三聚氰胺海绵基高效柔性脱硝催化材料的合成及性能研究

Study on Synthesis and Performance of Melamine Sponge-basedHigh-efficiency Flexible Denitration Catalytic Material

采用两步水热法在三聚氰胺海绵碳泡沫基底(MF)上原位合成MnCo纳米阵列脱硝催化剂用于NH_(3)选择性催化还原NO_(x),并研究了Co改性对Mn-MF低温性能的影响。结果表明:Co改性可以显著提高Mn-MF的低温活性、N_(2)选择性以及抗水抗硫性能;Mn_(2)Co-MF催化剂具有相对最优的低温活性,在140~220℃温度区间内,其脱硝效率可达90%以上。此外,通过SEM、XRD、XPS和H_(2)-TPR、NH_(3)-TPD等不同表征手段探讨了Mn_(2)Co-MF催化剂的催化性能、氧化还原性能和结构之间的关系;Co的引入不仅可以增大催化剂的比表面积和孔容,而且还可以促进Mn_(2)Co-MF催化剂表面氧物种的富集,能够产生更多的酸性位点,提高催化剂的还原性,从而提高其活性。

A two-step hydrothermal method was applied to synthesize the MnCo nanoarray denitration catalyst on carbon foam substrate(MF)for the selective catalytic reduction of NO_(x)by NH_(3).The effect of Co-doping on the low temperature performance of Mn-MF was also studied.The results show that Co-doping can significantly improve the low-temperature activity and selectivity of Mn-MF and the resistance of H_(2)O and SO_(2).The Mn_(2)Co-MF catalyst has the best low-temperature performance and the denitration efficiency can reach more than 90%at 140—220℃.In addition,SEM,XRD,XPS,H_(2)-TPR,NH_(3)-TPD and other characterization techniques are applied to explore the relationship between the catalytic performance,redox performance and structure of Mn_(2)Co-MF catalyst.The results show that the introduction of Co can not only increase the specific surface area and pore volume of the catalyst,but also promote the enrichment of oxygen species on the surface of the Mn_(2)Co-MF catalyst,produce more acid sites,and improve the reducibility of the catalyst,thereby improving the low temperature activity.