电化学法去除SO2/NOX的研究进展

本文对采用电化学方法去除SO2/NOx废气这一新的研究方法进行了综述.在用酞花青钴(CoPc)修饰的碳气体扩散电极上,SO2在空气中的体积百分数在20%以下时可以完全被氧化为硫酸,以连二硫酸盐(S2O2-4)作还原剂,Fe2+-EDTA作络合剂时,NO以90%以上的程度还原为NH+4与NH2(SO3H)等低价含氮化合物,产物中未见N2、N2O与NO2等气体,氧化产物SO2-3(或HSO-3)在Pb阴极上还原再生为S2O2-4.用Ce4+作氧化剂可将SO2/NO2氧化为相应的酸,还原产物Ce3+经电解氧化后循环使用.

ADVANCES IN STUDY OF REMOVALOF SO2/NOX BY ELECTROCHMICAL REDOX

The novel study method used to remove SO 2/NO x waste gases on the basis of electrochemistry has been reviewed in this paper. When mixed with air containing up to 20% by volume SO 2, SO 2 can be 100% oxidized into sulfate acid on carbon gas diffusion electrode modified with cobalt phthalocyanine (CoPc). NO waste gas is, to the extent of 90%, reduced to NH 4 and NH 2(SO 3H), instead of N 2,N 2O et al., using dithionite (S 2O 2- 4) as the redox mediator and Fe 2 -EDTA as the complexing agent. Oxidation product SO 2- 3 or HSO - 3 can be electrochemically reduced into S 2O 2- 4 on Pb cathode. SO 2/NO x can also be oxidized into corresponding acids by Ce 4 , and after the reduction product Ce 3 of Ce 4 is oxidized on a anode, it is sent to the chemical reactor for cycle operation.