AuPt/AC and Bi modified AuPt/AC were prepared by impregnation using activated granular carbon as support followed by chemical reduction. The catalysts were characterized by means of Atomic Absorption Spectroscopy (AAS), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The catalysts were evaluated in the base free glycerol oxidation at mild reaction conditions in a continuous flow fixed bed reactor. Experimental parameters, such as, contact time (Liquid Hourly Space Velocity: LHSV), temperature and O₂ flow have been varied in order to evaluate catalytic performance in terms of activity, selectivity and long-term stability. Under optimized reaction conditions AuPt/AC showed a high selectivity to glyceric acid (68.3%) whereas Bi-AuPt/AC promoted the oxidation of the secondary alcohol giving a selectivity to dihydroxyacetone (DHA) of 48.1% at 28% conversion, one of the most promising values reported in the current literature. Long-term catalytic performance was carried out for 80 h and revealed a reasonable good stability of AuPt/AC against deactivation and leaching, whereas structural modification and subsequent changes in the catalytic reactivity were envisaged for Bi-AuPt/AC catalyst.

AuPt / AC和Bi改性AuPt / AC的制备方法是：使用活性炭颗粒作为载体进行浸渍，然后进行化学还原。借助原子吸收光谱法（AAS），透射电子显微镜（TEM）和X射线光电子能谱（XPS）对催化剂进行了表征。在连续流固定床反应器中，在温和的反应条件下，在无碱甘油氧化中评估催化剂。实验参数，例如接触时间（液时空速：LHSV），温度和O ₂为了评估活性，选择性和长期稳定性方面的催化性能，已经改变了流量。在优化的反应条件下，AuPt / AC对甘油酸具有很高的选择性（68.3％），而Bi-AuPt / AC可以促进仲醇的氧化，在28％的转化率下，对二羟基丙酮（DHA）的选择性为48.1％，这是其中之一。当前文献中报道的最有希望的价值。进行了80 h的长期催化性能，显示出AuPt / AC具有良好的稳定性，可防止失活和浸出，而Bi-AuPt / AC催化剂的结构改性和随后的催化反应性变化被认为是合理的。