酸/甲酸钠体系在钯炭(Pd/AC)催化剂作用下对Fe(Ⅱ)EDTA络合脱硝液具有较好的还原性。以此为基础,采用控制变量法,分别考察了超声功率、甲酸添加量、甲酸钠添加量和Pd/AC催化剂添加量对Fe(Ⅱ)EDTA络合脱硝液(脱硝效率为80%)还原再生效果的影响。结果表明,在不开启超声、Pd/AC催化剂作用下,甲酸/甲酸钠还原体系能够有效地还原Fe(Ⅱ)EDTA络合脱硝液中的NO,实现络合脱硝液的还原再生。当甲酸钠添加量为10.00 g/L,甲酸添加量为2.10 g/L,Pd/AC催化剂添加量为3.00 g/L时,得到的再生络合脱硝液在50℃下的脱硝性能最好(在60 min内脱硝效率达97%以上,在90 min内脱硝效率达80%以上)。继续进行多次络合脱硝-还原再生的连续实验,整个体系仍具备较好的脱硝性能(第6次切换时,持续吸收70~80 min的脱硝效率为85%左右)。该研究结果可为络合脱硝连续化的中试试验以及工程应用提供参考。
In the complexation denitrification reaction,the reduction and regeneration of Fe(II)EDTA complexation denitrification solution is one of the application difficulties,and formic acid/sodium formate system has a good reducing property on Fe(II)EDTA complexation denitrification solution under the action of palladium carbon(Pd/AC)catalyst.On this basis,the effects of ultrasonic power,formic acid amount,sodium formate amount and Pd/AC catalyst amount on the reduction and regeneration of Fe(II)EDTA complexation denitrification solution(denitrification efficiency is 80%)were investigated by using control variable method.The results show that under the action of Pd/AC catalyst without ultrasonic,the formic acid/sodium formate reduction system can effectively reduce NO in Fe(II)EDTA complexation denitrification solution,and achieve the reduction and regeneration of the complexation denitrification solution.When the amount of sodium formate is 10.00 g/L,the amount of formate is 2.10 g/L,and the amount of Pd/AC catalyst is 3.00 g/L,the denitrification performance of the regenerated complexation denitrification solution exhibits the best denitrification performance at 50℃(the denitrification efficiency reaches more than 97%within 60 min and the denitrification efficiency reaches more than 80%within 90 min).After several times of continuous complexation denitrification and reduction regeneration experiments,the whole system still has good denitrification performance(at the 6th switching,the denitrification efficiency is about 85%within continuous absorption for 70 min to 80 min).The results can provide reference for the pilot test and engineering application of continuous complexation denitrification.
作者
邓军
张国孟
DENG Jun;ZHANG Guomeng(Changsha Hasky Environmental Protection Science&Technology Development Co.,Ltd.,Changsha 410000,Hunan,China;Shanghai Hengyuan Marine Equipment Co.,Ltd.,Shanghai 201709,China)
出处
《低碳化学与化工》
CAS
北大核心
2024年第2期74-79,共6页
Low-Carbon Chemistry and Chemical Engineering
基金
工业和信息化部高技术船舶科研计划重大工程与专项(CDGC01-KT16)。
关键词
Fe(Ⅱ)EDTA络合脱硝液
还原再生
甲酸/甲酸钠体系
钯炭催化剂
连续化反应
Fe(II)EDTA complexation denitrification solution
reduction regeneration
formic acid/sodium formate system
palladium carbon catalyst
continuous experiment
