【摘要】 采用等体积浸渍法制备了KOH-Au/Al2O3系列催化剂,考察了催化剂对低温CO氧化反应的初始活性和干、湿气氛下连续反应的稳定性能,并用电感耦合等离子发射光谱、红外光谱、高分辨透射电镜、紫外漫反射光谱等技术对催化剂进行了结构表征.结果表明:与母体催化剂(Au/Al2O3)相比,修饰催化剂(KOH-Au/Al2O3)的活性在一定程度上有所降低,但其连续反应的稳定性有所提高,这可能与修饰催化剂预吸附空气中的CO2在催化剂表面形成的碳酸根物种有关.更多还原

【Abstract】 A series of KOH-Au/Al2O3 catalysts were prepared by the incipient wetness impregnation method.The catalysts were characterized by ICP-AES,FTIR,HRTEM,and UV-vis techniques.Their catalytic activity and on-line stability for CO oxidation in dry and wet feed at low temperatures were investigated.The results show that the addition of KOH enhanced the stability at the expense of the catalytic activity,and it is attributled to the pre-formation of carbonate-like species on the catalyst surface from CO2 in air.更多还原