The Research Of DeNOx On Solid State Fuel Cell

It is well known that NOx is major pollution ejected by automobile and factory, which seriously hurts human being’s health. Therefore it has become an urgent issue that how to efficiently remove NO without producing second pollution. NO tends to be directly transferred to N2 and O2 by chemical reaction from thermal theories, while it needs to overcome little bit larger energy from kinetics analysis. Therefore, some catalysts should be used on desorption of NO. Nowadays, traditional DeNOx technologies are facing three part of challenge. Firstly, how to reduce the use of noble metal because of high cost. Secondly, how to extend working hours of catalyst by protecting it from poisoning. Thirdly, how to reduce the working temperature. So we need a new kind of catalytic system to effectively clean fuel gas under lean-burn condition.Solid Oxide Fuel Cell (SOFC) is one kind of new energy cell device which can directly transfer the original chemistry energy to electronic energy. It is compatible in use because of several advantages, such as high efficiency of energy transformation, low pollution, simple constructions and wide applications. Nowadays, the working temperature of SOFC can be reduced to 700-800℃, the manufacture cost can be reduced by a wide margin, the stability of using can be highly improved and the application area can be largely widened. Furthermore, SOFC is being researched on DeNOx as a new catalyst and has been well reported on DeNOx under lean-burn condition. SOFC system reported was deleted current collecting parts on Cathode and doesn’t consume any reductant because of no current circuit. As the SOFC DeNOx system is simply constructed, it is likely to be widely used in lean-burn automobile. We prepared SOFC anode composite material by type casting, prepared anode functional layer and electrolyte by wet powder spraying and prepared cathode composite by silk-screen printing. The complete SOFC structure is constructed with Ni-YSZ/YSZ/LSM-YSZ/LSM. This thesis will discuss the influence of YSZ ball-milling method and speed on powder particle size and the influence of powder particle size on the compactness of electrolyte. In the end, we come to a conclusion that high energy ball-milling and high speed can improve the compactness of YSZ. We establish a DeNOx test platform by constructing the NO detector with SOFC system on high temperature furnace, where we put the complete structure of SOFC system as experimental group and Al2O3+LSM-YSZ/LSM as control group. H2 is piped onto anode surface, and NO-N2 carrier gas is piped onto cathode surface. We found that LSM itself has a certain DeNOx performance while the complete cell structure of SOFC can greatly improve this performance. Apart from this, NO conversion rate is influenced by temperature, NO gas flow rate, reducing time of anode and closed environment. Furthermore, we prepared three different kind of cathode materials bysilk-screen printing. They are LSM-YSZ, LSM and LSCF-YSZ. We found that the capacity of cathode material’s NO desorption on SOFC catalytic system can be greatly modified by temperature changing. LSM has superior DeNOx capacity other than LSCF-YSZ on 700℃. while LSCF-YSZ is better performed than LSM on 400℃.